biostudies-literatureSu WSvenska Forskningsrådet FormasVetenskapsrådetNSFCKnut and Alice Wallenberg FoundationSouth China University of TechnologyChina Postdoctoral Science FoundationNational Natural Science Foundation of ChinaShanxi ProvinceKnut och Alice Wallenbergs StiftelseSwedish Research CouncilNational Natural Science Foundation of China (NSFC)Jiangsu Provincial Natural Science FoundationGuangzhou Key laboratory of Vacuum Coating Technologies and New Energy MaterialsNatural Science Foundation of Jiangsu ProvinceJinan UniversityGuangdong Science and Technology Research FoundationGuangdong ProvinceSwedish Research Council Formas3535-3543https://www.ebi.ac.uk/biostudies/studies/S-EPMC8518815biostudies-literatureUnknown14(17)How to simultaneously achieve both high open-circuit voltage (V_oc ) and high short-circuit current density (J_sc ) is a big challenge for realising high power conversion efficiency (PCE) in all-small-molecule organic solar cells (all-SM OSCs). Herein, a novel small molecule (SM)-donor, namely FYSM-SiCl, with trialkylsilyl and chlorine substitutions was designed and synthesized. Compared to the original SM-donor FYSM-H, FYSM-Si with trialkylsilyl substitution showed a decreased crystallinity and lower highest occupied molecular orbital (HOMO) level, while FYSM-SiCl had an improved crystallinity, more ordered packing arrangement, significantly lower HOMO level, and predominant "face-on" orientation. Matched with a SM-acceptor Y6, the FYSM-SiCl-based all-SM OSCs exhibitedChemSusChem13.4 % Efficiency from All-Small-Molecule Organic Solar Cells Based on a Crystalline Donor with Chlorine and Trialkylsilyl Substitutions.PMC85188152020-skllmd-07220051212020A14140100362020M6730542016.00592019JQ-244519731462017.0186KFVE202000062015-04853517731422019-04683BK201900992019B0909210022019B15151200732016-0614661774077Hou LYu LLi YGuo XWang EPeng QZhang MWang YFan QSu WYin Zfalse13.4 % Efficiency from All-Small-Molecule Organic Solar Cells Based on a Crystalline Donor with Chlorine and Trialkylsilyl Substitutions.How to simultaneously achieve both high open-circuit voltage (V_oc ) and high short-circuit current density (J_sc ) is a big challenge for realising high power conversion efficiency (PCE) in all-small-molecule organic solar cells (all-SM OSCs). Herein, a novel small molecule (SM)-donor, namely FYSM-SiCl, with trialkylsilyl and chlorine substitutions was designed and synthesized. Compared to the original SM-donor FYSM-H, FYSM-Si with trialkylsilyl substitution showed a decreased crystallinity and lower highest occupied molecular orbital (HOMO) level, while FYSM-SiCl had an improved crystallinity, more ordered packing arrangement, significantly lower HOMO level, and predominant "face-on" orientation. Matched with a SM-acceptor Y6, the FYSM-SiCl-based all-SM OSCs exhibited2021-01-01T00:00:00Z2021 Sep2026-06-02T18:32:01.951Z2025-04-04T10:55:25.891ZS-EPMC85188153405729310.1002/cssc.202100860