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Compositional and Interface Engineering of Hybrid Metal Halide Perovskite Thin Films for Solar Cells

T0 review · 2 major / 5 minor · reviewed 2026-08-12 · deepseek-v4-flash

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Pith's one-line read This thesis claims that mixing the self-assembled monolayer Me-4PACz with the conjugated polyelectrolyte PFN-Br at a 9:1 ratio fixes the hydrophobicity of the SAM hole-transport layer, yielding inverted perovskite solar cells with…

desk verdict A transparent thesis compiling already-published work: the 9:1 SAM/polymer HTL and recombination benchmarks are solid, but the TPV differential-lifetime factor and capacitance correction need explicit treatment before the radiative-limit numbers are trusted. read the letter →

arxiv 2411.17919 v1 pith:3OZZ2ZDJ submitted 2024-11-26 cond-mat.mtrl-sci physics.app-ph

Kashimul Hossain This is my paper · ORCID
classification cond-mat.mtrl-sciphysics.app-ph
keywords perovskitesolarcellsself-assembledmonolayerMe-4PACzPFN-Brholetransportlayerbimolecularrecombinationradiativelimittandem
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This thesis argues that the buried hole-transport/perovskite interface, not the perovskite bulk alone, is what limits reproducible inverted perovskite solar cells, and that mixing the self-assembled monolayer Me-4PACz with the conjugated polyelectrolyte PFN-Br at a 9:1 ratio removes the dominant interfacial problem. The author reports that this 9:1 mixed hole-transport layer gives stabilized efficiencies above 20%, the lowest dark current among the ratios tested, and an ideality factor close to unity. The thesis then treats the unity ideality factor as evidence that the cell operates near the radiative limit, and develops a steady-state and transient characterization scheme, built on the benchmark $\tau^{-1} = k_1 + k_2 n$, to extract the recombination coefficients. If correct, the result matters because it offers a reproducible, low-temperature route to efficient inverted cells, and a quantitative way to tell how close any perovskite cell is to its radiative limit.

What carries the argument

The central object is the mixed hole-transport layer Me-4PACz:PFN-Br at a 9:1 volume ratio: a self-assembled monolayer blended with a conjugated polyelectrolyte, which resolves the wetting failure of the neat SAM and shifts the work function of the contact. The quantitative machinery is the benchmark recombination equation $\tau^{-1} = k_1 + k_2 n$, where $\tau$ is the capacitance-corrected transient photovoltage decay time, $n$ the carrier density, $k_1$ the monomolecular (trap-assisted) recombination coefficient and $k_2$ the bimolecular coefficient. The thesis uses this equation, together with intensity-dependent open-circuit voltage and Suns-VOC pseudo J-V curves, to extract $k_1$ and $k_2$ and to argue that bimolecular recombination dominates, which is what puts the ideality factor — the diode-quality parameter whose unity value marks radiative-like recombination — close to unity.

What would settle it

Repeat the transient photovoltage measurement on the same 9:1 devices while determining the RC time constant independently by impedance spectroscopy, and check whether the corrected decay gives a straight line for $\tau^{-1}$ versus photogenerated carrier density with the reported intercept $k_1$ and slope $k_2$. If the extracted lifetime changes with the capacitance-correction method, or if the $\tau^{-1}$-versus-$n$ curve bends, the claim that the cell is dominated by bimolecular recombination and operates near the radiative limit fails. A second check is to measure absolute electroluminescence quantum efficiency and compare the implied radiative $k_{2,\mathrm{rad}}$ with the $k_2$ extracted from transient photovoltage.

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Extended reading notes

Core claim

The thesis sets out to show that the buried interface in inverted perovskite solar cells can be fixed by mixing the self-assembled monolayer Me-4PACz with the conjugated polyelectrolyte PFN-Br. At a 9:1 volume ratio the mixed layer wets the perovskite precursor, tailors the work function, and produces cells with stabilized efficiency above 20%, the lowest dark current of all ratios tested, and an ideality factor close to unity. The author reads the unity ideality factor as the signature of a device operating near the radiative limit, and supports this by showing that transient photovoltage lifetimes follow the benchmark $\tau^{-1} = k_1 + k_2 n$, with bimolecular recombination dominating. The same devices yield dark-current and Suns-VOC estimates of reverse saturation current density that agree with each other, and the mixed hole-transport layer is carried through to semi-transparent cells, four-terminal tandems with silicon and CdTe, and scalable photodetectors.

