Supersensitive, Fast-Response Nanowire Sensors by Using Schottky Contacts

Youfan Hu, Jun Zhou, Ping-Hung Yeh, Zhou Li, Te-Yu Wei, Zhong Lin Wang

Research output: Contribution to journalArticlepeer-review

279 Scopus citations

Abstract

A Schottky barrier can be formed at the interface between a metal electrode and a semiconductor. The current passing through the metal-semiconductor contact is mainly controlled by the barrier height and barrier width. In conventional nanodevices, Schottky contacts are usually avoided in order to enhance the contribution made by the nanowires or nanotubes to the detected signal. We present a key idea of using the Schottky contact to achieve supersensitive and fast response nanowire-based nanosensors. We have illustrated this idea on several platforms: UV sensors, biosensors, and gas sensors. The gigantic enhancement in sensitivity of up to 5 orders of magnitude shows that an effective usage of the Schottky contact can be very beneficial to the sensitivity of nanosensors. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish (US)
Pages (from-to)3327-3332
Number of pages6
JournalAdvanced Materials
Volume22
Issue number30
DOIs
StatePublished - May 31 2010
Externally publishedYes

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