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Time-resolved optical assessment of exciton formation in mixed two-dimensional perovskite films

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arxiv 2406.03876 v1 pith:RUAGZKJO submitted 2024-06-06 physics.optics cond-mat.mes-hall

Zheng Zhang , Jianan Wang , Yijie Shi , Xi Wang , Zhong Wang , Xiangyu Zhu , Chunlong Hu , Zonghao Liu
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Wei Chen Wenxi Liang
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classification physics.opticscond-mat.mes-hall
keywords excitontwo-dimensionalcarriersenergyformationmixedableabove
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We report the observation of exciton formation from the cooled band-edge carriers in mixed two-dimensional hybrid organic-inorganic perovskites using femtosecond transient absorption spectroscopy. By monitoring the changes of bleach signal upon excitations with various photon energy, we are able to extract the values of exciton binding energy and the occupancies of carriers of free and bound states for each two-dimensional phase. We also confirm the existence of Mahan exciton when injected carrier density is above the Mott criterion.

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