17.1%-efficient multi-scale-textured black silicon solar cells without dielectric antireflection coating
Subtitle: preprint
By: Fatima Toor ... [et al.].
Contributors: National Renewable Energy Laboratory (U.S.); IEEE Photovoltaic Specialists Conference (37th : 2011 : Seattle, Wash.)
Series: NREL/CP -- 5200-50707; Conference paper (National Renewable Energy Laboratory (U.S.)) -- NREL/CP-5200-50707.
Publisher: National Renewable Energy Laboratory
Published: 2011
Place of publication: Golden, CO]
Language: eng
Format: [electronic resource] :
Subjects: Photovoltaic cells; Research; Silicon solar cells; Design and construction
Other titles: Seventeen point one percent efficient multi scale textured black silicon solar cells without dielectric antireflection coating
Description: 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 for the multi-scale textured solar cells.
Notes: Title from title screen (viewed August 8, 2011).

"July 2011."

"Presented at the 37th IEEE Photovoltaic Specialists Conference (PVSC 37), Seattle, Washington, June 19-24, 2011."

Includes bibliographical references (p. 5).

DE-AC36-08GO28308

Full text available via Internet in .pdf format. Adobe Acrobat Reader required.