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- Title
Statistical Piezotronic Effect in Nanocrystal Bulk by Anisotropic Geometry Control.
- Authors
Liu, Shuhai; Han, Ming; Feng, Xiaolong; Yu, Qiuhong; Gu, Long; Wang, Longfei; Qin, Yong; Wang, Zhong Lin
- Abstract
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 µS 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.A statistical piezotronic effect is proposed in ZnO bulk composed of c‐axis preferentially oriented nanoplatelets. It is a statistical phenomenon of piezotronic modification of large numbers of interfaces. High sensitivity and gauge factor at a high‐pressure range of 200–400 MPa are achieved in the ZnO bulk. The statistical piezotronic effect extends the connotation of piezotronics and promotes its practical applications.
- Publication
Advanced Functional Materials, 2021, Vol 31, Issue 14, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202010339