Infrared photoconductivity and photovoltaic response from nanoscale domains of PbS alloyed with thorium and oxygen

N. Arad-Vosk, R. Beach, A. Ron, T. Templeman, Y. Golan, G. Sarusi, A. Sa'Ar

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Thin films of lead sulfide alloyed with thorium and oxygen were deposited on GaAs substrates and processed to produce a photo-diode structure. Structural, optical and electrical characterizations indicate the presence of small nanoscale domains (NDs) that are characterized by dense packaging, high quality interfaces and a blue-shift of the energy bandgap toward the short wavelength infrared range of the spectrum. Photocurrent spectroscopy revealed a considerable photoconductivity that is correlated with excitation of carriers in the NDs of lead sulfide alloyed with thorium and oxygen. Furthermore, the appearance of a photovoltaic effect under near infrared illumination indicates a quasi-type II band alignment at the interface of the GaAs and the film of NDs.

Original languageEnglish
Article number115202
JournalNanotechnology
Volume29
Issue number11
DOIs
StatePublished - 6 Feb 2018

Keywords

  • infrared photoconductivity
  • lead sulfide nanostructures
  • photovoltaics

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