%0 Journal Article
%A Wang, Longfei
%A Liu, Shuhai
%A Feng, Xiaolong
%A Xu, Qi
%A Bai, Suo
%A Zhu, Laipan
%A Chen, Libo
%A Qin, Yong
%A Wang, Zhong Lin
%D 2017
%T Ultrasensitive Vertical Piezotronic Transistor Based
on ZnO Twin Nanoplatelet
%U https://acs.figshare.com/articles/journal_contribution/Ultrasensitive_Vertical_Piezotronic_Transistor_Based_on_ZnO_Twin_Nanoplatelet/4884455
%R 10.1021/acsnano.7b01374.s001
%2 https://ndownloader.figshare.com/files/8195555
%K pressure sensitivity
%K Ultrasensitive Vertical Piezotronic Transistor
%K Schottky barrier heights
%K TNPT
%K two-terminal piezotronic transistor
%K future generations
%K polarization charges
%K response time
%K sensor
%K interface
%K UV photodetectors
%K device exhibits
%K health monitoring
%K nanoplatelet
%K piezotronic effect
%K carrier transport
%K ZnO Twin Nanoplatelet High sensitivity
%K AW
%X High
sensitivity of pressure/strain sensors is the key to accurately
evaluating external mechanical stimuli and could become more important
in future generations of human–machine interfaces and artificial
skin. Here we report the study of a two-terminal piezotronic transistor
based on ZnO twin nanoplatelets (TNPT). Owing to the mirror symmetrical
structure of ZnO twin nanplatelet, compressive pressure-induced positive
piezoelectric polarization charges created at both metal–semiconductor
interfaces can simultaneously lower both Schottky barrier heights
and thus significantly modulate the carrier transport. Our device
exhibits the highest pressure sensitivity of 1448.08–1677.53
meV/MPa, which is more than ∼20 times larger than the highest
value reported previously, and a fast response time of <5 ms. In
addition, it can be used as a photodector with an ultrahigh external
photoresponsivity of ∼1.45 × 104 AW–1, which is ∼105 times larger in magnitude than
that of commercial UV photodetectors. The coupling between the mirror
symmetrical structure and strong piezotronic effect in ZnO twin nanoplatelets
may enable the development of ultrasensitive pressure/strain sensors
for various applications such as artificial skin, health monitoring,
and adaptive biomedical probes.
%I ACS Publications