Load-bearing premise

The argument rests on the assumption that the measured speed of the voltage drop after a light pulse, once corrected for the device's electrical charging time, equals the true lifetime of charges in the perovskite and obeys $\tau^{-1} = k_1 + k_2 n$; if that capacitance correction is incomplete, or if trap-assisted recombination has a different intensity dependence, the extracted recombination coefficients and the radiative-limit conclusion do not follow.

Editorial extensions

If this is right

  • This mixed 9:1 Me-4PACz:PFN-Br hole-transport layer yields reproducible inverted perovskite solar cells with stabilized efficiency above 20% at both 0.175 cm² and 0.805 cm² active areas.
  • Devices built with this layer show the lowest dark current and an ideality factor of about 1.05, which the thesis reads as dominance of bimolecular recombination and proximity to the radiative limit.
  • The characterization scheme predicts reverse saturation current density from dark J-V and from Suns-VOC pseudo J-V, and the two predictions agree with experiment.
  • The same mixed layer supports semi-transparent cells with an IZO electrode and four-terminal tandems with silicon and CdTe solar cells, and it gives low dark current in scalable perovskite photodetectors.
  • Unencapsulated 9:1 devices show stable J-V parameters over more than 3000 hours at about 40% relative humidity and survive repeated 85 °C thermal cycling.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The same mixing-ratio strategy could be applied to other carbazole-based SAMs such as 2PACz and MeO-2PACz; a testable prediction is that the optimal polymer fraction shifts with the SAM's molecular dipole and hydrophobicity.
  • The near-unity ideality factor alone does not prove the radiative limit; an independent cross-check would be comparing the non-radiative voltage loss implied by electroluminescence quantum efficiency with the loss implied by the thesis's extracted recombination coefficients.
  • The capacitance-corrected transient photovoltage benchmark could serve as a standard diagnostic for other perovskite compositions and device architectures, with the bimolecular coefficient from transient photovoltage compared against the radiative bimolecular coefficient from photoluminescence quantum yield.
  • The semi-transparent IZO devices point toward monolithic or three-terminal tandems if the transparent top-contact stack can be made compatible with the processing of the second subcell.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

2 major / 5 minor

Summary. This PhD-thesis manuscript reports compositional and interface engineering of p-i-n perovskite solar cells, centered on a mixed Me-4PACz:PFN-Br hole transport layer at a 9:1 volume ratio. The central claim is that this 9:1 HTL gives reproducible stabilized efficiency above 20%, the lowest dark current among the studied ratios, an ideality factor close to unity, and recombination dominated by bimolecular processes, placing the device near the radiative limit. The thesis also contains chapters on dielectric relaxation in A-cation-engineered perovskites, semi-transparent cells and 4-terminal tandems with Si and CdTe, and scalable perovskite photodetectors. The radiative-limit conclusion rests on Chapter 6, where k1 and k2 are extracted from intensity-dependent transient photovoltage decays and used to predict J0 values that are compared with dark current and Suns-VOC measurements.

Significance. If the central claim is correct, the 9:1 mixed HTL is a simple and practically useful interface strategy, and the Chapter 6 characterization scheme would provide a self-contained route to quantify how close a perovskite cell is to radiative-limited operation. The manuscript has genuine strengths: device statistics over 30 cells, MPP tracking for the >20% claim, a comparison of J0 extracted from dark J-V and Suns-VOC, QEEL measurements, and consistency checks against benchmark scaling laws. I agree with the reader that the validation of J0 is not circular by construction, because the TPV-extracted k1 and k2 are compared with independently measured dark-current and Suns-VOC values. The main weakness is not circularity but the incomplete documentation of the TPV capacitance correction and of the relation between the measured transient lifetime and the recombination rate model; these issues directly affect the numerical values of k1, k2, and the derived radiative-limit analysis.

