Determination of undoped CdTe(111) surface polarity by surface photovoltage spectroscopy

L. Burstein, Yoram Shapira*, E. Moons, David Cahen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Surface photovoltage spectroscopy has been used as a clear, simple method to identify the two polar faces [(111) and (111)] of undoped CdTe. The difference in electronic structure of the two faces is clearly observed in air on polished untreated samples. The (111)Te surface is characterized by an acceptor level, at an energy 1.17 eV below the conduction-band minimum, which is assumed to result from TeO2-CdTe interaction. The (111)Cd surface is distinguished by two additional donor levels, at 1.11 and 1.33 eV above the valence-band maximum, which seem to be due to Cd surface atom displacements, accompanying the Te oxidation. These assignments are supported by the results obtained after various chemical treatments.

Original languageEnglish
Pages (from-to)201-206
Number of pages6
JournalApplied Surface Science
Volume74
Issue number2
DOIs
StatePublished - Feb 1994

Funding

FundersFunder number
Israel National Council for R&D

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