Effects of alkyl chains on intermolecular packing and device performance in small molecule based organic solar cells
作者:Yamin Zhang、Miaomiao Li、Huanran Feng、Wang Ni、Hongtao Zhang、Feng Liu、Xiangjian Wan、Yongsheng Chen
DOI:10.1016/j.dyepig.2017.02.015
日期:2017.6
Two donor molecules named as DR3TDTC-C6 and DR3TDTC-C8 with n-hexyl and n-octyl alkyl chains on the central building block 7H-cyclopenta-[1,2-b:3,4-b’]-dithiophene (DTC) were designed and synthesized. Both of them exhibited PCEs >4%. The photovoltaic properties of these molecules were superior to their analogous donor molecule DR3TDTC, which possess two 2-ethyl hexyl alkyl chains on the same core unit
在中央结构单元7H-cyclopenta- [1,2- b:3,4- b'上具有正己基和正辛基烷基链的名为DR3TDTC-C6和DR3TDTC-C8的两个供体分子设计并合成了]-二噻吩(DTC)。他们两个都表现出PCE> 4%。这些分子的光电性能优于其类似的供体分子DR3TDTC,后者在相同的核心单元上具有两个2-乙基己基烷基链,经过精心的后处理后,其PCE仅为0.75%。系统地研究了烷基链对这三个分子的光学,电化学性质,堆积性质和形态的影响。结果表明,它们的器件性能之间的差异主要受其分子间堆积状态的影响。这表明在设计用于小分子有机太阳能电池的供体分子时,应仔细考虑中心单元上烷基链的长度和分支结构。