Self-organization effect in poly(3-hexylthiophene): methanofullerenes solar cells
Yu Huang-Zhong(於黄忠)a)b)† and Peng Jun-Biao(彭俊彪)a)
a Institute of Polymer Optoelectronic Materials and Devices, Key Lab of Specially Functional Materials, South China University of Technology, Guangzhou 510640, China; b School of Physics , South China University of Technology, Guangzhou 510640, China
Abstract This paper studies the self-organization of the polymer in solar cells based on poly(3-hexylthiophene): [6, 6]-phenyl C$_{61}$-butyric acid methyl ester by controlling the growth rate of active layer. These blend films are characterized by UV-vis absorption spectroscopy, charge-transport dark $J-V$ curve, x-ray diffraction pattern curve, and atomic force microscopy. The results indicate that slowing down the drying process of the wet films leads to an enhanced self-organization, which causes an increased hole transport. Increased incident light absorption, higher carrier mobility, and balanced carrier transport in the active layer explain the enhancement in the device performance, the power conversion efficiency of 3.43% and fill factor up to 64.6%are achieved under Air Mass 1.5, 100 mW/cm$^{2}$.
Received: 17 October 2007
Revised: 09 January 2008
Accepted manuscript online:
Fund: Project supported by the National
`973' Project of China (Grant No 2002CB613405), the National Natural
Science Foundation of China (Grant No 90201023) and the Natural
Science Foundation of South China University of Technology (Grant No
E5040910).
Cite this article:
Yu Huang-Zhong(於黄忠) and Peng Jun-Biao(彭俊彪) Self-organization effect in poly(3-hexylthiophene): methanofullerenes solar cells 2008 Chin. Phys. B 17 3143
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