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Photocurrent analysis of organic photovoltaic cells based on CuPc/C60 with Alq3 as a buffer layer |
Wang Na-Na(王娜娜), Yu Jun-Sheng(于军胜)†, Zang Yue(臧月), and Jiang Ya-Dong(蒋亚东)‡ |
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China |
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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.
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Received: 06 August 2009
Revised: 07 September 2009
Accepted manuscript online:
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PACS:
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84.60.Jt
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(Photoelectric conversion)
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72.40.+w
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(Photoconduction and photovoltaic effects)
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77.22.Jp
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(Dielectric breakdown and space-charge effects)
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85.30.De
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(Semiconductor-device characterization, design, and modeling)
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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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