Enhanced Performance of Dispenser Printed MA n-type Bi₂Te₃ Composite Thermoelectric Generators
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2012-11-07
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Madan, D.; Wang, Z.; Chen, A.; Juang, R.-c.; Keist, J.; Wright, P. K.; Evans, J. W. Enhanced Performance of Dispenser Printed MA ntype Bi2Te3 Composite Thermoelectric Generators. ACS Appl. Mater. Interfaces 4 (7 November 2012): 6117-6124. https://doi.org/10.1021/am301759a.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
This work presents performance advancements of dispenser printed composite thermoelectric materials and devices. Dispenser printed thick films allow for low-cost and scalable manufacturing of microscale energy harvesting devices. A maximum ZT value of 0.31 has been achieved for mechanically alloyed (MA) n-type Bi2Te3-epoxy composite films with 1 wt % Se cured at 350 °C. The enhancement of ZT is a result of increase in the electrical conductivity through the addition of Se, which ultimately lowers the sintering temperature (350 °C). A 62 single-leg thermoelectric generator (TEG) prototype with 5 mm ×700 μm × 120 μm printed element dimensions was fabricated on a custom designed polyimide substrate with thick metal contacts. The prototype device produced a power output of 25 μW at 0.23 mA current and 109 mV voltage for a temperature difference of 20 °C, which is sufficient for low power generation for autonomous microsystem applications.