Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 17, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202010339
Keywords
mechanical gating; piezoelectric effect; piezotronic effect; statistical distribution; ZnO nanoplatelets
Categories
Funding
- National Key R&D Project from Minister of Science and Technology [2016YFA0202704]
- National Natural Science Foundation of China [51472111, 51432005, 5151101243, 51561145021]
- Natural Science Basic Research Plan in Shaanxi Province of China [2019JQ-652]
- National Program for Support of Top-notch Young Professionals
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The statistical piezotronic effect was reported in ZnO bulk, showing that strain-induced piezo-potential at crystal interfaces can effectively control electrical transport. The crystal orientation of inner ZnO nanoplatelets strongly influences ZnO bulk's transport properties and conductivity can be increased with optimum nanoplatelet orientation under high pressure.
Utilizing inner-crystal piezoelectric polarization charges to control carrier transport across a metal-semiconductor or semiconductor-semiconductor interface, piezotronic effect has great potential applications in smart micro/nano-electromechanical system (MEMS/NEMS), human-machine interfacing, and nanorobotics. However, current research on piezotronics has mainly focused on systems with only one or rather limited interfaces. Here, the statistical piezotronic effect is reported in ZnO bulk composited of nanoplatelets, of which the strain/stress-induced piezo-potential at the crystals' interfaces can effectively gate the electrical transport of ZnO bulk. It is a statistical phenomenon of piezotronic modification of large numbers of interfaces, and the crystal orientation of inner ZnO nanoplatelets strongly influence the transport property of ZnO bulk. With optimum preferred orientation of ZnO nanoplatelets, the bulk exhibits an increased conductivity with decreasing stress at a high pressure range of 200-400 MPa, which has not been observed previously in bulk. A maximum sensitivity of 1.149 mu S m(-1) MPa-1 and a corresponding gauge factor of 467-589 have been achieved. As a statistical phenomenon of many piezotronic interfaces modulation, the proposed statistical piezotronic effect extends the connotation of piezotronics and promotes its practical applications in intelligent sensing.
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