Toward Cost-Effective Manufacturing of Silicon Solar Cells: Electrodeposition of High-Quality Si Films in a CaCl2-based Molten Salt
- Authors
- Yang, X.; Ji, L.; Zou, X.; Lim, T.; Zhao, J.; Yu, E.T.; Bard, A.J.
- Issue Date
- Nov-2017
- Publisher
- Wiley-VCH Verlag
- Keywords
- calcium chloride; electrochemistry; electrodeposition; silicon; solar cells
- Citation
- Angewandte Chemie - International Edition, v.56, no.47, pp.15078 - 15082
- Journal Title
- Angewandte Chemie - International Edition
- Volume
- 56
- Number
- 47
- Start Page
- 15078
- End Page
- 15082
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/32127
- DOI
- 10.1002/anie.201707635
- ISSN
- 1433-7851
- Abstract
- Electrodeposition of Si films from a Si-containing electrolyte is a cost-effective approach for the manufacturing of solar cells. Proposals relying on fluoride-based molten salts have suffered from low product quality due to difficulties in impurity control. Here we demonstrate the successful electrodeposition of high-quality Si films from a CaCl2-based molten salt. Soluble SiIV−O anions generated from solid SiO2 are electrodeposited onto a graphite substrate to form a dense film of crystalline Si. Impurities in the deposited Si film are controlled at low concentrations (both B and P are less than 1 ppm). In the photoelectrochemical measurements, the film shows p-type semiconductor character and large photocurrent. A p–n junction fabricated from the deposited Si film exhibits clear photovoltaic effects. This study represents the first step to the ultimate goal of developing a cost-effective manufacturing process for Si solar cells based on electrodeposition. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
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