A tunable colloidal quantum dot photo field-effect transistor

Subir Ghosh, Sjoerd Hoogland, Vlad Sukhovatkin, Larissa Levina, Edward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

We fabricate and investigate field-effect transistors in which a light-absorbing photogate modulates the flow of current along the channel. The photogate consists of colloidal quantum dots that efficiently transfer photoelectrons to the channel across a charge-separating (type-II) heterointerface, producing a primary and sustained secondary flow that is terminated via electron back-recombination across the interface. We explore colloidal quantum dot sizes corresponding to bandgaps ranging from 730 to 1475 nm and also investigate various stoichiometries of aluminum-doped ZnO (AZO) channel materials. We investigate the role of trap state energies in both the colloidal quantum dot energy film and the AZO channel.

Original languageEnglish (US)
Article number101102
JournalApplied Physics Letters
Volume99
Issue number10
DOIs
StatePublished - Sep 5 2011

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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