Effects of bulk and interfacial charge accumulation on fill factor in organic solar cells

被引：53

作者：

Chen, Bingbing ^{[1
,2
]}

Qiao, Xianfeng ^{[1
,2
]}

Liu, Chih-Ming ^{[3
]}

Zhao, Chen ^{[1
,2
]}

Chen, Hsiu-Cheng ^{[3
]}

Wei, Kung-Hwa ^{[3
]}

Hu, Bin ^{[1
,2
,4
]}

机构：

[1] Huazhong Univ Sci & Technol, WuHan Natl Lab Optoelect, Wuhan 430074, Peoples R China

[2] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China

[3] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30050, Taiwan

[4] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

来源：

APPLIED PHYSICS LETTERS | 2013年 / 102卷 / 19期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

POLYMER PHOTOVOLTAIC CELLS; PC84BM TRAPS; RECOMBINATION; CRYSTALLINITY; DISSOCIATION; PERFORMANCE; COLLECTION; MORPHOLOGY; EFFICIENCY; NETWORK;

D O I：

10.1063/1.4805053

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effects of charge accumulation on fill factor (FF) are studied by using light intensity-dependent current-voltage and capacitance-voltage measurements based on poly-{bi(dodecyl) thiophene-thieno[ 3,4-c]pyrrole-4,6-dione}:1(3-methyloxycarbonyl)propyl-1-phenyl [6,6] (PBTTPD:PCBM) solar cells. We find that the FF of un-annealed device shows a non-monotonic dependence of light intensity: first an increase and then a decrease with increasing light intensity. This suggests that both bulk charge accumulation and recombination determine the FF before thermal annealing. Furthermore, the morphological enhancement of PBTTPD: PCBM film leads to a monotonic decrease of FF as increasing light intensity. This indicates that only surface charge accumulation plays an important role in the determination of the FF after thermal annealing. (C) 2013 AIP Publishing LLC.

引用

页数：4

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