major comments (2)
  1. [Section 6.3.5, Eq. (6.5c) and Figure 10(b)] Eq. (6.5c) is written as tau^-1 = k1 + k2 n, which is the total carrier lifetime n/R under the ABC model. A small-perturbation TPV transient measures the differential lifetime (dR/dn)^-1 = (k1 + 2 k2 n + 3 k3 n^2)^-1 unless an explicit conversion is supplied. The manuscript does not state which of these two quantities is obtained from the TPV decays or how the factor of 2 (and 3) is removed. If the slope of tau^-1 versus n, or versus I0 when I0 is taken proportional to n, is identified directly with k2, the extracted bimolecular coefficient and all derived quantities in Table 5 and Figures 12 and 13 are off by a factor of two. The reduction from the measured transient to Eq. (6.5c) must be given explicitly.
  2. [Section 6.3.6, Figure 7 (Chapter 6 numbering)] The capacitance correction for the TPV lifetime is described only in words and in a schematic plot (red: measured; black: capacitance effect; blue: corrected); no formula, component values, fitting procedure, or error analysis is provided. Without these details it is impossible to rule out a systematic bias in tau whenever the device RC time constant is comparable to the recombination lifetime at any background intensity, and such a bias would enter the intercept k1 and the slope k2 of Eq. (6.5c) differently at different light levels. Please add the deconvolution equation, the extracted RC parameters, and an independent validation, for example on devices with different capacitance or using an explicit equivalent-circuit fit.
minor comments (5)
  1. [Abstract and Chapter 5] The abstract claims 'the lowest dark current' without a quantitative baseline; give the dark current density of the 9:1 device and of the reference devices so the claim can be evaluated.
  2. [Chapter 5, Figure 10(a) and Table 3] The figure caption states the forward scan direction while the inset is described as MPP tracking with a stabilized efficiency of 20.14%; specify whether the quoted PCE is from the forward or reverse scan and how the stabilized value is obtained.
  3. [Chapter 6, Figure 9(a)] The ideality factor is quoted as 1.05, but the text does not state the voltage or intensity range of the linear fit; provide this information so the reader can assess the fit quality.
  4. [Chapter 6, Table 5] The J0 values from dark J-V, Suns-VOC, and the TPV-based recombination parameters are given as point values without uncertainty ranges; report fit uncertainties so the agreement between the independent estimates can be judged.
  5. [Chapter 6, Figure 6] The perturbation laser intensity is stated as 10 mW, but the corresponding generation rate or injection level is not converted into an equivalent solar intensity; stating this would make the tau^-1 versus I0 comparison quantitative.

Circularity Check

1 steps flagged · score 6.0 of 10

The J0 'prediction' from TPV-extracted k2 and ni is algebraically identical to the Suns-VOC J0, so the stated validation is a model identity; independent content remains from dark J-V and EL measurements.

  1. self definitional [Chapter 6, Table 5 caption, §6.3.7–6.3.8, Figure 9a, Figure 10b]
    "The reverse saturation current density J0 (mA/cm2) and the ideality factor calculated from the dark current, Suns- VOC measurement and compared it with the estimates for trap assisted (SRH) and bimolecular recombination using Jdark, SRH = qk1niWeqV2kT and Jdark, BB = qk2ni2WeqVkT respectively."

    Jdark,BB = qW k2 ni^2 is presented as a predicted J0 and compared with the J0 from Suns-VOC. But ni is back-extracted from intensity-dependent VOC using the same Boltzmann/diode relation VOC = (kT/q)ln(n^2/ni^2), and k2 is extracted from transient data under the same steady-state balance JSC = qW(k1 n + k2 n^2). Substituting gives JSC = qW k2 ni^2 exp(qVOC/kT), so J0,sv = JSC exp(-qVOC/kT) = qW k2 ni^2 = Jdark,BB. The predicted bimolecular J0 is thus the Suns-VOC J0 by algebraic construction; agreement is guaranteed by the model equations. The dark-current J0 is an independent measurement, but the Suns-VOC branch reduces to an identity.

full rationale

The central derivation in Chapter 6 is mostly self-contained: k1, k2 and ni are extracted from transient photovoltage and intensity-dependent VOC, and the resulting J0 is compared with dark-current and Suns-VOC J0. However, for the Suns-VOC branch the comparison is not an independent test. With the stated benchmark equations (eq. 6.5, Table 5), the bimolecular reverse-saturation current Jdark,BB = qW k2 ni^2 follows from JSC = qW k2 n^2 and n = ni exp(qVOC/2kT), which together force Jdark,BB = JSC exp(-qVOC/kT), i.e. exactly the J0 extracted from Suns-VOC. Thus the 'prediction' is a mathematical identity, not an experimental confirmation. The dark-current J0 comparison does provide independent evidence, and the EL-derived k2,rad and achievable-limit calculations add separate content, so the circularity is partial. The flagged TPV capacitance-correction and differential-lifetime issues are correctness/validation risks rather than circularity and are not scored as circular steps here.

