Optimization of μc-Si1−xGex:H Single-Junction Solar Cells with Enhanced Spectral Response and Improved Film Quality
This article is part of Special Issue:
Yen-Tang Huang,
Pei-Ling Chen,
Po-Wei Chen,
Hung-Jung Hsu,
Cheng-Hang Hsu,
Chuang-Chuang Tsai,
Corresponding Author
Yen-Tang Huang
Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan nctu.edu.tw
Search for more papers by this authorPei-Ling Chen
Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan nctu.edu.tw
Search for more papers by this authorPo-Wei Chen
Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan nctu.edu.tw
Search for more papers by this authorHung-Jung Hsu
Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan nctu.edu.tw
Search for more papers by this authorCheng-Hang Hsu
Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan nctu.edu.tw
Search for more papers by this authorChuang-Chuang Tsai
Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan nctu.edu.tw
Search for more papers by this authorYen-Tang Huang,
Pei-Ling Chen,
Po-Wei Chen,
Hung-Jung Hsu,
Cheng-Hang Hsu,
Chuang-Chuang Tsai,
Corresponding Author
Yen-Tang Huang
Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan nctu.edu.tw
Search for more papers by this authorPei-Ling Chen
Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan nctu.edu.tw
Search for more papers by this authorPo-Wei Chen
Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan nctu.edu.tw
Search for more papers by this authorHung-Jung Hsu
Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan nctu.edu.tw
Search for more papers by this authorCheng-Hang Hsu
Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan nctu.edu.tw
Search for more papers by this authorChuang-Chuang Tsai
Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan nctu.edu.tw
Search for more papers by this authorFirst published: 24 June 2015
Academic Editor: Jürgen Hüpkes
Abstract
Effects of RF power on optical, electrical, and structural properties of μc-Si1−xGex:H films was reported. Raman and FTIR spectra from μc-Si1−xGex:H films reflected the variation in microstructure and bonding configuration. Unlike increasing the germane concentration for Ge incorporation, low RF power enhanced Ge incorporation efficiency in μc-Si1−xGex:H alloy. By decreasing RF power from 100 to 50 W at a fixed reactant gas ratio, the optical bandgap of μc-Si1−xGex:H was reduced owing to the increase in Ge content from 11.2 to 23.8 at.%, while Ge-related defects and amorphous phase were increased. Consequently, photo conductivity of 1.62 × 10−5 S/cm was obtained for the μc-Si1−xGex:H film deposited at 60 W. By applying 0.9 μm thick μc-Si1−xGex:H absorber with XC of 48% and [Ge] of 16.4 at.% in the single-junction cell, efficiency of 6.18% was obtained. The long-wavelength response of μc-Si1−xGex:H cell was significantly enhanced compared with the μc-Si:H cell. In the case of tandem cells, 0.24 μm a-Si:H/0.9 μm μc-Si1−xGex:H tandem cell exhibited a comparable spectral response as 0.24 μm a-Si:H/1.4 μm μc-Si:H tandem cell and achieved an efficiency of 9.44%.
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