期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 37, 页码 41506-41514出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11410
关键词
dimeric porphyrin donor; benzodithiophene; non-fullerene acceptor; side-chain engineering; organic solar cells
资金
- Hong Kong Baptist University [FRG2-17-18-068, RC-ICRS/1617/02C-CHE, RC-ICRS-18-19-01A, RC-IRMS/16/17/02CHEM]
- DOE, Office of Science, and Office of Basic Energy Sciences
- Beijing National Laboratory of Molecular Science [BNLMS201902]
Two new A-D-A small-molecule donors (C8T-BDTDP and C8ST-BDTDP) are prepared from benzodithiophene (BDT)-linked dimeric porphyrin (DP), which differ in side chains of BDT linkers with 4,8-bis[5-(2-ethylhexyl)thiophen-2-yl]benzo[1,2-b:4,5-b']dithiophene (C8T-BDT) for the former and 4,8-bis{5-[(2-ethylhexyl)thio]-2-thienyl}benzo[1,2-b: 4,5-b']-dithiophene (C8ST-BDT) for the latter. Both dimeric porphyrin donors show strongly UV-visible to near-infrared absorption. Compared to C8T-BDTDP, C8ST-BDTDP with an alkylthiothienyl-substituted BDT linker exhibits more intense absorption bands in the film and a lower highest occupied molecular orbital energy level. The blend film of the electron acceptor 6TIC with the respective dimeric porphyrin donor displays a broad photon response from 400 to 900 nm, unfortunately, with an absorption valley at ca. 600 nm. The device based on C8ST-BDTDP/6TIC demonstrates a promising power conversion efficiency (PCE) of 10.39% with a high short-circuit current density (J(SC)) of 19.53 mA cm(-2), whereas the device based on C8T-BDTDP/6TIC shows a slightly lower PCE of 8.73% with a J(SC) of 17.75 mA cm(-2). The better performance for C8ST-BDTDP/6TIC is mainly attributed to efficient charge dissociation and transportation because of the smooth surface morphology and highly ordered crystalline packing.
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