17.1%-Efficient Multi-Scale-Textured Black Silicon Solar Cells without Dielectric Antireflection Coating: Preprint

Research output: Contribution to conferencePaper

Abstract

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-scaletexturing 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 deepnanoporous 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.
Original languageAmerican English
Number of pages7
StatePublished - 2011
Event37th IEEE Photovoltaic Specialists Conference (PVSC 37) - Seattle, Washington
Duration: 19 Jun 201124 Jun 2011

Conference

Conference37th IEEE Photovoltaic Specialists Conference (PVSC 37)
CitySeattle, Washington
Period19/06/1124/06/11

NREL Publication Number

  • NREL/CP-5200-50707

Keywords

  • antireflection coatings
  • black silicon
  • multi-scale texture
  • PV
  • pyramid black etching
  • solar cells

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