Power efficiency enhancement of solution-processed small-molecule solar cells based on squaraine via thermal annealing and solvent additive methods

被引：29

作者：

Guan, Zhiqiang ^{[1
]}

Yu, Junsheng ^{[1
]}

Huang, Jiang ^{[1
]}

Zhang, Lei ^{[1
]}

机构：

[1] Univ Elect Sci & Technol China, Sch Optoelect Informat, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610054, Peoples R China

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2013年 / 109卷

基金：

美国国家科学基金会;

关键词：

Organic solar cells; Solution processing; Small-molecule donor; Thermal annealing; Solvent additive; Onsager-Braun theory; ORGANIC PHOTOVOLTAIC CELLS; POLYMER;

D O I：

10.1016/j.solmat.2012.11.017

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

A small-molecule donor material of 2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl] squaraine (SQ) was used to fabricate the solution-processed solar cells with fullerene. The thermal annealing process and the solvent additive method were systematically investigated to illuminate their effects on the performance of solar cells. The optimized device exhibited a power conversion efficiency (PCE) of 3.31% under 1 sun, AM 1.5G simulated solar irradiation with thermal annealing at 50 degrees C and a small amount of 1,8-diiodooctane (DIO) additive with a volume ratio of 0.4%. A reduced surface roughness and improved charge carrier mobility were ascribed to the enhancement of PCE in DIO incorporated devices. The simulation using a theoretical model of charge transfer state based on Onsager-Braun theory was carried out, and the results revealed that thermal annealing and solvent additive could facilitate charge transfer dissociation, increase charge carrier generation, and thereby improve the performance of solar cells based on SQ: fullerene bulk heterojunction. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：262 / 269

页数：8

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