Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16855
Title: Charge accumulation induced S-shape J-V curves in bilayer heterojunction organic solar cells
Authors: Wang, JC
Ren, XC
Shi, SQ 
Leung, CW 
Chan, PKL
Keywords: Bilayer heterojunction
Charge accumulation
Organic solar cell
S-shape
Issue Date: 2011
Publisher: Elsevier Science Bv
Source: Organic electronics : physics, materials, applications, 2011, v. 12, no. 6, p. 880-885 How to cite?
Journal: Organic electronics : physics, materials, applications 
Abstract: 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.
URI: http://hdl.handle.net/10397/16855
ISSN: 1566-1199
EISSN: 1878-5530
DOI: 10.1016/j.orgel.2011.02.016
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