Effects of electrical contacts on the photoconductive gain of nanowire photodetectors

Hongsik Park, Jin Ho Kim, Roderic Beresford, Jimmy Xu

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The mechanism of the photoconductive gains of nanowire (NW) photodetectors has not been clearly explained yet, although it is generally thought to be the result of a long excess carrier lifetime due to a large trap density. Here, we demonstrate that the photoconductive gain of a Bi2S3 NW photodetector can be contributed by optical modulation of the electrical injection through contacts. We propose a quantitative model to explain the results based on a model of metal-nanowire contacts. The study shows that optically generated excess carriers can modify the barrier structure at the metal-nanowire interface and thereby increase photoconductivity.

Original languageEnglish
Article number143110
JournalApplied Physics Letters
Volume99
Issue number14
DOIs
StatePublished - 3 Oct 2011

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