Charge accumulation induced S-shape J-V curves in bilayer heterojunction organic solar cells

被引：152

作者：

Wang, J. C. ^{[1
]}

Ren, X. C. ^{[1
]}

Shi, S. Q. ^{[1
]}

Leung, C. W. ^{[2
]}

Chan, Paddy K. L. ^{[1
]}

机构：

[1] Hong Kong Polytech Univ, Dept Mech Engn, Hong Kong, Hong Kong, Peoples R China

[2] Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China

来源：

ORGANIC ELECTRONICS | 2011年 / 12卷 / 06期

关键词：

Organic solar cell; S-shape; Charge accumulation; Bilayer heterojunction; PHOTOVOLTAIC CELLS; EFFICIENCY; BANDGAP; C-60;

D O I：

10.1016/j.orgel.2011.02.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the origin of the S-shape effect in the current-voltage curve of bilayer heterojunction organic solar cell induced by the exciton blocking layer (EBL). By gradually increasing the BCP thickness, the J-V curves change from exponential shape to S-shape, leading to a twofold degraded in the fill factor (FF). The variations of the J-V curves are attributed to the charge accumulation effect induced by the BCP layer. The charge accumulation phenomenon is further verified by the C-V measurements and a numerical model based on continuity and transport equations is developed to qualitatively reproduce the S-shape effect. Our finding provides insight into the origin of S-shape effect in bilayer heterojunction photovoltaic devices induced by the exciton blocking layer and reveals the importance of controlling charge accumulation for high performance OPVs especially the tandem devices. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：880 / 885

页数：6

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