標題: A Comprehensive Study of One-Step Selenization Process for Cu(In1-xGax) Se-2 Thin Film Solar Cells
作者: Chen, Shih-Chen
Wang, Sheng-Wen
Kuo, Shou-Yi
Juang, Jenh-Yih
Lee, Po-Tsung
Luo, Chih Wei
Wu, Kaung-Hsiung
Kuo, Hao-Chung
電子物理學系
光電工程學系
光電工程研究所
Department of Electrophysics
Department of Photonics
Institute of EO Enginerring
關鍵字: Selenization;CIGS;Solar cell;MoSe2;Pump-probe spectroscopy
公開日期: 21-Mar-2017
摘要: In this work, aiming at developing a rapid and environmental-friendly process for fabricating CuIn1-xGaxSe2 (CIGS) solar cells, we demonstrated the one-step selenization process by using selenium vapor as the atmospheric gas instead of the commonly used H2Se gas. The photoluminescence (PL) characteristics indicate that there exists an optimal location with superior crystalline quality in the CIGS thin films obtained by one-step selenization. The energy dispersive spectroscopy (EDS) reveals that the Ga lateral distribution in the one-step selenized CIGS thin film is intimately correlated to the blue-shifted PL spectra. The surface morphologies examined by scanning electron microscope (SEM) further suggested that voids and binary phase commonly existing in CIGS films could be successfully eliminated by the present one-step selenization process. The agglomeration phenomenon attributable to the formation of MoSe2 layer was also observed. Due to the significant microstructural improvement, the current-voltage (J-V) characteristics and external quantum efficiency (EQE) of the devices made of the present CIGS films have exhibited the remarkable carrier transportation characteristics and photon utilization at the optimal location, resulting in a high conversion efficiency of 11.28%. Correlations between the defect states and device performance of the one-step selenized CIGS thin film were convincingly delineated by femtosecond pump-probe spectroscopy.
URI: http://dx.doi.org/10.1186/s11671-017-1993-0
http://hdl.handle.net/11536/145220
ISSN: 1556-276X
DOI: 10.1186/s11671-017-1993-0
期刊: NANOSCALE RESEARCH LETTERS
Volume: 12
起始頁: 0
結束頁: 0
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