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 |