Journal
SENSORS
Volume 12, Issue 1, Pages 534-548Publisher
MDPI AG
DOI: 10.3390/s120100534
Keywords
pyroelectricity; thermal energy; temperature variation rate; electrode
Funding
- National Science Council of Taiwan [NSC 100-2221-E-150-048]
- Common Lab for Micro/Nano Science and Technology at the National Formosa University
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This study proposes trenching piezoelectric (PZT) material in a thicker PZT pyroelectric cell to improve the temperature variation rate to enhance the efficiency of thermal energy-harvesting conversion by pyroelectricity. A thicker pyroelectric cell is beneficial in generating electricity pyroelectrically, but it hinders rapid temperature variations. Therefore, the PZT sheet was fabricated to produce deeper trenches to cause lateral temperature gradients induced by the trenched electrode, enhancing the temperature variation rate under homogeneous heat irradiation. When the trenched electrode type with an electrode width of 200 mu m and a cutting depth of 150 mu m was used to fabricate a PZT pyroelectric cell with a 200 mu m thick PZT sheet, the temperature variation rate was improved by about 55%. Therefore, the trenched electrode design did indeed enhance the temperature variation rate and the efficiency of pyroelectric energy converters.
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