High Carrier Mobility and Promising Thermoelectric Module Performance of N‐Type PbSe Crystals

Author:

Wang Siqi1,Wen Yi1,Zhu Yingcai1,Wang Ziyuan2,Liu Dongrui1,Zheng Junqing1,Zhan Shaoping1,Xie Hongyao1,Ge Zhenhua2,Gao Xiang3,Cao Qian4,Chang Cheng1ORCID,Zhao Li‐Dong1

Affiliation:

1. School of Materials Science and Engineering Beihang University Beijing 100191 China

2. Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 China

3. Center for High Pressure Science and Technology Advanced Research (HPSTAR) Beijing 100094 China

4. Huabei Cooling Device Co. Ltd. Hebei 065400 China

Abstract

AbstractThe scarcity of Te hampers the widespread use of Bi2Te3‐based thermoelectric modules. Here, the thermoelectric module potential of PbSe is investigated by improving its carrier mobility. Initially, large PbSe crystals are grown with the temperature gradient method to mitigate grain boundary effects on carrier transport. Subsequently, light doping with <1mole‰ halogens (Cl/Br/I) increases room‐temperature carrier mobility to ~1600 cm2 V−1 s−1, achieved by reducing carrier concentration compared to traditional heavy doping. Crystal growth design and light doping enhance carrier mobility without affecting effective mass, resulting in a high power factor ~40 µW cm−1 K−2 in PbSe‐Cl/Br/I crystals at 300 K. Additionally, Cl/Br/I doping reduces thermal conductivity and bipolar diffusion, leading to significantly lower thermal conductivity at high temperature. Enhanced carrier mobility and suppressed bipolar effect boost ZT values across the entire temperature range in n‐type PbSe‐Cl/Br/I crystals. Specifically, ZT values of PbSe‐Br crystal reach ~0.6 at 300 K, ~1.2 at 773 K, and the average ZT (ZTave) reaches ~1.0 at 300–773 K. Ultimately, ~5.8% power generation efficiency in a PbSe single leg with a maximum temperature cooling difference of 40 K with 7‐pair modules is achieved. These results indicate the potential for cost‐effective and high‐performance thermoelectric cooling modules based on PbSe.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Beijing Municipality

Higher Education Discipline Innovation Project

National Science Fund for Distinguished Young Scholars

China Postdoctoral Science Foundation

Publisher

Wiley

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