Energy Level Alignment of Molybdenum Oxide on Colloidal Lead Sulfide (PbS) Thin Films for Optoelectronic Devices

Diogenes Placencia, Paul Lee, Joseph G. Tischler, Erin L Ratcliff

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Interfacial charge transport in optoelectronic devices is dependent on energetic alignment that occurs via a number of physical and chemical mechanisms. Herein, we directly connect device performance with measured thickness-dependent energy-level offsets and interfacial chemistry of 1,2-ethanedithiol-treated lead sulfide (PbS) quantum dots and molybdenum oxide. We show that interfacial energetic alignment results from partial charge transfer, quantified via the chemical ratios of Mo5+ relative to Mo6+. The combined effect mitigates leakage current in both the dark and the light, relative to a metal contact, with an overall improvement in open circuit voltage, fill factor, and short circuit current.

Original languageEnglish (US)
Pages (from-to)24981-24986
Number of pages6
JournalACS Applied Materials and Interfaces
Volume10
Issue number30
DOIs
StatePublished - Aug 1 2018

Keywords

  • interfaces
  • metal oxide
  • nanocrystals
  • optoelectronic devices
  • photoemission spectroscopy
  • solar cells

ASJC Scopus subject areas

  • Materials Science(all)

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