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

2012, Volume 6, Issue 2

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Frontiers in Energy >> 2012, Volume 6, Issue 2 doi: 10.1007/s11708-012-0177-y

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

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

Available online: 2012-06-05

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Abstract

The open circuit voltage ( ) 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 of the OSC with 50% of DCJTB in CuPc increased by 15%, compared with that of the standard CuPc/fullerene (C ) device. The enhancement of the 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 C have low absorbance, leading to a broad absorption spectrum.

Keywords

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)

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