Wet-etch texturing of ZnO:Ga back layer on superstrate-type microcrystalline silicon solar cells

Kuang Chieh Lai; Fu Ji Tsai; Jen Hung Wang; Chih Hung Yeh; Mau Phon Houng

doi:10.1016/j.solmat.2011.02.011

Wet-etch texturing of ZnO:Ga back layer on superstrate-type microcrystalline silicon solar cells

Kuang Chieh Lai, Fu Ji Tsai, Jen Hung Wang, Chih Hung Yeh, Mau Phon Houng

Research output: Contribution to journal › Review article

4 Citations (Scopus)

Abstract

Surface wet etching is applied to the ZnO:Ga (GZO) back contact in μc-Si thin film solar cells. GZO transparency increases with increasing deposition substrate temperature. Texturing enhances reflective scattering, with etching around 56 s producing the best scattering, whereas etching around 5 s produces the best fabricated solar cells. Etching beyond these times produces suboptimal performance related to excessive erosion of the GZO. The best μc-Si solar cell achieves FF=68%, V_OC=471 mV and J_SC=21.48 mA/cm ² (η=6.88%). Improvement is attributed to enhanced texture-induced scattering of light reflected back into the solar cell, increasing the efficiency of our lab-made single μc-Si solar cells from 6.54% to 6.88%. Improved external quantum efficiency is seen primarily in the longer wavelengths, i.e. 6001100 nm. However, variation of the fabrication conditions offers opportunity for significant tuning of the optical absorption spectrum.

Original language	English
Pages (from-to)	1583-1586
Number of pages	4
Journal	Solar Energy Materials and Solar Cells
Volume	95
Issue number	7
DOIs	https://doi.org/10.1016/j.solmat.2011.02.011
Publication status	Published - 2011 Jul 1

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films

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title = "Wet-etch texturing of ZnO:Ga back layer on superstrate-type microcrystalline silicon solar cells",

abstract = "Surface wet etching is applied to the ZnO:Ga (GZO) back contact in μc-Si thin film solar cells. GZO transparency increases with increasing deposition substrate temperature. Texturing enhances reflective scattering, with etching around 56 s producing the best scattering, whereas etching around 5 s produces the best fabricated solar cells. Etching beyond these times produces suboptimal performance related to excessive erosion of the GZO. The best μc-Si solar cell achieves FF=68%, VOC=471 mV and JSC=21.48 mA/cm 2 (η=6.88%). Improvement is attributed to enhanced texture-induced scattering of light reflected back into the solar cell, increasing the efficiency of our lab-made single μc-Si solar cells from 6.54% to 6.88%. Improved external quantum efficiency is seen primarily in the longer wavelengths, i.e. 6001100 nm. However, variation of the fabrication conditions offers opportunity for significant tuning of the optical absorption spectrum.",

author = "Lai, {Kuang Chieh} and Tsai, {Fu Ji} and Wang, {Jen Hung} and Yeh, {Chih Hung} and Houng, {Mau Phon}",

year = "2011",

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doi = "10.1016/j.solmat.2011.02.011",

language = "English",

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journal = "Solar Energy Materials and Solar Cells",

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TY - JOUR

T1 - Wet-etch texturing of ZnO:Ga back layer on superstrate-type microcrystalline silicon solar cells

AU - Lai, Kuang Chieh

AU - Tsai, Fu Ji

AU - Wang, Jen Hung

AU - Yeh, Chih Hung

AU - Houng, Mau Phon

PY - 2011/7/1

Y1 - 2011/7/1

N2 - Surface wet etching is applied to the ZnO:Ga (GZO) back contact in μc-Si thin film solar cells. GZO transparency increases with increasing deposition substrate temperature. Texturing enhances reflective scattering, with etching around 56 s producing the best scattering, whereas etching around 5 s produces the best fabricated solar cells. Etching beyond these times produces suboptimal performance related to excessive erosion of the GZO. The best μc-Si solar cell achieves FF=68%, VOC=471 mV and JSC=21.48 mA/cm 2 (η=6.88%). Improvement is attributed to enhanced texture-induced scattering of light reflected back into the solar cell, increasing the efficiency of our lab-made single μc-Si solar cells from 6.54% to 6.88%. Improved external quantum efficiency is seen primarily in the longer wavelengths, i.e. 6001100 nm. However, variation of the fabrication conditions offers opportunity for significant tuning of the optical absorption spectrum.

AB - Surface wet etching is applied to the ZnO:Ga (GZO) back contact in μc-Si thin film solar cells. GZO transparency increases with increasing deposition substrate temperature. Texturing enhances reflective scattering, with etching around 56 s producing the best scattering, whereas etching around 5 s produces the best fabricated solar cells. Etching beyond these times produces suboptimal performance related to excessive erosion of the GZO. The best μc-Si solar cell achieves FF=68%, VOC=471 mV and JSC=21.48 mA/cm 2 (η=6.88%). Improvement is attributed to enhanced texture-induced scattering of light reflected back into the solar cell, increasing the efficiency of our lab-made single μc-Si solar cells from 6.54% to 6.88%. Improved external quantum efficiency is seen primarily in the longer wavelengths, i.e. 6001100 nm. However, variation of the fabrication conditions offers opportunity for significant tuning of the optical absorption spectrum.

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