噻吩
氟
有机太阳能电池
接受者
分子
轨道能级差
聚合物太阳能电池
小分子
化学
光化学
材料科学
结晶学
太阳能电池
有机化学
聚合物
光电子学
物理
生物化学
凝聚态物理
作者
Anwang He,Yuancheng Qin,Weili Dai,Dan Zhou,Jian‐Ping Zou
标识
DOI:10.1016/j.cclet.2019.07.018
摘要
Three novel small molecules with acceptor-donor-acceptor (A-D-A) configuration, SBDT1, SBDT2 and SBDT3, where 4,8-bis(octyloxy)benzo[1,2-b:4,5-b′]dithiophene (BDT) as the electron-donating core connecting to thiophene-substituted benzothiadiazole (BT) as electron-withdrawing are reported. The effects of fluorine atoms on the photophysical properties by introducing different fluorine atoms into the benzothiadiazole unit were investigated. These SBDTs exhibit good thermal stability, excellent panchromatic absorption in solution and film. SBDT2 and SBDT3 with fluorine-substituted BT possess a relatively deeper the highest occupied molecular orbital (HOMO). These A-D-A type molecules were treated as donor and PC71BM as acceptor in bulk heterojunction (BHJ) small-molecule organic solar cells (SMOSCs). Among them, device based on SBDT2 gave the best device performance with a PCE of 5.06% with Jsc of 10.56 mA/cm2, Voc of 0.85 V, fill factor (FF) of 56.4%. These studies indicate that proper incorporation of fluorine atoms is an effective way to increase the efficiency of organic solar cells.
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