Micromorph tandem solar cells: optimization of the microcrystalline silicon bottom cell in a single chamber system |
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Authors: | Zhang Xiao-Dan Zheng Xin-Xi Xu Sheng-Zhi Lin Quan Wei Chang-Chun Sun Jian Geng Xin-Hua Zhao Ying |
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Affiliation: | Institute of Photo-electronic Thin Film Devices and Technology of Nankai University, Tianjin 300071, China |
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Abstract: | We report on the development of single chamber deposition of microcrystalline and micromorph tandem solar cells directly onto low-cost glass substrates. The cells have pin single-junction or pin/pin double-junction structures on glass substrates coated with a transparent conductive oxide layer such as SnO2 or ZnO. By controlling boron and phosphorus contaminations, a single-junction microcrystalline silicon cell with a conversion efficiency of 7.47% is achieved with an i-layer thickness of 1.2 μm. In tandem devices, by thickness optimization of the microcrystalline silicon bottom solar cell, we obtained an initial conversion efficiency of 9.91% with an aluminum (Al) back reflector without a dielectric layer. In order to enhance the performance of the tandem solar cells, an improved light trapping structure with a ZnO/Al back reflector is used. As a result, a tandem solar cell with 11.04% of initial conversion efficiency has been obtained. |
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Keywords: | amorphous and microcrystalline silicon single chamber solar cells |
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