掺杂Cd元素协同优化Sb_(2)Te_(3)(SnTe)_(6)的热电输运性能  

Synergistic optimization of thermoelectric transport properties in Sb_(2)Te_(3)(SnTe)_(6)through Cd doping

作　　者：刘雨晴 崔金华 王淑芳[1] 钱鑫 Yuqing Liu;Jinhua Cui;Shu-Fang Wang;Xin Qian(Hebei Key Lab of Optic-Electronic Information and Materials,College of Physics Science and Technology,Hebei University,Baoding 071002,China)

机构地区：[1]河北大学物理科学与技术学院,河北省光电信息材料重点实验室,保定071002

出　　处：《科学通报》2025年第6期729-736,共8页Chinese Science Bulletin

基　　金：国家自然科学基金(52102234);河北省教育厅科学研究项目(QN2024263);河北大学高层次人才科研启动项目(521000981421);河北省光电信息材料实验室绩效补贴基金(22567634H)资助。

摘　　要：环境友好型的热电材料碲化锡(SnTe)因不含有毒元素铅(Pb)而受到广泛关注和研究.由于其具有极高的载流子浓度,尽管在中高温区表现出较高的热电性能,但其近室温区的热电性能很难提升.随着热电制冷技术的发展,材料在近室温区的热电性能显得更加重要.之前的研究表明,合金化Sb_(2)Te_(3)可以引入大量的阳离子空位和位错缺陷,能有效抑制SnTe的晶格热导率,同时还可以调控其能带结构增大有效质量,是提高其宽温域热电性能的有效策略.本研究在合金化Sb_(2)Te_(3)的基础上,通过在Sn位掺杂Cd元素,协同调控了Sb_(2)Te_(3)(SnTe)_(6)的载流子浓度、态密度有效质量和晶格热导率.最终Sb_(2)Te_(3)(Sn_(0.96)Cd_(0.04)Te)_(6)在300 K的ZT值达到了0.26,323~773 K温度范围内的平均ZT值达到了0.79,表明SnTe-Sb_(2)Te_(3)化合物在热电发电和制冷领域具有重要的应用潜力.Under the background of a worsening energy crisis,there is an increasing global demand for efficient and environmentally friendly energy conversion methods.Thermoelectric materials,which are capable of bidirectional conversion between thermal energy and electrical energy,show significant potential for applications in waste heat utilization and solid-state refrigeration technology.Thermoelectric materials offer innovative solutions to the current energy shortage.SnTe and PbTe share the same crystal structure and similar two-valence-band structure,but SnTe does not contain the toxic element Pb,has attracted great attention and research interest.Despite exhibiting relatively high thermoelectric performance in the medium to high-temperature range,enhancing the thermoelectric performance of SnTe near room temperature poses a challenge primarily due to its excessively high carrier concentration and low Seebeck coefficient.As the advancement of thermoelectric cooling technology continues,the performance of materials at room temperature becomes increasingly crucial.Previous studies have demonstrated that alloying with Sb_(2)Te_(3) introduces a significant number of cation vacancies and dislocation defects,effectively reducing the lattice thermal conductivity of SnTe.This process also enables the modulation of the band structure,thereby increasing the effective mass,which has been demonstrated as a successful strategy for enhancing thermoelectric performance across a broad temperature range.Relevant research indicates that Sb_(2)Te_(3)(SnTe)_(6)exhibits superior room temperature thermoelectric performance and average thermoelectric performance compared to other alloyed samples.Therefore based on the Sb_(2)Te_(3) alloying approach,this study incorporates Cd doping at the Sn site to synergistically regulate the carrier concentration,density of states effective mass,and lattice thermal conductivity of Sb_(2)Te_(3)(SnTe)_(6).Thermoelectric materials,Sb_(2)Te_(3)(Sn1−xCdxTe)6(x=0–0.08)were synthesized by vacuum melting and

关 键 词：热电材料 载流子浓度 有效质量 晶格热导率 热电性能 

分 类 号：TB34[一般工业技术—材料科学与工程]