{"paper":{"title":"Exploring the Potential of Ternary Blending for Two and Three-Junction RAINBOW Solar Cells","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Ternary blending in side-by-side RAINBOW solar cells raises efficiency from 12.9% in single-junction devices to 17.3% in three-junction devices.","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Albert Harillo-Ba\\~nos, Alejandro R. Go\\~ni, Francesc Xavier Capella-Guardi\\`a, Jaime Mart\\'in, Jenny Nelson, Jolanda Simone M\\\"uller, Mariano Campoy-Quiles, Miquel Casademont-Vi\\~nas, Muhammad Ahsan Saeed, Xabier Rodr\\'iguez-Mart\\'inez","submitted_at":"2026-05-07T15:47:27Z","abstract_excerpt":"The efficiency of organic photovoltaics (OPV) has been steadily increasing over the past decade until reaching the 20\\% milestone. Multijunction architectures provide a promising approach to further enhance performance. Here we explore the potential of a spectral splitting geometry, referred to as RAINBOW, in which subcells are placed side-by-side and externally connected, thus minimizing the fabrication and current matching challenges found in vertically stacked configurations. First, we tested 7 different binaries with bandgaps spanning from 1.98 to 1.16 eV. The systems with the widest and n"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"The efficiency improves from 12.9% in single-junction devices to 15.9% in 2-junction devices (16.4% in simulations) and 17.3% in 3-junction devices (17.7% in simulations), confirming the viability of the RAINBOW architecture for scalable, high-efficiency OPVs.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That ternary mixing tunes Voc and boosts PCE in the target spectral region when morphology and energy levels are well aligned, as illustrated for PTB7-Th:COTIC-4F:BTP-eC9 operating as the red subcell.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Ternary blends in RAINBOW side-by-side organic solar cells raise efficiency from 12.9% single-junction to 15.9% for two junctions and 17.3% for three junctions using blade coating.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Ternary blending in side-by-side RAINBOW solar cells raises efficiency from 12.9% in single-junction devices to 17.3% in three-junction devices.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"95bf84db47cf73d382f127e7f4cc8b0395435aafd7c83b921e1241a1452d5c73"},"source":{"id":"2605.07718","kind":"arxiv","version":2},"verdict":{"id":"0be57595-c77d-41aa-a0df-35d11f5b238d","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-11T03:31:09.549343Z","strongest_claim":"The efficiency improves from 12.9% in single-junction devices to 15.9% in 2-junction devices (16.4% in simulations) and 17.3% in 3-junction devices (17.7% in simulations), confirming the viability of the RAINBOW architecture for scalable, high-efficiency OPVs.","one_line_summary":"Ternary blends in RAINBOW side-by-side organic solar cells raise efficiency from 12.9% single-junction to 15.9% for two junctions and 17.3% for three junctions using blade coating.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That ternary mixing tunes Voc and boosts PCE in the target spectral region when morphology and energy levels are well aligned, as illustrated for PTB7-Th:COTIC-4F:BTP-eC9 operating as the red subcell.","pith_extraction_headline":"Ternary blending in side-by-side RAINBOW solar cells raises efficiency from 12.9% in single-junction devices to 17.3% in three-junction devices."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.07718/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"doi_title_agreement","ran_at":"2026-05-19T18:31:18.975503Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T12:38:50.666590Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"097af1879ab16478ac47e9f091a78beb2fb7cd643ceec4ca0f1b95d9e97ddf66"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}