Direct growth of thin Ge-on-Si layer at low temperature as a template for lattice matched GaAs based solar cells

Ghada Dushaq, Aamenah Siddiqui, Khadija Jumaa, Ammar Nayfeh, Mahmoud Rasras

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

Abstract

We present a growth mechanism of low temperature thin Ge films directly grown on Si substrate for GaAs based solar cells. The Ge films are grown using RF-PECVD and their structural, electrical and optical properties are tested in order to use them as a template for III-V growth. A two-step temperature technique and different GeH 4 flow rates have been employed during the deposition process. Our optimized growth limits the defect nucleation or dislocation misfit to 50 nm at the Si/Ge interface. Morever, the measured threading dislocation density (TDD) of 700 nm thick Ge films is 1×106 cm -2 which paves the way to achieve high quality growth of GaAs for solar cells.

Original languageEnglish (US)
Title of host publication2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages3857-3860
Number of pages4
ISBN (Electronic)9781538685297
DOIs
StatePublished - Nov 26 2018
Event7th IEEE World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - Waikoloa Village, United States
Duration: Jun 10 2018Jun 15 2018

Publication series

Name2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC

Other

Other7th IEEE World Conference on Photovoltaic Energy Conversion, WCPEC 2018
CountryUnited States
CityWaikoloa Village
Period6/10/186/15/18

Keywords

  • GaAs solar cell
  • Ge-on-Si
  • low temperature

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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    Dushaq, G., Siddiqui, A., Jumaa, K., Nayfeh, A., & Rasras, M. (2018). Direct growth of thin Ge-on-Si layer at low temperature as a template for lattice matched GaAs based solar cells. In 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC (pp. 3857-3860). [8547737] (2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PVSC.2018.8547737