10-Fold-Stack Multilayer-Grown Nanomembrane GaAs Solar Cells

Boju Gai, Yukun Sun, Huandong Chen, Minjoo Larry Lee, Jongseung Yoon

Research output: Contribution to journalArticle

Abstract

Multilayer-grown nanomembrane GaAs represents an enabling materials platform for cost-efficient III-V photovoltaics. Herein we present for the first time 10-fold-stack ultrathin (emitter + base: 300 nm) GaAs solar cells. Photovoltaic performance of 10-fold-stack GaAs solar cells exhibited promising uniformity, with only slight efficiency degradation, where comparatively poor short-wavelength response was mainly responsible for the slightly reduced performance in early grown materials. Secondary ion mass spectrometry revealed the concentration of p-type dopant has been changed due to the out-diffusion of beryllium, while the extent of diffusion increasingly diminished in early grown stacks because of the reduced concentration gradient as well as the decrease of beryllium diffusivity at longer annealing times. It is therefore concluded that the performance degradation in 10-fold-stack GaAs solar cells does not develop continuously throughout the growth, but instead becomes spontaneously saturated at longer growth times, providing promising outlook for the practical application of multilayer epitaxy toward cost-competitive GaAs solar cells.

Original languageEnglish (US)
Pages (from-to)2786-2790
Number of pages5
JournalACS Photonics
Volume5
Issue number7
DOIs
StatePublished - Jul 18 2018

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Keywords

  • III-V solar cells
  • multilayer epitaxial assemblies
  • nanomembrane
  • transfer printing
  • ultrathin gallium arsenide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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