InGaAs metal-semiconductor-metal photodetectors with a hybrid combination of transparent and opaque electrodes

Walter Wohlmuth, Mohamed Arafa, Patrick Fay, Ilesanmi Adesida

Research output: Contribution to journalArticlepeer-review

Abstract

A metal-semiconductor-metal photodetector (MSMPD) with a hybrid combination of transparent cadmium-tin-oxide and opaque Ti:Au electrodes is proposed and demonstrated. A significant decrease in dark current is obtained by independently engineering the Schottky barrier heights at the anode and cathode. In addition, the use of transparent electrodes enables more light to be coupled into the front-side illuminated MSMPDs thereby increasing the responsivity. For an applied bias of 5 V, these devices exhibited an extremely low dark current density of 21.2 fA/μm2 and a high responsivity of 0.56 A/W to perpendicularly incident 1.31 μm wavelength light.

Original languageEnglish (US)
Pages (from-to)3026-3028
Number of pages3
JournalApplied Physics Letters
Volume70
Issue number22
DOIs
StatePublished - Jun 2 1997

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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