[8p-Z10-1~11] 13.6 ナノ構造・量子現象・ナノ量子デバイス

▲ [8p-Z10-1] [Highlight]Electron and lattice cooling in thermionic emission heterostructures with tilted barriers

〇Marc Bescond¹、Aymen Yangui¹、Xiangyu Zhu²、Naomi Nagai²、Kazuhiko Hirakawa^2,1 (1.LIMMS/CNRS-IIS, Univ. of Tokyo、2.IIS and INQIE, Univ. of Tokyo)

キーワード：Thermionic and evaporative cooling, Double-barrier heterostructure, Quantum transport

We focus on innovative highly efficient thermionic cooling nano-devices. It is motivated by the urgent technological need to control joule heating in nanoelectronics in a context of energy shortage. We first study both theoretically and experimentally a double-barrier asymmetric hetero-structure and demonstrate that such device can efficiently acts on both electronic and phononic bath’s refrigeration. A remarkable electron refrigeration of 50 K, thanks to an evaporative cooling effect, is analyzed. We then introduce an original refrigeration device with a tilted potential barrier, and discuss the improvement of performances. Our results show that the present semiconductor heterostructure can lead to thermionic devices of crucial technological interest, providing a higher efficiency and a larger cooling power.