標題: Ultrafast carrier dynamics in Cu(In,Ga)Se-2 thin films probed by femtosecond pump-probe spectroscopy
作者: Chen, Shih-Chen
Liao, Yu-Kuang
Chen, Hsueh-Ju
Chen, Chia-Hsiang
Lai, Chih-Huang
Chueh, Yu-Lun
Kuo, Hao-Chung
Wu, Kaung-Hsiung
Juang, Jenh-Yih
Cheng, Shun-Jen
Hsieh, Tung-Po
Kobayashi, Takayoshi
電子物理學系
光電工程學系
Department of Electrophysics
Department of Photonics
公開日期: 4-六月-2012
摘要: Ultrafast carrier dynamics in Cu(In,Ga)Se-2 films are investigated using femtosecond pump-probe spectroscopy. Samples prepared by direct sputtering and co-evaporation processes, which exhibited remarkably different crystalline structures and free carrier densities, were found to result in substantially different carrier relaxation and recombination mechanisms. For the sputtered CIGS films, electron-electron scattering and Auger recombination was observed, whereas for the co-evaporated CIGS films, bandgap renormalization accompanied by band filling effect and hot phonon relaxation was observed. The lifetime of defect-related recombination in the co-evaporated CIGS films is much longer than that in the direct-sputtered CIGS films, reflecting a better quality with higher energy conversion efficiency of the former. (c) 2012 Optical Society of America
URI: http://hdl.handle.net/11536/16491
ISSN: 1094-4087
期刊: OPTICS EXPRESS
Volume: 20
Issue: 12
結束頁: 12675
顯示於類別:期刊論文


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