All-Inorganic Halide Perovskites Boost High-Ranged Figure-of-Merit in Bi<sub>0.4</sub>Sb<sub>1.6</sub>Te<sub>3</sub> for Thermoelectric Cooling and Low-Grade Heat Recovery
Kangpeng Jin, Zhiya Yang, Liangwei Fu, Yue Lou, Pengfei Xu, Ming Huang, Zhan Shi, Biao Xu
Abstract
The all-inorganic halide perovskite CsPbX 3 (X = Cl, Br, or I) offers various advantages, such as tunable electronic structure and high carrier mobility. However, its potential application in thermoelectric materials remains underexplored. In this study, we propose a simple yet effective method to synthesize a CsPbX 3 /Bi 0.4 Sb 1.6 Te 3 (BST) nanocomposite by sintering a uniformly mixed raw powder. The intrinsic excitation of the BST system is suppressed by exploiting the rich phase structure and tunable electrical transport properties of CsPbX 3, and the thermoelectric properties were synergistically optimized. Notably, for CsPbI 3, its phase-transition-induced dislocation arrays together with low group velocities drastically reduce thermal conductivity. As a result, the composite achieves an ultrahigh average figure-of-merit ( ZT ) of 1.4 from 298 to 523 K. The two-pair TE module demonstrates a superior conversion efficiency of 7.3%. This study expands the potential applications of inorganic halide perovskites, into thermoelectrics.