標題: Impact of intrinsic amorphous silicon bilayers in silicon heterojunction solar cells
作者: Sai, Hitoshi
Chen, Po-Wei
Hsu, Hung-Jung
Matsui, Takuya
Nunomura, Shota
Matsubara, Koji
光電工程學系
Department of Photonics
公開日期: 14-Sep-2018
摘要: The impact of intrinsic amorphous silicon bilayers in amorphous silicon/crystalline silicon (a-Si:H/ c-Si) heterojunction solar cells is investigated. The microstructure factor R* of the interfacial a-Si: H layer, which is related to the Si-H bond microstructure and determined by infrared absorption spectroscopy, is controlled in a wide range by varying the growth pressure and the power density in plasma-enhanced chemical vapor deposition process. Surface passivation at the a-Si:H/c-Si interface is significantly improved by using an intrinsic a-Si:H bilayer, i.e., a stack of an interfacial layer with a large R* and an additional dense layer, particularly after the deposition of an overlying p-type a-Si:H layer. Consequently, the conversion efficiency of a-Si:H/c-Si heterojunction solar cells is markedly increased. However, it is also revealed that such an interfacial layer causes some negative effects including the increase in the series resistance and the current loss at the front side, depending on the growth condition. This result indicates that the interfacial layer has a significant impact on both the majority and the minority carrier transport. Thus, R* of the interfacial layer is an important parameter for obtaining good surface passivation at the a-Si/c-Si interface, but not the sole parameter determining the conversion efficiency of a-Si:H/c-Si heterojunction solar cells. Published by AIP Publishing.
URI: http://dx.doi.org/10.1063/1.5045155
http://hdl.handle.net/11536/148148
ISSN: 0021-8979
DOI: 10.1063/1.5045155
期刊: JOURNAL OF APPLIED PHYSICS
Volume: 124
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