17.1%-Efficient Multi-Scale-Textured Black Silicon Solar Cells without Dielectric Antireflection Coating: Preprint
In this work we present 17.1%-efficient p-type single crystal Si solar cells with a multi-scale-textured surface and no dielectric antireflection coating. Multi-scale texturing is achieved by a gold-nanoparticle-assisted nanoporous etch after conventional micron scale KOH-based pyramid texturing (pyramid black etching). By incorporating geometric enhancement of antireflection, this multi-scale texturing reduces the nanoporosity depth required to make silicon 'black' compared to nanoporous planar surfaces. As a result, it improves short-wavelength spectral response (blue response), previously one of the major limiting factors in 'black-Si' solar cells. With multi-scale texturing, the spectrum-weighted average reflectance from 350- to 1000-nm wavelength is below 2% with a 100-nm deep nanoporous layer. In comparison, roughly 250-nm deep nanopores are needed to achieve similar reflectance on planar surface. Here, we characterize surface morphology, reflectivity and solar cell performance of the multi-scale textured solar cells.
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- Conference: Presented at the 37th IEEE Photovoltaic Specialists Conference (PVSC 37), 19-24 June 2011, Seattle, Washington
- Research Org:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
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- Country of Publication:
- United States
- 14 SOLAR ENERGY; 36 MATERIALS SCIENCE; ANTIREFLECTION COATINGS; DIELECTRIC MATERIALS; ETCHING; MONOCRYSTALS; MORPHOLOGY; PERFORMANCE; REFLECTIVITY; SILICON; SILICON SOLAR CELLS; SOLAR CELLS; SPECTRAL RESPONSE; WAVELENGTHS; PV; BLACK SILICON; ANTIREFLECTION; MULTI-SCALE TEXTURE; PYRAMID BLACK ETCHING; Solar Energy - Photovoltaics
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