Assumptions & free parameters 5 free parameters · 5 assumptions · 0 invented entities

The central claims rest on a handful of measured or fitted parameters (k1, k2, ni, ideality factor, J0), on the validity of the cited DFT and energy-level inputs, and on the photophysical assumption that TPV lifetimes, after RC correction, directly report bulk recombination. No new physical entities are introduced. The thesis pulls most of its experimental evidence from its own prior publications rather than from independent external benchmarks.

free parameters (5)
  • k1 (monomolecular recombination coefficient) = ~1e4 s^-1 (from Figure 13 caption)
    Extracted from the intercept of the TPV-derived tau^-1 vs I0 plot (Chapter 6, Figure 10b); used in calculating Jdark, SRH and the achievable limits. No uncertainty given.
  • k2 (bimolecular recombination coefficient) = ~1e-10 cm^3/s
    Extracted from the slope of tau^-1 vs I0; the central evidence for bimolecular-dominated operation.
  • ni (intrinsic carrier density) = 0.5e6 cm^-3
    Input value used in achievable-limit calculations (Figure 13 caption); origin not derived in thesis; if different, voltage-loss estimates change.
  • Diode ideality factor n = ~1.05 (Ch.6), near 1 (Ch.5)
    Obtained by fitting intensity-dependent VOC and dark J-V; the 'near radiative limit' claim rests on this fit.
  • Reverse saturation current density J0 = listed in Tables 5-8 (Chapter 6); exact values not fully visible
    Extracted from dark J-V and Suns-VOC diode fits and used as the experimental benchmark for the model.
assumptions (5)
  • domain assumption Single-diode / Shockley equation model with constant ideality factor describes the device J-V in the relevant bias range.
    Invoked throughout Chapters 2, 5, 6 for extracting J0, n, series resistance; does not account for bias-dependent recombination or ionic effects.
  • domain assumption Carrier recombination is fully captured by the rate equation dn/dt = G - k1 n - k2 n^2 - k3 n^3 with negligible Auger (k3=0) over the studied intensity range.
    Defines the benchmark equations (eq. 6.5) in Chapter 6; if trap-assisted recombination has a different intensity scaling, the linear fits in Figure 10b are not meaningful.
  • domain assumption The TPV decay time, after correcting for capacitance, equals the small-perturbation recombination lifetime.
    Core to the extraction of k1 and k2 in Chapter 6 (Figure 7); stated but not proven, and the correction factor is described qualitatively.
  • domain assumption DFT defect/stability correlations (hydrogen bonding in FA-containing triple-cation perovskites) from cited literature are correct.
    Used in Chapter 4 to connect dielectric relaxation to defect density and stability; the thesis performs no new first-principles calculations.
  • domain assumption Work function and energy level inputs for ITO, SAMs, perovskite, PCBM, BCP, Ag/IZO taken from literature are accurate for the fabricated stacks.
    Used in band diagrams (Chapter 4 Figure 1b, Chapter 5) and in device-physics interpretation.

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Pith. "Pith review of Compositional and Interface Engineering of Hybrid Metal Halide Perovskite Thin Films for Solar Cells." pith.science (2026). https://pith.science/paper/3OZZ2ZDJ

@misc{pith2026241117919,
  author       = {Pith},
  title        = {Pith review of: Compositional and Interface Engineering of Hybrid Metal Halide Perovskite Thin Films for Solar Cells},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/3OZZ2ZDJ}},
  note         = {Machine review of arXiv:2411.17919}
}
read the original abstract

