Plasma-induced TCO texture of ZnO:Ga back contacts on silicon thin film solar cells |
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Authors: | Kuang-Chieh LaiJen-Hung Wang Chun-hsiung LuFu-Ji Tsai Chih-Hung YehMau-Phon Houng |
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Affiliation: | a Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University, No. 1, Dasyue Rd., East District, Tainan City 701, Taiwan b NexPower Technology Corporation, Taichung County 421, Taiwan |
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Abstract: | This paper considers texturing of ZnO:Ga (GZO) films used as back contacts in amorphous silicon (a-Si) thin film solar cells. GZO thin films are first prepared by conventional methods. The as-deposited GZO surface properties are modified so that their use as back contacts on a-Si solar cells is enhanced. Texturing is performed by simple dry plasma etching in a CVD process chamber,at power=100 W, substrate temperature=190 °C (temperature is held at 190 °C because thin film solar cells are damaged above 200 °C), pressure=400 Pa and process gas H2 flow=700 sccm. Conventional a-Si solar cells are fabricated with and without GZO back contact surface treatment. Comparison of the with/without texturing GZO films shows that plasma etching increases optical scattering reflectance and reflection haze. SEM and TEM are used to evaluate the morphological treatment-induced changes in the films. Comparison of the a-Si solar cells with/without texturing shows that the plasma treatment increases both the short-circuit current density and fill factor. Consequently, a-Si solar cell efficiency is relatively improved by 4.6%. |
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Keywords: | Gallium-doped zinc oxide Transparent conductive oxide Scattering reflectance Textured surface Surface treatment Thin film solar cells |
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