Journal
NANO LETTERS
Volume 4, Issue 4, Pages 651-657Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl0498536
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We demonstrate seamless direct integration of a semiconductor nanowire grown using a bottom-up approach to obtain a vertical field-effect transistor (VFET), We first synthesize single crystalline semiconductor indium oxide (In2O3) nanowires projecting vertically and uniformly on a nonconducting optical sapphire substrate. Direct electrical contact to the nanowires is uniquely provided by a self-assembled underlying ln(2)O(3) buffer layer formed in-situ during the nanowire growth. A controlled time-resolved growth study reveals dynamic simultaneous nucleation and epitaxial growth events, driven by two competitive growth mechanisms. Based on the nanowire-integrated platform, a depletion mode n-channel VFET with an In2O3 nanowire constituting the active channel is fabricated. Our unique vertical device architecture could potentially lead to tera-level ultrahigh-density nanoscale electronic, and optoelectronic devices.
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