Perovskite solar cells (PSCs) are the fastest-growing photovoltaic (PV) technology in the solar cell community and have reached an efficiency close to that of commercial silicon (Si) solar cells. The organic-inorganic halide perovskite solar cell is an emerging PV technology and grabbed much attention due to its low cost, high efficiency, and ease of fabrication at lower temperatures 100-200 C by solution-processed spin coating or thermal evaporation techniques. Further, we introduce a self-assembled monolayer (SAM) based hole transport layer (HTL) in the p-i-n device architecture PSC. In this work, we used the mixing engineering strategy of SAM with a conjugated polyelectrolyte. We dealt with the hydrophobicity and tailored the work function of the mixed SAM based HTL. Therefore, the HTL/perovskite interface is engineered, and associated device physics is discussed. In addition, we observed the lowest dark current for specific mixed (9:1) HTL, which is a prerequisite in photodetector applications. Therefore, a detailed photodetection analysis is discussed to study the scalable photodetector device. This thesis thoroughly studies perovskite compositional and interface engineering via various optoelectronic measurements. An in-depth device physics is discussed to study the interfacial defects between the charge transport and the perovskite layers. This thesis will be helpful in exploring a new class of perovskite materials and interface modification engineering for fabricating reproducible, stable, and highly efficient hybrid organic-inorganic metal halide perovskite solar cells.

Figures

Figures reproduced from arXiv: 2411.17919 by the authors.

