Time-Resolved Microphotoluminescence Study of Cu(In,Ga)Se2
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概要
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The carrier recombination processes in Cu(In1-x,Gax)Se2 (CIGS) thin films were investigated by time-resolved microscopic-photoluminescence (μ-PL) measurement at room temperature. For films with $x = 0.45$, the spatial distribution of the donor--acceptor pair luminescence is much larger than the grain size. The PL decay lifetime is directly correlated with the μ-PL intensity, but the spectral shape is identical regardless of the sample position. These results suggest that the nonuniform distribution of nonradiative recombination centers mainly affects the carrier recombination in CIGS thin films. At relatively high Ga concentrations ($x \geq 0.7$), the spatial inhomogeneity in μ-PL intensity is enhanced and decay accelerated, suggesting an increase in the density of nonradiative recombination centers. Thus, suppression of nonradiative recombination is critical to enhancing the performance of CIGS-based solar cells.
- 2011-05-25
著者
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YAMADA Akimasa
National Institute of Advanced Industrial and Science Technology
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MATSUBARA Koji
National Institute of Advanced Industrial and Science Technology
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NIKI Shigeru
National Institute of Advanced Industrial and Science Technology
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Akimoto Katsuhiro
Institute Of Applied Physics University Of Tsukuba
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Ishizuka Shogo
National Inst. Advanced Industrial Sci. And Technol. (aist) Ibaraki Jpn
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Sakurai Takeaki
Institute Of Applied Physics University Of Tsukuba
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Islam Muhammad
Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
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Yamada Akimasa
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Niki Shigeru
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Taguchi Keiki
Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
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Matsubara Koji
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Akimoto Katsuhiro
Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
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Sakurai Takeaki
Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
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Ishizuka Shogo
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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