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  • Title: Versatile control of metal-assisted chemical etching for vertical silicon microwire arrays and their photovoltaic applications.
    Author: Um HD, Kim N, Lee K, Hwang I, Hoon Seo J, Yu YJ, Duane P, Wober M, Seo K.
    Journal: Sci Rep; 2015 Jun 10; 5():11277. PubMed ID: 26060095.
    Abstract:
    A systematic study was conducted into the use of metal-assisted chemical etching (MacEtch) to fabricate vertical Si microwire arrays, with several models being studied for the efficient redox reaction of reactants with silicon through a metal catalyst by varying such parameters as the thickness and morphology of the metal film. By optimizing the MacEtch conditions, high-quality vertical Si microwires were successfully fabricated with lengths of up to 23.2 μm, which, when applied in a solar cell, achieved a conversion efficiency of up to 13.0%. These solar cells also exhibited an open-circuit voltage of 547.7 mV, a short-circuit current density of 33.2 mA/cm(2), and a fill factor of 71.3% by virtue of the enhanced light absorption and effective carrier collection provided by the Si microwires. The use of MacEtch to fabricate high-quality Si microwires therefore presents a unique opportunity to develop cost-effective and highly efficient solar cells.
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