Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 109, Issue 1, Pages 9-14Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp0452599
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Funding
- Directorate For Engineering [0832819] Funding Source: National Science Foundation
- Div Of Engineering Education and Centers [0832819] Funding Source: National Science Foundation
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ZnO nanowire field-effect transistors (FETs) were fabricated and studied in vacuum and a variety of ambient gases from 5 to 300 K. In air, these n-type nanowire transistors have among the highest mobilities yet reported for ZnO FETs (mu(e) = 13 +/- 5 cm(2) V-1 s(-1)), with carrier concentrations averaging 5.2 +/- 2.5 x 10(17) cm(-3) and on-off current ratios ranging from 10(5) to 10(7). Four probe measurements show that the resistivity of the Ti/Au-ZnO contacts is 0.002-0.02 Omega-cm. The performance characteristics of the nanowire transistors are intimately tied to the presence and nature of adsorbed surface species. In addition, we describe a dynamic gate effect that seems to involve mobile surface charges and causes hysteresis in the transconductance, among other effects.
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