ZnO nanowire transistors.
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.
Goldberger
Josh
J
Sirbuly
Donald J
DJ
Law
Matt
M
Yang
Peidong
P
D053770:Nanowires / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D014173:Transistors, Electronic; D015034:Zinc Oxide / Q000737:chemistry*
D015034:Zinc Oxide