Unsubstituted Benzodithiophene-Based Conjugated Polymers for High-Performance Organic Field-Effect Transistors and Organic Solar Cells

• DOI: 10.1021/acsami.6b06070
• Publication Date: 2016-07-12T14:04:00Z
• Authors: Weichao Chen; Manjun Xiao; Liangliang Han; Jidong Zhang; Huanxiang Jiang; Chuantao Gu; Wenfei Shen; Renqiang Yang
• Keywords: Organic semiconductor; Organic Electronics; Organic polymer

Unsubstituted benzo[1,2-b:4,5-b′]dithiophene (BDT) was used to construct a high-performance conjugated polymer with 5,6-difluoro-4,7-bis[4-(2-octyldodecyl)thiophene-2-yl]benzo[c][1,2,5] thiadiazole (DTFFBT), named PBDT-DTFFBT. The shows the low-lying highest occupied molecular orbital (HOMO) energy level (−5.40 eV) and broad absorption spectra strong vibronic peak. Pure films exhibit good crystallinity edge-on orientation, partially attributed BDT units without any side chains, as result, corresponding thin-film transistor showed excellent hole mobility over 1 cm2 V–1 s–1. Interestingly, well-distributed nanofibrillar aggregation face-on orientation obviously formed when blending PC71BM, which in favor of charge transportation. Consequently, bulk heterojunction solar cells based on blends high power conversion efficiency 9.29% large short-current density (14.56 mA cm–2) fill factor (0.751) process additives or thermal annealing.