GaN nanostructured p-i-n photodiodes

J. L. Pau, C. Bayram, P. Giedraitis, R. McClintock, M. Razeghi

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

We report the fabrication of nanostructured p-i-n photodiodes based on GaN. Each device comprises arrays of ∼200 nm diameter and 520 nm tall nanopillars on a 1 μm period, fabricated by e-beam lithography. Strong rectifying behavior was obtained with an average reverse current per nanopillar of 5 fA at -5 V. In contrast to conventional GaN diodes, nanostructured devices reproducibly show ideality factors lower than 2. Enhanced tunneling through sidewall surface states is proposed as the responsible mechanism for this behavior. Under backillumination, the quantum efficiency in nanostructured devices is partly limited by the collection efficiency of holes into the nanopillars.

Original languageEnglish (US)
Article number221104
JournalApplied Physics Letters
Volume93
Issue number22
DOIs
StatePublished - Dec 12 2008

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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