Device and material characteristics of GalnP solar cells grown on Ge substrates by molecular beam epitaxy

Taizo Masuda, Joseph Faucher, Paul J. Simmonds, Kenichi Okumura, Minjoo Larry Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We investigated the characteristics of GalnP solar cells grown directly on Ge substrates by molecular beam epitaxy (MBE). For comparison, GaAs solar cells were also grown on Ge substrates using similar initiation conditions. Compared to cells on GaAs, large degradation in open-circuit voltage (Voc) and short-circuit current density (Jsc) were observed in GaInP/Ge cells, while only small reductions were observed for GaAs/Ge. Transmission electron microscopy reveals an extremely high threading dislocation density (TDD) in the 109 cm-2 range in GaInP/Ge, four orders of magnitude larger than that of GaAs/Ge, despite the minimal lattice mismatch in both cells. GaInP/Ge initiation is far more challenging than GaAs/Ge initiation by MBE, and a homoepitaxial Ge layer will likely be necessary to obtain high-quality films.

Original languageEnglish (US)
Title of host publication2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2344-2348
Number of pages5
ISBN (Electronic)9781509027248
DOIs
StatePublished - Nov 18 2016
Externally publishedYes
Event43rd IEEE Photovoltaic Specialists Conference, PVSC 2016 - Portland, United States
Duration: Jun 5 2016Jun 10 2016

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
Volume2016-November
ISSN (Print)0160-8371

Other

Other43rd IEEE Photovoltaic Specialists Conference, PVSC 2016
Country/TerritoryUnited States
CityPortland
Period6/5/166/10/16

Keywords

  • GaInP solar cell
  • Germanium substrate
  • MBE
  • four-junction
  • lattice-matched

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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