KBr掺杂多晶SnSe化合物热电性能的研究

第40卷第4期 2017年11月

浙江师范大学学报（自然科学版）.

Journal of Zhejiang Normal University(Nat.Sci.)

Vol. 40, No. 4

Nov.2017

D O I：10.16218/j. issn. 1001-5051.2017. 04. 006

K B r掺杂多晶S n S e化合物热电性能的研究$

杨实丹，斯剑霄，陈子洁，陈明

(浙江师范大学数理与信息工程学院，浙江金华321004)

摘要:采用感应熔炼结合快速感应热压方法制备了 K,Sn _,SeBr(= 0,0.01,0.02,0.03,0.04，0.05,0.06)

系列样品,研究了 KBi■掺杂对多晶SnSe热电性能的影响.当温度为373 K时,=0.05的样品电导率达到

39.12 S/c m,是纯SnSe的24倍；同时在r = /10 K时获得一个较低的晶格热导率0.26 W/(m ? K),峰值灯

达到了 0. /5,提高了 70%.结果表明：K B r掺杂能有效提高SnSe材料在中低段（300 ~700 K)的热电性能.

关键词：SnSe;KBr;Seebeck系数；热电性能

中图分类号:TB34 文献标识码：A文章编号=1001-5051 (2017)04-0392-6

Studies on thermoelectric performance of polycrystalline SnSe

doped with Patassium Bromide

YANGShidan,SI Jianxiao,C H E N Z ijie,CHEN Ming

(College o f Mathematics, Physics and Information Engineering，Zhejiang Normal University，Jinhua 321004，China)

A b stra ct：The samples of Kx Sn1_x SeBrx(x =0,0.01,0.02,0.03,0.04,0.05 and 0.06) were prepared by induction melting and rapid induction hot pressing.It was investigated the effect on the thermoelectric properties of polycrystalline SnSe doped with KBr.An electrical conductivity of39. 12 S/cm was obtained at 373 K when x=0. 05 ,which was24 times higher than that of the pristine SnSe.Meanwhile the lattice thermal conductivity was reduced to0.26 W/(m ?K)at/10K,and a peak of ZT*0./5 was achieved,which was 70%higher than that of prstine SnSe.It was found that KBr doping could effectively increase the thermoelec-trc performance of SnSe materals in a relatively wide mid and low temperatu Key words：SnSe;K

B r;Seebeck coefficient;thermoelectric performance

0引言

随着社会的发展，能源短缺和环境污染问题日益突出，已对当前人类形成巨大的挑战.热电材料因 其自身具有实现热能与电能之间相互转换的功能而成为当前研究的热点[14].用无量纲的热电优值z r

来表征热电材料的能量转换效率，Z：T= S2(777k其中：，，k T1分别为材料的Seebeck系数、电导率、热

*收文日期：017-04-25 ;修订日期：2017-06-22

基金项目：国家自然科学基金资助项目（5130224/)

作者简介:杨实丹（990 _),男，云南昭通人，硕士研究生.研究方向：热电材料.

通信作者:斯剑霄.E-m ail:sjx@zjnu. cn