Photocurrent analysis of organic photovoltaic cells based on CuPc/C60 with Alq3 as a buffer layer

doi:10.1088/1674-1056/19/3/038602

Abstract The performance of an organic photovoltaic (OPV) cell based on copper phthalocyanine CuPc/C₆₀ with a tris-(8-hydroxyquinolinato) aluminum (Alq₃) buffer layer has been investigated. It was found that the power conversion efficiency of the device was 1.51% under illumination with an intensity of 100 mW/cm², which was limited by a square-root dependence of the photocurrent on voltage. The photocurrent--optical power density characteristics showed that the OPV cell had a significant space-charge limited photocurrent with a varied saturation voltage and a three quarters power dependence on optical power density. Also, the absorption spectrum was measured by a spectrophotometer, and the results showed that the additional Alq₃ layer has a minor effect on photocurrent generation.

Keywords: organic photovoltaic (OPV) cells buffer layer Alq₃ space-charge limited current

Received: 06 August 2009
Revised: 07 September 2009
Accepted manuscript online:

PACS:	84.60.Jt	(Photoelectric conversion)
	72.40.+w	(Photoconduction and photovoltaic effects)
	77.22.Jp	(Dielectric breakdown and space-charge effects)
	85.30.De	(Semiconductor-device characterization, design, and modeling)

Fund: Project 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 (Grant No.~60721001), Provincial Project (Grant No.~9140A02060609DZ0208), Program for New Century Excellent Talents in University (Grant No.~NCET-06-0812), SRF for ROCS, SEM (Grant No.~GGRYJJ08-05), and Young Excellent Project of Sichuan Province (Grant No.~09ZQ026-074).

Cite this article:

Wang Na-Na(王娜娜), Yu Jun-Sheng(于军胜), Zang Yue(臧月), and Jiang Ya-Dong(蒋亚东) Photocurrent analysis of organic photovoltaic cells based on CuPc/C₆₀ with Alq₃ as a buffer layer 2010 Chin. Phys. B 19 038602

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Photocurrent analysis of organic photovoltaic cells based on CuPc/C60 with Alq3 as a buffer layer

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Photocurrent analysis of organic photovoltaic cells based on CuPc/C₆₀ with Alq₃ as a buffer layer