Effect of electron-withdrawing units on triphenylamine-based small molecules for solution-processed organic solar cells
作者:Yifan Wang、Huitao Bai、Pei Cheng、Mingyu Zhang、Xiaowei Zhan
DOI:10.1007/s11426-014-5217-5
日期:2015.2
Organic small molecules (TPA-BT3T, TPA-PT3T, and TPA-DFBT3T) using triphenylamine as a donor unit, terthiophene as a bridge, and benzo-2,1,3-thiadiazole (BT), [1,2,5]thiadiazolo[3,4-c]pyridine (PT) or 5,6-difluorobenzo[c][1,2,5]thiadiazole (DFBT) as an acceptor unit were designed and synthesized through Suzuki coupling reactions. These molecules exhibited good thermal stability with decomposition temperatures
有机小分子(TPA-BT3T,TPA-PT3T和TPA-DFBT3T),以三苯胺为供体单元,以噻吩为桥,以苯并2,1,3-噻二唑(BT)为原料,[1,2,5]通过铃木偶联反应设计并合成了噻二唑并[3,4- c ]吡啶(PT)或5,6-二氟苯并[ c ] [1,2,5]噻二唑(DFBT)作为受体单元。这些分子表现出良好的热稳定性,分解温度超过380°C,吸收范围从300到700 nm。用这些小分子作为供体和PC 71制造了光伏器件BM作为接受者。基于TPA-BT3T的设备的功率转换效率为2.89%,高于基于TPA-PT3T和TPA-DFBT3T的设备的功率转换效率(分别为1.34%和1.54%)。还研究了吸电子单元对吸收,能级,电荷传输,形态和光伏性质的影响。