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High thermoelectric efficiency realized in SnSe crystals via structural modulation
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Journal Article
High thermoelectric efficiency realized in SnSe crystals via structural modulation
2023
Overview
Crystalline thermoelectrics have been developed to be potential candidates for power generation and electronic cooling, among which SnSe crystals are becoming the most representative. Herein, we realize high-performance SnSe crystals with promising efficiency through a structural modulation strategy. By alloying strontium at Sn sites, we modify the crystal structure and facilitate the multiband synglisis in p-type SnSe, favoring the optimization of interactive parameters
μ
and
m
*
. Resultantly, we obtain a significantly enhanced
PF
~85 μW cm
−1
K
−2
, with an ultrahigh
ZT
~1.4 at 300 K and
ZT
ave
~2.0 among 300–673 K. Moreover, the excellent properties lead to single-leg device efficiency of ~8.9% under a temperature difference
ΔT
~300 K, showing superiority among the current low- to mid-temperature thermoelectrics, with an enhanced cooling Δ
T
max
of ~50.4 K in the 7-pair thermoelectric device. Our study further advances p-type SnSe crystals for practical waste heat recovery and electronic cooling.
Thermoelectric technology directly enables both power generation and electronic cooling. Here, the authors realize high-performance SnSe crystals with promising device efficiencies by modulating crystal and band structures.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
