Analysis of Anomalous Degradation of Cu(In,Ga)Se2 Thin-Film Solar Cells Irradiated with Protons
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概要
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We analyzed the radiation response of Cu(In,Ga)Se2 (CIGS) solar cells to high-fluence protons. An in situ measurement system was constructed to measure the electrical performance of the CIGS solar cells immediately after proton irradiation. Using this system, abrupt degradation of $I_{\text{sc}}$ in the cells irradiated with 0.38 MeV protons at room temperature was observed, which was caused by a decrease in the effective acceptor density of the CIGS absorbing layer according to its capacitance–voltage characteristics. Admittance spectra of proton irradiated CIGS solar cells indicate that the proton-induced defect might be an InCu antisite defect. This defect is a donor-like defect. Therefore, it compensates the acceptor density. The reduction in the density caused by majority carrier trapping by the defect caused an increase in the resistivity of the CIGS absorbing layer. Consequently, a type-conversion of the absorbing layer in the cells occurred because of high-fluence protons.
- Japan Society of Applied Physicsの論文
- 2007-07-25
著者
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Itoh Hisayoshi
Japan Atomic Energy Agency
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Odawara Osamu
Tokyo Institute Of Technology
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IMAIZUMI Mitsuru
Japan Aerospace Exploration Agency
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Yoda Shinichi
Japan Aerospace Exploration Agency
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Ohshima Takeshi
Japan Atomic Energy Agency
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Kawakita Shirou
Japan Aerospace Exploration Agency (JAXA), 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan
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Yoda Shinichi
Japan Aerospace Exploration Agency (JAXA), 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan
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Itoh Hisayoshi
Japan Atomic Energy Agency (JAEA), 1233 Watanuki, Takasaki, Gumma 370-1292, Japan
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Kibe Koichi
Japan Aerospace Exploration Agency (JAXA), 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan
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Imaizumi Mitsuru
Japan Aerospace Exploration Agency (JAXA), 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan
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Odawara Osamu
Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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Ohshima Takeshi
Japan Atomic Energy Agency (JAEA), 1233 Watanuki, Takasaki, Gumma 370-1292, Japan
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