Aymen YANGUI, Dr.

Aymen.jpeg Host Laboratory Hirakawa LAB.
Position in LIMMS Postdoctoral Researcher

Main Research Topic in LIMMS

NANOTECH - Novel Cooling Devices based on Quantum Structures


Solid-state refrigeration, MEMS, Quantum structures
Contact LIMMS/CNRS-IIS (UMI 2820)
Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
Phone:+81 (0)3 5452 6261 / Fax:+81 (0)3 5452 6262
E-mail yangui at iis.u-tokyo.ac.jp
Download Abstract2017.pdf 


Short resume :
2016-now JSPS postdoc in LIMMS
2013-2016 PhD student, GEMaC laboratory (UMR-CNRS 8635), University Paris-Saclay, France

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Research Projects in Limms

Context :
In the modern electronics, energy saving and thermal management technologies are becoming extremely important. For example, VLSIs are now approaching their physical limits, because materials cannot tolerate the heat dissipated in the circuits. In addition, energy-efficient cooling technology is also desired because of the environmental concern. Therefore, thermal control has become increasingly important in the designed operation of electronic equipment and the development of new efficient cooling technologies is indispensable for future progress in electronics. In 2005, Chao et al. [1,2] have theoretically proposed a novel cooling device whose operation is based ona concept of “thermionic cooling”. The device structure consists of double barrier resonant tunneling heterostructures. The electron transport in this device is due to resonant tunneling and subsequent thermionic emission. Cold electrons are injected intothe active region by resonant tunneling through an injector potential barrierand subsequently removed from the active region by a thermionic process above a thick potential barrier that works as an extractor barrier (Fig 1). In addition, this extractor barrier serves as a thermal wall to reduce the heat backflow into the active region. This rather simple transport process (cold electron injection and hot electron emission) efficiently removes heat from the quantum well layer and works as a refrigerator.  This semiconductor heterostructure refrigerator can easily be integrated into the modern microelectronic technology and it works efficiently even at room temperature, in contrast to other micro-refrigerators that work only at extremely low temperature less than 1 K.
Fig. 1 Band structure of the thermionic cooling device proposed by hao et al. [1]
Objectives :
Our objective in the present research project is to fabricate this novel thermionic cooling device using semiconductor quantum structures. Furthermore, we will quantitatively characterize the cooling effect by measuring the local temperature of the quantum well cooling layer by using a microelectromechanical (MEMS) thermometer structure recently developed at Hirakawa group.  By doing so, we will demonstrate the effectiveness of this novel solid-state cooling effect.
Methodes :
1) Fabrication of thermionic cooling devices based on GaAs heterostructures using resonant tunneling and thermionic emission
2) Design of the MEMS thermometer
3) Integration of the thermionic cooling device on the MEMS thermometer and characterization of the cooling properties (Fig. 2)                                                                                            

Picture2.jpgFig. 2 Band structure of the thermionic cooling device proposed by Chao et al. [1]


Results :

* Design and Fabrication of the thermionic cooling device based on GaAs heterostructures.

Simulation of the I-V curve of the device.

References :

[1] K. A. Chao et al., Appl. Phys. Lett 87, 022103 (2005)
[2] K. A. Chao et al., Appl. Phys. Lett 89, 153125 (2006)

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Main publication List (papers, conferences and patent)




1. M Bescond, D Logoteta, F Michelini, N Cavassilas, T Yan, A Yangui, M Lannoo and K Hirakawa, Thermionic cooling devices based on resonant-tunneling AlGaAs/GaAs heterostructure, J. Phys.: Condens. Matter 30, 064005 (2018).





1. A. Yangui et al. Control of the white-light emission in the mixed two-dimensional hybrid perovskites (C6H11NH3)2[PbBr4-xIx]. J. Alloys. Compd. 699, 1122-1133 (2017). 

  1. A. YanguiM. Bescond, and K. Hirakawa.: “Efficient Room Temperature Cooling Devices Based On Thermionic emission,” Workshop on Innovative Nanoscale Devices and Systems (WINDS), Hawaii, USA, November 26-December 1 (2017). 
  2. A. Yangui, M. Bescond, and K. Hirakawa.: “Thermionic Cooling Devices Based On AlGaAs/GaAs Heterostructures,” International Conference on Functional Materials ICFM 2017, Hammamet, Tunisia, September 05-09 (2017). 


2016 and prior

  1. A. Yangui et al. Rapid and robust spatiotemporal dynamics of the first-order phase transition in crystals of the organic-inorganic perovskite (C12H25NH3 )2PbI4. Scient. Rep. 5, 16634 (2015).

  2. A. Yangui et al. Optical Investigation of Broadband White-Light Emission in Self-Assembled Organic-Inorganic Perovskite (C6H11NH3)2PbBr4. J. Phys. Chem. C. 119(41) (2015).

  3. A. Yangui et al. Structural phase transition causing anomalous photoluminescence behavior in the perovskite (C6H11NH3)2[PbI4]. J. Chem. Phys. 143(22), 224201 (2015). 

  4. A. Yangui et al. Second-order phase transition in the (C6H11NH3)2[PbI4] organic-inorganic material. J. Appl. Phys. 117, 115503 (2015).

  5. H. Dammak, A. Yangui, S. Triki, Y. Abid, H. Feki. Structural characterization, vibrational, optical properties and DFT investigation of a new luminescent organic-inorganic material: (C6H14N)3Bi2I9. J. Lumin. 161, 214-220 (2015). 

  6. A.  Yangui et al. ActaCrystallogr. Sect. E: Cryst. Struct. Commun. 70, 227–228 (2014) . 


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