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Issue 27, 2015
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Effects of a ferroelectric interface on thermionic injection-induced cooling in single-heterojunction devices based on thin-film electrode/medium/electrode design

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Abstract

This paper reports experimental studies on the effects of a ferroelectric interface on thermionic cooling in single-heterojunction electrode/medium/electrode thin-film devices by using high-dielectric MoO3 oxide and a ferroelectric P(VDF-TrFE) polymer. We observe a thermionic cooling of 0.10 °C from the single Au/MoO3/ITO device at a low injection current of 0.50 mA cm−2. The experimental studies at different film thicknesses and current densities suggest that this cooling effect is determined by three competing processes: phonon absorption from injected carriers through a thermionic process via charge–phonon interactions, Joule heating from the electrical transport of injected carriers, and heat transfer between charge-injecting and charge-collecting electrodes through phonon conduction. Furthermore, we find that inserting a ferroelectric polymer [P(VDF-TrFE)] interface can largely enhance the thermionic cooling from 0.10 °C to 0.20 °C by a factor of 2 in the Au/P(VDF-TrFE)/MoO3/ITO device at a very low injection current of 0.15 mA cm−2, as compared with the Au/MoO3/ITO device without a ferroelectric interface. Our analysis indicates that the ferroelectric P(VDF-TrFE) interface can decrease the heat transfer between charge-injecting and charge-collecting electrodes due to its low thermal conductivity but still allow a thermionic injection due to its ferroelectric polarization to enhance the cooling effect. Therefore, our work presents a new approach to enhance the thermionic cooling effect by using a ferroelectric interface in organic heterojunction thin-film electronic devices.

Graphical abstract: Effects of a ferroelectric interface on thermionic injection-induced cooling in single-heterojunction devices based on thin-film electrode/medium/electrode design

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Article information


Submitted
14 Apr 2015
Accepted
05 Jun 2015
First published
05 Jun 2015

J. Mater. Chem. A, 2015,3, 14431-14437
Article type
Paper

Effects of a ferroelectric interface on thermionic injection-induced cooling in single-heterojunction devices based on thin-film electrode/medium/electrode design

Q. Liu, T. Wu, Y. Hsiao, M. Li, D. Hu, H. Wang, H. Xu, J. Tisdale and B. Hu, J. Mater. Chem. A, 2015, 3, 14431
DOI: 10.1039/C5TA02712H

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