Research of the Co3O4/ZnO p-n Type Piezoelectric Transducers
Date Issued
2013
Date
2013
Author(s)
Lee, Tsung-Han
Abstract
Enabling technologies for wireless sensor networks have gained considerable attention in research communities over the past few years. With the development of the low powered small wireless electronic devices, it is highly desirable, even necessary in certain situations, for wireless sensor nodes to be self-powered.
This research develops a ZnO piezoelectric transducers that can be operated in low frequency. A ZnO films and Co3O4 films were well-deposited on flexible titanium (Ti) foil of 80 μm and ZnO/Ti structure. The ZnO deposited on Ti foil performed a best piezoelectric coefficient at the specific sputtering parameters, and showed a good textured structure via XRD, SEM, EDS and AFM measurements.
However, we utilize n-type zinc oxide (ZnO) and p-type cobalt oxide (Co3O4) to develop a p-n type piezoelectric transducers. The Co3O4-ZnO interface forms a p-n junction. When two capacitors are connected in series, their overall capacitance is less than that of either. It can reduce the impedance to enhance the output voltage. Also, it can increase the difference in Fermi levels between two electrodes. This structure enhances the output power efficiently. From the experiment results, the output voltage and power of the p-n type piezoelectric transducer is around 1.5 times and 10.6 times of ZnO piezoelectric transducers at the same strain respectively.
Subjects
壓電材料
壓電換能器
氧化鋅
氧化鈷
p-n接面
Type
thesis
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