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Gate- and Light-Tunable pn Heterojunction Microwire Arrays Fabricated via Evaporative Assembly
journal contribution
posted on 2016-12-29, 00:00 authored by Jae Hoon Park, Jong Su Kim, Young Jin Choi, Wi Hyoung Lee, Dong Yun Lee, Jeong Ho ChoOne-dimensional (1D)
nano/microwires have attracted considerable attention as versatile
building blocks for use in diverse electronic, optoelectronic, and
magnetic device applications. The large-area assembly of nano/microwires
at desired positions presents a significant challenge for developing
high-density electronic devices. Here, we demonstrated the fabrication
of cross-stacked pn heterojunction diode arrays by integrating well-aligned
inorganic and organic microwires fabricated via evaporative assembly.
We utilized solution-processed n-type inorganic indium–gallium–zinc-oxide
(IGZO) microwires and p-type organic 6,13-bis(triisopropylsilylethynyl)pentacene
(TIPS-PEN) microwires. The formation of organic TIPS-PEN semiconductor
microwire and their electrical properties were optimized by controlling
both the amounts of added insulating polymer and the widths of the
microwires. The resulting cross-stacked IGZO/TIPS-PEN microwire pn
heterojunction devices exhibited rectifying behavior with a forward-to-reverse
bias current ratio exceeding 102. The ultrathin nature
of the underlying n-type IGZO microwires yielded gate tunability in
the charge transport behaviors, ranging from insulating to rectifying.
The rectifying behaviors of the heterojunction devices could be modulated
by controlling the optical power of the irradiated light. The fabrication
of semiconducting microwires through evaporative assembly provides
a facile and reliable approach to patterning or positioning 1D microwires
for the fabrication of future flexible large-area electronics.
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cross-stacked pn heterojunction diode arrayscharge transport behaviors10 2gate tunabilitysemiconducting microwiresforward-to-reverse biasultrathin naturebuilding blocksLight-Tunable pn Heterojunction Microwire Arrays Fabricatedn-type IGZO microwires1 D microwiresdevice applicationsheterojunction devicessolution-processed n-typeTIPS-PEN semiconductor microwire
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