Effect of electron-withdrawing units on triphenylamine-based small molecules for solution-processed organic solar cells

被引：8

作者：

Wang, Yifan ^{[1
,3
]}

Bai, Huitao ^{[1
]}

Cheng, Pei ^{[1
,3
]}

Zhang, Mingyu ^{[2
]}

Zhan, Xiaowei ^{[2
]}

机构：

[1] Chinese Acad Sci, CAS Key Lab Organ Solids, Inst Chem, Beijing 100190, Peoples R China

[2] Peking Univ, Dept Mat Sci & Engn, Coll Engn, Beijing 100871, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

SCIENCE CHINA-CHEMISTRY | 2015年 / 58卷 / 02期

基金：

中国国家自然科学基金;

关键词：

organic solar cell; small molecule; triphenylamine; electron-withdrawing unit; POWER CONVERSION EFFICIENCY; PERFORMANCE; THIAZOLOTHIAZOLE; BENZOTHIADIAZOLE; BENZODITHIOPHENE; THIOPHENE; ACCEPTOR; LAYER;

D O I：

10.1007/s11426-014-5217-5

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 over 380 A degrees C and broad absorption from 300 to 700 nm. Photovoltaic devices were fabricated with these small molecules as donors and PC71BM as an acceptor. The TPA-BT3T based devices exhibited a power conversion efficiency of 2.89%, higher than those of the TPA-PT3T- and TPA-DFBT3T-based devices (1.34% and 1.54% respectively). The effects of electron-withdrawing units on absorption, energy level, charge transport, morphology, and photovoltaic properties also were investigated.

引用

页码：331 / 338

页数：8

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