3 years ago

Toward Cost-Effective Manufacturing of Silicon Solar Cells: Electrodeposition of High-Quality Si Films in a CaCl2-based Molten Salt

Toward Cost-Effective Manufacturing of Silicon Solar Cells: Electrodeposition of High-Quality Si Films in a CaCl2-based Molten Salt
Xingli Zou, Edward T. Yu, Allen J. Bard, Xiao Yang, Ji Zhao, Li Ji, Taeho Lim
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. Creating cheaper solar cells: High-quality Si films for photovoltaic applications were fabricated by electrodeposition from molten CaCl2–CaO–SiO2. Soluble SiIV−O anions generated from solid SiO2 are electrodeposited onto a graphite substrate to form a dense and thick film of p-type Si. Impurities in the deposited Si film are controlled at low concentrations. The film exhibits good photoelectrochemical properties and clear photovoltaic effects.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201707635

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