Physisorption of Oxygen in SnO2 Nanoparticles for Perovskite Solar Cells

Waseem Ahmad, Detao Liu, Waqas Ahmad, Yafei Wang, Peng Zhang, Ting Zhang, Hualin Zheng, Zhi D. Chen, Shibin Li

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Although SnO2 is widely used in perovskite solar cells (PSCs) as the electron transport layer, there is still a need for a detailed investigation regarding the impact of physisorption on the performance of PSCs. Here, we report the role of physisorption of oxygen species from the ambient atmosphere in the oxidation states and defective oxides at the surface of SnO2 nanoparticles for the performance of PSCs. The SnO2 nanoparticle's thin film shows a higher oxidation state (Sn-O) and lower charge trap sites at an annealing temperature of 100 °C, and the SnO2 film based PSCs yield an efficiency of 18.04%. The annealing process results in the gradual desorption of physically adsorbed oxygen species. Therefore, the annealing process of SnO2 nanoparticle thin films in atmosphere is the key factor to control the oxidation states and defective oxides at the surface of SnO2 nanoparticle thin films.

Original languageEnglish
Article number8534422
Pages (from-to)200-206
Number of pages7
JournalIEEE Journal of Photovoltaics
Volume9
Issue number1
DOIs
StatePublished - Jan 2019

Bibliographical note

Publisher Copyright:
© 2011-2012 IEEE.

Keywords

  • Electron transport layer (ETL)
  • X-ray photoelectron spectroscopy (XPS)
  • oxidation states
  • oxygen adsorption
  • perovskite solar cells (PSCs)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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