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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Thursday, 10 November 2016
(at 13:00 in room 115, Hallwachsstr. 3)
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Thermal Transistor Based on the Hysteresis of VO_2

Jose Ordonez-Miranda

Centre National de la Recherche Scientifique, Institute Pprime, France

Guiding, amplification, and control of electrical and thermal currents are of critical importance to efficiently manage the energy resources present in nature. In electricity, this has been done with diodes and transistors, which have allowed the development of almost all modern electronics, while the conception of the thermal diode/transistor has recently emerged. These fundamental thermal devices are based on the dielectric-metal transition of phase change materials (PCMs) and were reported to provide fine control on heat currents, however up to date, not so much attention has been put neither on the intrinsic thermal hysteresis of PCMs nor on temperature control, which are considered in the present work.
The objective of this talk is to theoretically demonstrate that a thermal transistor with a PCM base can be used as a thermal device for heating and cooling. This is done by exploiting the effect of the PCM thermal hysteresis on the heat fluxes that the base exchanges with the collector and emitter of the transistor. Based on the principle of energy conservation, we show that these heat fluxes and the base temperature undergo significant jumps under a small modification of the heat flux applied to the base. When the collector and emitter of the transistor operate at 350 K and 300 K, respectively, a temperature jump of +18 K (-5 K) and a coefficient of performance of 58% (32%) are obtained during the heating (cooling) of a VO2 base excited with 208 Wm -2 (63 Wm -2 ). This sizeable thermal effect is dominated by the photon heat current and could provide an alternative and/or complement to the present refrigeration and heating technologies involved in freezers, microwave ovens, and radiators used at home.

Announcement (pdf)

Brief Bio:

Jose Ordonez is a CNRS researcher at the Institute Pprime in Futuroscope, France. His research area is the transport of heat by phonons, photons, electrons, and polaritons propagating in nanomaterials with applications in thermotronics. The Boltzmann transport equation and Maxwell's equations of electromagnetism are his main tools of theoretical modeling. He obtained his bachelor degree in applied physics at the National University Jorge Basadre Grohmann in Tacna, Peru and received his Master in Physics from CINVESTAV in Merida, Mexico. Jose holds a Ph.D. degree in physics granted by CINVESTAV and the University of Boulder in Colorado, USA. He performed a postdoc in the laboratory EM2C at the Ecole Centrale Paris, and was recruited by the CNRS in October 2015, for which he currently works as a full researcher. As a result of his research activities, since he began his Ph.D. studies in 2008, Jose has published 46 scientific papers and one book chapter. His Ph.D. thesis has been recognized by CINVESTAV and UNAM as the best doctoral thesis in sciences and materials sciences of Mexico in 2011, respectively. In addition, he was awarded the prize of outstanding young researcher granted by the International Society of photothermal phenomena, in 2014, in Shanghai, China.

Invited by G. Cuniberti

Within the nanoSeminar

last modified: 2021.10.21 Thu
author: webadmin