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Flexible piezoelectric nanogenerators based on a transferred ZnO nanorod/Si micro-pillar array

Title
Flexible piezoelectric nanogenerators based on a transferred ZnO nanorod/Si micro-pillar array
Author(s)
Baek, Seong HoPark, Il Kyu
Issued Date
2017-03
Citation
Nanotechnology, v.28, no.9
Type
Article
Author Keywords
ZnO nanorodsnanogeneratorflexibletouch sensor
Keywords
NANOWIRE ARRAYSSOLAR-CELLSLAYER
ISSN
0957-4484
Abstract
Flexible piezoelectric nanogenerators (PNGs) based on a composite of ZnO nanorods (NRs) and an array of Si micro-pillars (MPs) are demonstrated by a transfer process. The flexible composite structure was fabricated by hydrothermal growth of ZnO NRs on an electrochemically etched Si MP array with various lengths followed by mechanically delaminating the Si MP arrays from the Si substrate after embedding them in a polydimethylsiloxane matrix. Because the Si MP arrays act as a supporter to connect the ZnO NRs electrically and mechanically, verified by capacitance measurement, the output voltage from the flexible PNGs increased systematically with the increased density ZnO NRs depending on the length of the Si MPs. The flexible PNGs showed 3.2 times higher output voltage with a small change in current with increasing Si MP length from 5 to 20 μm. The enhancement of the output voltage is due to the increased number of series-connected ZnO NRs and the beneficial effect of a ZnO NR/Si MP heterojunction on reducing free charge screening effects. The flexible PNGs can be attached on fingers as a wearable electrical power source or motion sensor. © 2017 IOP Publishing Ltd.
URI
http://hdl.handle.net/20.500.11750/2096
DOI
10.1088/1361-6528/aa58ee
Publisher
Institute of Physics Publishing
Related Researcher
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Division of Energy & Environmental Technology 1. Journal Articles

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