Figure 1
Figure 1. (a) Pie chart of all mixed energy generation worldwide.2 (b) Pie chart of likely worldwide renewable energy generation.2 (c) Share of power capacity in the upcoming future.3 1 [PITH_FULL_IMAGE:figures/full_fig_p014_1.png] view at source ↗
Figure 17
Figure 17. Photovoltaic (PV) parameters as a function of device active area for the highest efficiency reported perovskite solar cells (PSCs).102,103,135–137 (b) 1-cm2 active area n-i-p architecture based PSC with the conventional electrode (left) and U-shaped new electrode design (right) . (adapted from ref. 130). (c) Left images indicate the simulated series resistance distribution for 10 × 10 mm2 active area device (red das… view at source ↗
Figure 18
Figure 18. (a) Left panel represents the simulated series resistance distributions for 10 × 10 mm2 , 6 × 17 mm2 , and 4 × 25 mm2 devices using electrode designs with different geometries. The right panel shows the simulated (solid line) and measured (dashed line) J − V curves of devices using new electrode designs with different geometries. (adapted from ref.130 ). (b) Rectangular device active area of 0.948 cm2 with one side … view at source ↗
Figures from the paper (34 more)
Figure 1
Figure 1. Figure 1: Steps involved in pattering the ITO substrates. The 60 mm × 60 mm ITO-coated glass substrate was cut in 60 mm × 15 mm i.e. 4 pieces (step -1). Then, place a 12 mm width thermal tap on one side (step-2). After that, put zinc paste on the open area (step-3). Drop HCl to …
Figure 2
Figure 2. Figure 2: The schematic diagram of the p-i-n (inverted) architecture-based perovskite solar cells. 74 [PITH_FULL_IMAGE:figures/full_fig_p016_2.png]
Figure 7
Figure 7. Figure 7: Schematic of the PLQY measurement in three steps. The term ‘L’ represents laser spectra and ‘E’ for emission spectra. 80 [PITH_FULL_IMAGE:figures/full_fig_p017_7.png]
Figure 2
Figure 2. Figure 2: (a) Normalized XRD pattern of (FA1-XMAX)0.95Cs0.05PbI3 perovskite films where X= 0.00, 0.25, 0.50, 0.75, and 1.00. (b) Peak position of (110) plane of (FA1- XMAX)0.95Cs0.05PbI3 perovskite films. (c) the shift of (110) peak in 2θ degree with respect to X composition. 10…
Figure 4
Figure 4. Figure 4: (a) Illuminated J-V characteristics and (b) in-phase part of the frequency dependent photocurrent of the (FA1-XMAX)0.95Cs0.05PbI3 PSCs, where X= 0.00, 0.25, 0.50, 0.75, and 1.00. 111 [PITH_FULL_IMAGE:figures/full_fig_p018_4.png]
Figure 8
Figure 8. Figure 8: (a) Absorption and PL spectra of MAPI and CsFAMA perovskite films. (b) Dark J-V characteristics of MAPI and CsFAMA PSCs. (c) Built-in potential of MAPI and CsFAMA based PSCs. (d) Conductivity of MAPI and CsFAMA based PSCs. 115 [PITH_FULL_IMAGE:figures/full_fig_p018_8.png]
Figure 11
Figure 11. Figure 11: (a) Time-resolved photoluminescence (TRPL) decay profile of MAPI and CsFAMA perovskite films, solid line is bi-exponential fit to the experimental data. (b) Intensity dependent VOC of MAPI and CsFAMA PSCs, the solid line fits the Shockley diode equation.55 (c) Transie…
Figure 1
Figure 1. Figure 1: Schematic of the thin film deposition of the Me-4PACz, Me:4PACz:PFN-Br (abbreviated as Pz:PFN), and perovskite layer. (a) Me-4PACz and perovskite layer deposition. (b) Deposition of mixed Me-4PACz:PFN-Br and perovskite layers. 142 [PITH_FULL_IMAGE:figures/full_fig_p01…
Figure 3
Figure 3. Figure 3: Photographic image showing non-uniform perovskite thin film being deposited on methanol washed ITO/Me-4PACz substrate. 144 [PITH_FULL_IMAGE:figures/full_fig_p019_3.png]
Figure 11
Figure 11. Figure 11: (a) J − V characteristics of the photovoltaic devices under 1-Sun (100 mW/cm2 ) condition in the forward and reverse scan direction for 0.805 cm2 active area (11.5 mm x 7 mm) PSC device. The inset figure represents the PSC of active area 0.805 cm2 . (b) J − V characte…
Figure 12
Figure 12. Figure 12: (a) EQE/IQE & reflectance (R) spectra and (b) EQE & integrated JSC of PSC devices employing different mixing ratios of Pz:PFN HTLs. 152 [PITH_FULL_IMAGE:figures/full_fig_p020_12.png]
Figure 20
Figure 20. Figure 20: (a) The KPFM scanning image of a standard gold (Au) sample deposited on ITO substrate. (b) KPFM scanning image of perovskite film deposited on the ITO substrate. The work function of the Pz:PFN HTL at two different locations and the average of them are listed in Table…
Figure 21
Figure 21. Figure 21: (a) Work function of Me-4PACz without and with PFN-Br interlayer and with different Pz:PFN mixing ratios, perovskite, PFN-Br, ITO, and Au metal electrode measured using KPFM. (b) The valence band maximum and the Fermi-level of the Me-4PACz and PFN-Br mixed HTLs are me…
Figure 28
Figure 28. Figure 28: The plots represent the pseudo J − V (solid point) measured from Suns-VOC and real J − V (half solid points) at the 1-Sun condition for the Pz:PFN HTL based PSCs of (a) Pz:PFN (6:4), (b) Pz:PFN (7:3), (c) Pz:PFN (8:2), (d) Pz:PFN (9:1), and (e) Pz:PFN (9.5:0.5).62 173…
