Frontiers in Energy >

2012 , Vol. 6 >Issue 2: 179 - 183

DOI: https://doi.org/10.1007/s11708-012-0177-y

RESEARCH ARTICLE

Enhancement of open circuit voltage in organic solar cells by doping a fluorescent red dye

  • Qing LI ,
  • Junsheng YU ,
  • Yue ZANG ,
  • Nana WANG ,
  • Yadong JIANG
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  • State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China

Received date: 06 Oct 2011

Accepted date: 23 Dec 2011

Published date: 05 Jun 2012

Copyright

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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Abstract

The open circuit voltage (VOC) of small-molecule organic solar cells (OSCs) could be improved by doping suitable fluorescent dyes into the donor layers. In this paper, 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) was used as a dopant, and the performance of the OSCs with different DCJTB concentration in copper phthalocyanine (CuPc) was studied. The results showed that the VOC of the OSC with 50% of DCJTB in CuPc increased by 15%, compared with that of the standard CuPc/fullerene (C60) device. The enhancement of the VOC was attributed to the lower highest occupied molecular orbital (HOMO) level in the DCJTB than that in the CuPc. Also, the light absorption intensity is enhanced between 400 and 550 nm, where CuPc and C60 have low absorbance, leading to a broad absorption spectrum.

Key words： organic solar cells (OSCs); open circuit voltage; fluorescent dye doping; 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB)

Cite this article

Qing LI , Junsheng YU , Yue ZANG , Nana WANG , Yadong JIANG . Enhancement of open circuit voltage in organic solar cells by doping a fluorescent red dye[J]. Frontiers in Energy, 2012 , 6(2) : 179 -183 . DOI: 10.1007/s11708-012-0177-y

Acknowledgements

This work was partially supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 60736005 and 60425101-1), the Foundation for Innovative Research Groups of the NSFC (No. 60721001), the Provincial Program (No. 9140A02060609DZ0208), Doctoral Fund of Ministry of China (No. 20090185110020), the Hi-Tech Research and Development Program of China (No. 2007AA03Z424), the Project Sponsored by SRF for ROCS, SEM (No.GGRYJJ08-05), and Young Excellence Project of Sichuan (No.09ZQ026-074).

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