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In this study, we report an appreciably increased efficiency from 6% up to 9.1% of hydrogenated amorphous silicon germanium (a-SiGe:H) thin film solar cells by using a combination of different p-doped window layers, such as boron doped hydrogenated amorphous silicon (p-a-Si:H), amorphous silicon oxide (p-a-SiOx:H), microcrystalline silicon (p-µc-Si:H), and microcrystalline silicon oxide (p-µc-SiOx...
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