Figure 30
Figure 30. Figure 30: (a) The electroluminescence quantum efficiency (QEEL) is a function of injected current density and the inset represents the digital image of the device during a 5 mA injected current. (b) The QEEL at the injected JSC of the representative PSCs. 176 [PITH_FULL_IMAGE:…
Figure 2
Figure 2. Figure 2: (a) The steady state efficiency at maximum power point tracking under 1-Sun condition for 0.175 cm2 active area PSC. (b) EQE, IQE spectrum with reflection spectra (R), and the integrated current densities (Int. JSC) over the AM 1.5G for 0.805 cm2 PSC. 201 [PITH_FULL_I…
Figure 4
Figure 4. Figure 4: (a) Schematic of the experimental set-up of steady-state Current vs. Voltage characteristics measurement at different intensities. (b) Current density vs. Voltage (J − V) characteristics of the photovoltaic devices under varied illumination conditions. The intensity of…
Figure 13
Figure 13. Figure 13: (a) AM 1.5G spectrum is taken from the PV lighthouse, which is used to calculate the integrated current density over the EQE spectrum of the PSCs.65 (b) The ideal EQE spectrum (no loss) i.e. 100% EQE is considered, and the corresponding integrated JSC is calculated fo…
Figure 1
Figure 1. Figure 1: Schematic representation of the working principle of tandem solar cells. (a) Schematic representation of below bandgap loss and thermalization loss. (b) Silicon solar cells have lower below bandgap loss and higher thermalization loss. (c) Perovskite solar cells have hi…
Figure 2
Figure 2. Figure 2: (a) Schematic of semi-transparent PSC. Glass/ITO is the transparent conductive electrode, Pz:PFN (9:1) is the hole transport layer, perovskite is the active material, PCBM/BCP acts as the electron transport layer, ALD SnO2 acts as an electrons transport as well as sput…
Figure 2
Figure 2. Figure 2: Energy level band diagram of the p-i-n architecture-based perovskite photodetector (PPD). The energy level values are taken from the literature.51–53 285 [PITH_FULL_IMAGE:figures/full_fig_p026_2.png]
Figure 6
Figure 6. Figure 6: The absorption coefficient of the triple cation perovskite (FA0.83MA0.17)0.95Cs0.05Pb(I0.83Br0.17)3 abbreviated as CsFAMA film deposited on a glass substrate. 288 [PITH_FULL_IMAGE:figures/full_fig_p026_6.png]
Figure 9
Figure 9. Figure 9: (a) Dark current vs. voltage (I − V) characteristics for PTAA and Me-4PACz HTL-based PPD. (b) Dark current density vs. voltage (J − V) characteristics for PTAA and Me-4PACz HTL-based PPD. 291 [PITH_FULL_IMAGE:figures/full_fig_p026_9.png]
Figure 29
Figure 29. Figure 29 [PITH_FULL_IMAGE:figures/full_fig_p030_29.png]
Figure 5
Figure 5. Figure 5: c the red dotted line represents the 𝑉𝑂𝐶 of the solar cell and is equal to the bandgap of the absorber when there is no recombination, but due to radiative recombination it is lower represented by the black solid line [PITH_FULL_IMAGE:figures/full_fig_p059_5.png]
Figure 4
Figure 4. Figure 4: Schematic diagram of the absorption spectroscopy measurement using Perkin Elmer Lambda 950 spectrometer. The absorbance of the thin film can be expressed by Beer Lambert’s law as, 𝐴(𝜆) = − log ( 𝐼 𝐼0 ) (3.1) Where 𝐼0 and 𝐼 indicate the intensities of the incident and t…
Figure 13
Figure 13. Figure 13: Energy level band diagram of the p-i-n architecture based perovskite solar cell where PTAA and Me-4PACz SAM are used as HTLs and CsFAMA perovskite (bandgap 1.6 eV) as an absorber. The energy level values are taken from the literature.68–70 [PITH_FULL_IMAGE:figures/fu…
Figure 19
Figure 19. Figure 19 [PITH_FULL_IMAGE:figures/full_fig_p192_19.png]
Figure 22
Figure 22. Figure 22: The built-in potential (𝑉𝑏𝑖) is estimated from the dark current-voltage characteristics for the diode of ITO/Pz:PFN(X:Y)/Perovskite/PCBM/BCP/Ag. dark current characteristics of diodes show a clear trend in reduced barrier-voltage for the case of Pz:PFN (9:1) compositi…
Figure 26
Figure 26. Figure 26: The legends ND 0.0, 0.1, 0.2, 0.3, and so on indicate that the 1-Sun light is falling on the device through different ND filters of optical density ND 0.0, 0.1, 0.2, 0.3, and so on. The ND 0.0 indicates that there is no ND filter i.e. zero optical density and in that …
Figure 29
Figure 29. Figure 29 [PITH_FULL_IMAGE:figures/full_fig_p208_29.png]
Figure 32
Figure 32. Figure 32 [PITH_FULL_IMAGE:figures/full_fig_p215_32.png]
Figure 9
Figure 9. Figure 9: 6.3.9 Analysis of the achievable limits (ALs) The SQ limit parameters59,60 (i.e., with only radiative recombination), for a solar cell with a band gap ~1.6 𝑒𝑉 and thickness 𝑊 ≈ 500 nm are h ≈ 30%, 𝐽𝑆𝐶,𝑆𝑄 ≈ 26 mA/cm2 , 𝑉𝑂𝐶,𝑆𝑄 ≈ 1.3 V, 𝐹𝐹𝑆𝑄 ≈ 90%. The recombination limit…
Figure 18
Figure 18. Figure 18 [PITH_FULL_IMAGE:figures/full_fig_p334_18.png]

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Reviewed August 12, 2026 · model on record in the stance chip above.