Bottom-Up (Cu, Ag, Au)/Al2O3/Bi2Te3 Assembled Thermoelectric Heterostructures

Abstract

The interface affects the transmission behavior of electrons and phonons, which in turn determines the performance of thermoelectric materials. In this paper, metals (Cu, Ag, Au)/Al2O3/Bi2Te3 heterostructures have been fabricated from bottom to up to optimize the thermoelectric power factor. The introducing metals can be alloyed with Bi2Te3 or form interstitials or dopants to adjust the carrier concentration and mobility. In addition, the metal-semiconductor interface as well as the metal-insulator-semiconductor interface constructed by the introduced metal and Al2O3 would further participate in the regulation of the carrier transport process. By adjusting the metal and oxide layer, it is possible to realize the simultaneous optimization of electric conductivity and Seebeck coefficient. This work will enable the optimal and novel design of heterostructures for thermoelectric materials with further improved performance.

Thermoelectric Properties of CrS2–xTex (x: 0, 1, 2) Dichalcogenides Monolayers: First-Principles Study

“…There are various strategies to enhance the thermoelectric performance of the TMDCs monolayer, including functionalization, substitutional doping, and external field. For example, researchers have proposed 2D materials and 2D van der Waals heterostructures for thermoelectric applications. , Identifying a promising material with a high thermoelectric efficiency is still a challenge despite the various attempts to predict such materials through both theoretical and experimental means. This article focuses on the electronic and thermoelectric properties of CrS 2 , CrSTe, and CrTe 2 monolayers [see Figure (a–c)].…”

Electronic Structure and Transport Properties of Bi2Te3 and Bi2Se3 Single Crystals

“…This, in turn, can be used in various devices. Due to their special surface states, Bi 2 Te 3 and Bi 2 Se 3 have great application potential and are successfully used in spintronic [15][16][17][18] and thermoelectronic [19][20][21][22][23] devices, biological and chemical sensors [24][25][26], and photonic and optoelectric applications [27,28]. Therefore, obtaining new information about the features of the electronic structure and electronic transport in such topological materials is of great interest and is relevant from both fundamental and applied points of view.…”