The surface passivation mechanism of graphene oxide for crystalline silicon

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

  • External authors:
  • M. Vaqueiro-Contreras
  • C. Bartlam
  • C. Byrne
  • R. S. Bonilla
  • V. P. Markevich

Abstract

We have recently demonstrated that low surface recombination velocities on Si crystals are achievable from room temperature graphene oxide (GO) deposition. Intrinsic properties of this material make it an appealing candidate for surface passivation in solar cells. There is, however, very little literature on the passivation mechanisms of GO and further understanding is required. In this work we have thus studied GO/SiO2/Si interface interactions by X-ray photoelectron spectroscopy (XPS). From our results we have confirmed that the passivation achieved by GO coatings do not result from chemical changes at the surfaces as has been previously suggested. In addition, close analysis of the spectra of GO coated silicon sample shows the elemental Si 2p peak is split into two doublets. We identify the appearance of this extra doublet to be the result of surface charging, and thus attribute the spectral change to formation of a depletion region at the silicon surface induced by GO's negative charge. Results in here presented may thus signify a significant step forward in the understanding of charged 2D materials passivation mechanisms and its use in advanced solar cell structures.

Bibliographical metadata

Original languageEnglish
Title of host publication2019 IEEE 46th Photovoltaic Specialists Conference, PVSC 2019
PublisherIEEE
Pages1931-1934
Number of pages4
ISBN (Electronic)9781728104942
DOIs
Publication statusPublished - Jun 2019
Event46th IEEE Photovoltaic Specialists Conference, PVSC 2019 - Chicago, United States
Event duration: 16 Jun 201921 Jun 2019

Publication series

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

Conference

Conference46th IEEE Photovoltaic Specialists Conference, PVSC 2019
CountryUnited States
CityChicago
Period16/06/1921/06/19