Enhanced open circuit voltage of small molecule acceptors containing angular-shaped indacenodithiophene units for P3HT-based organic solar cells
作者:Hongyan Huang、Bo Xiao、Chengting Huang、Jing Zhang、Shuli Liu、Nina Fu、Baomin Zhao、Tianshi Qin、Erjun Zhou、Wei Huang
DOI:10.1039/c8tc04608e
日期:——
fullerene free organic solar cells. The geometric shape of the l-IDT and a-IDT subunits plays a pivotal role in governing the optoelectronic properties, the charge mobility, the morphology and the photovoltaic performance of the resulting acceptors. Preliminarily, the device based on P3HT/l-IDTBTRh (1 : 08, w/w) displayed a circuit current density (Jsc) of 8.81 mA cm−2, an open-circuit voltage (Voc) of 0
角吲哚并[2,1- b:6,5- b ']二噻吩(a-IDT)作为线性-IDT (l-IDT)的类似物,其中中心苯环连接到α- IDT的β位通过分子内环化设计并利用了噻吩环但在其α位置稠合的噻吩环。两个A–D–A型小分子受体(SMA)l-IDTBTRh和a-IDTBTRh,以l-IDT和a-IDT为中心核,苯并噻二唑(BT)作为π桥受体链段,而3-乙基罗丹宁为合成了封端基团,并将其用于基于P3HT的不含富勒烯的有机太阳能电池。l-IDT的几何形状和A-IDT亚基起着支配光电特性,电荷迁移率,形态和所得到的受体的光伏性能起关键作用。最初,基于P3HT / l-IDTBTRh(1:08,w / w)的设备显示出8.81 mA cm -2的电路电流密度(J sc),0.86 V的开路电压(V oc)和填充因子(FF)为71.0%,实现了5.38%的体面PCE,这与较低的带隙,更好的电荷迁移率和形态有关。尽管光伏性能较差(2