Journal
NANO LETTERS
Volume 9, Issue 10, Pages 3435-3439Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl901606b
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Funding
- China Scholarship Council (CSC) [220073020]
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We report an external force triggered field-effect based on a free-standing piezoelectric fine wire (PFW). The device consists of an Ag source electrode and an Au drain electrode at two ends of a ZnO PFW, which were separated by an insulating polydimethylsiloxane (PDMS) thin layer. The working principle of the sensor Is proposed based on the piezoelectric potential gating effect. Once subjected to a mechanical impact, the bent ZnO PFW cantilever creates a piezoelectric potential distribution across It width at Its root and simultaneously produces a local reverse depletion layer with much higher donor concentration than normal, which can dramatically change the current flowing from the source electrode to drain electrode when the device is under a fixed voltage bias, Due to the free-standing structure of the sensor device, it has a prompt response time less than 20 ms and quite high and stable sensitivity of 2%/mu N. The effect from contact resistance has been ruled out.
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