Small molecules incorporating regioregular oligothiophenes and fluorinated benzothiadiazole groups for solution-processed organic solar cells

被引：18

作者：

Yuan, Liu ^{[1
,2
]}

Zhao, Yifan ^{[1
,3
]}

Lu, Kun ^{[1
]}

Deng, Dan ^{[1
,2
]}

Yan, Wei ^{[3
]}

Wei, Zhixiang ^{[1
]}

机构：

[1] Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China

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

[3] Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2014年 / 2卷 / 29期

基金：

中国国家自然科学基金;

关键词：

POWER CONVERSION EFFICIENCY; POLYMER-FULLERENE BLENDS; OPEN-CIRCUIT VOLTAGE; PHOTOVOLTAIC CELLS; CONJUGATED POLYMER; HIGH-PERFORMANCE; CHARGE-TRANSPORT; POLY(3-HEXYLTHIOPHENE); MORPHOLOGY; RECOMBINATION;

D O I：

10.1039/c4tc00921e

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Small molecules incorporating regioregular oligothiophenes and fluorinated benzothiadiazole groups were synthesized for solution-processed organic solar cells. The length of oligothiophene units showed profound influences on light absorption, energy levels, crystalline behaviors and active layer morphologies. The photovoltaic performances were tested using mixed-solvent processing methods. When blended with [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM) as the active layer, the shorter molecule, 4TA4T, achieved a power conversion efficiency (PCE) of 3.81%, with an open circuit voltage (V-oc) of 0.83 V, a short current density (J(sc)) of 8.02 mA cm(-2) and a Fill Factor (FF) of 0.57. The longer molecule, 6TA6T, showed a lower PCE of 3.21% due to a lower V-oc of 0.74 V. This study provides detailed insights for the designing of small molecules by subtle changes in donor lengths.

引用

页码：5842 / 5849

页数：8

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