Cl掺杂提升N-PbS热电性能的实验研究  

Experimental Study on the Improvement of Thermoelectric Performance of N-PbS Through Cl Doping

作　　者：李奕怀[1,2,3] 李金龙 何志远 王元元[1,2,3] 吴子华[1,2,3] 谢华清[1,2,3] LI Yihuai;LI Jinlong;HE Zhiyuan;WANG Yuanyuan;WU Zihua;XIE Huaqing(School of Energy and Materials,Shanghai Polytechnic University,Shanghai 201209,China;Shanghai Engineering Research Center of Advanced Thermal Functional Materials,Shanghai Polytechnic University,Shanghai 201209,China;Shanghai Thermophysical Properties Big Data Professional Technical Service Platform,Shanghai Polytechnic University,Shanghai 201209,China)

机构地区：[1]上海第二工业大学能源与材料学院,上海201209 [2]上海第二工业大学上海先进热功能材料工程技术研究中心,上海201209 [3]上海第二工业大学上海市热物性大数据专业技术服务平台,上海201209

出　　处：《上海第二工业大学学报》2023年第4期290-298,共9页Journal of Shanghai Polytechnic University

基　　金：国家自然科学基金(52176081,51876111);上海先进热功能材料工程技术研究中心(20DZ2253100);上海市专业技术服务平台(22DZ2291100)资助。

摘　　要：铅基硫属化合物在中高温热电领域具有广泛的应用。相较于Te和Se元素,S元素具有含量丰富,价格低廉,且PbS热稳定性高等优点,近年来PbS热电材料引起了研究人员的广泛兴趣。然而,PbS热电材料本体固有高晶格热导率,导致其较低的热电转化效率,严重限制了其在热电领域的应用。为了降低其晶格热导率,采用Cl掺杂方法改善PbS的热电性能。实验结果表明,通过水热法制备了形貌可控的树枝状PbS基纳米材料,在烧结过程中形成了多孔结构PbS基块体材料。通过测试结果可知,Cl掺杂后的多孔PbS材料的致密度和晶格热导率显著降低,载流子浓度升高,热电性能明显改善,其中PbCl_(0.02)S_(0.98)材料在773 K时zT值达到0.71,较纯PbS提升了约108.8%。Lead-based sulfur compounds have been widely used in middle-and high-temperature thermoelectric fields.Compared with Te and Se,S element has the advantages of abundant content,low price,and high thermal stability of PbS,and thus PbS thermoelectric materials have attracted extensive interest of researchers in recent years.However,the inherent high lattice thermal conductivity of PbS thermoelectric material leads to its low thermoelectric conversion efficiency,which severely limits its application in the field of thermoelectric.In order to reduce the lattice thermal conductivity,Cl doping method was used to improve the thermoelectric properties of PbS.The experimental results show that dendritic PbS-based nanomaterials with controllable morphology were prepared by hydrothermal method,and porous PbS-based bulk materials were formed during sintering.The results showed that the density and lattice thermal conductivity of porous PbS materials doped with Cl were significantly reduced,the carrier concentration was increased,and the thermoelectric properties were significantly improved.The zT value of PbCl0.02S0.98 material reached 0.71 at 773 K,which was about 108.8%higher than that of pure PbS.

关 键 词：硫化铅 热电性能 孔结构 掺杂 

分 类 号：O474[理学—半导体物理]