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Chinese Physics, 2005, Vol. 14(5): 1032-1035    DOI: 10.1088/1009-1963/14/5/031
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Efficient photovoltaic cells from low band-gap fluorene-based copolymer

Tian Ren-Yu (田仁玉)ab, Yang Ren-Qiang (阳仁强)a, Peng Jun-Biao (彭俊彪)ac, Cao Yong (曹镛)ac 
a Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640, China; b Department of Applied Physics, South China University of Technology, Guangzhou 510640, China; c Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology (South China University of Technology), Ministry of Education, Guangzhou, 510640, China
Abstract  Polymer photovoltaic cells based on low band-gap copolymer, poly[2,7-(9,9-dioctyl)fluorene-co-5,5’-(4,7-diselenophenyl)-2,2’-yl-2,1,3-benzothiadiazole] (PFSeBT), were investigated, focusing on the effects of cathode and blend concentration on device performances. The best device, with active layer from PFSeBT: PCBM=1:2 blend and with LiF/Al as cathode, shows an open-circuit voltage of 1.00 V, a short short-circuit current density of 4.42 mA/cm2, and energy conversion efficiency of 1.67% under AM1.5 illumination (100 mW/cm2). The short-circuit current density shows the dependence of power law dependence to on the incident light intensity with the power index of 0.887. All devices show spectral response until up to 680 nm. The results indicate that PFSeBT is a potential polymer functioning as electron donor in polymer photovoltaic cells.
Keywords:  Polymer photovoltaic cell      low band-gap copolymer      spectral response  
Received:  09 July 2004      Revised:  08 November 2004      Accepted manuscript online: 
PACS:  7240  
  7860  
  8630J  
Fund: 国家自然科学基金(90201023)和华南理工大学自然科学基金(E5123286)资助

Cite this article: 

Tian Ren-Yu (田仁玉), Yang Ren-Qiang (阳仁强), Peng Jun-Biao (彭俊彪), Cao Yong (曹镛) Efficient photovoltaic cells from low band-gap fluorene-based copolymer 2005 Chinese Physics 14 1032

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