期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 46, 页码 39952-39961出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b13928
关键词
organic solar cell; A-D-A structure; Coulombic interaction; molecular planarity; post-treatment
资金
- National Research Foundation (NRF) of Korea [NRF-2016M1A2A2940911, 2017K2A9A2A12000315, 2015M1A2A2057506, 2015R1D1A1A09056905]
- Research Projects of the KAIST-KUSTAR
In this study, we synthesized two acceptor-donor acceptor (A-D-A)-type small molecules (SMs) (P3T4-VCN and P3T4-INCN) with different terminal end-groups (dicyanovinyl (VCN) and 2-methylene-3-(1,1-dicyanomethylene)indanone (INCN)) based on the 1,4-bis(thiophenylphenylthiophene)-2,5-difluorophenylene (P3T4) core that possesses high coplanarity because of intrachain noncovalent Coulombic interactions. We investigated the influence of terminal end-groups on intermolecular packing and the resulting electrical and photovoltaic characteristics. A small change in the end-group structure of the SMs induces a significant variation in the torsional structures, molecular packing, and pristine/blend film morphology. It is noteworthy that the less crystalline P3T4-INCN with tilted conformation is highly sensitive to post-treatments (i.e., additives and annealing) such that it permits facile morphological modulation. However, the highly planar and crystalline P3T4 VCN exhibits a strong tolerance toward processing treatments. After morphology optimization, the fullerene-based bulk-heterojunction solar cell of tilted P3T4 INCN exhibits a power conversion efficiency (PCE) of 5.68%, which is significantly superior to that of P3T4 VCN:PC71BM (PCE = 1.29%). Our results demonstrate the importance of the terminal end-group for the design of A-D-A-type SMs and their sensitivity toward the postprocessing treatments in optimizing their performance.
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