Sb和Se掺杂量对Bi_(2)Te_(3)材料热电性能的影响研究  

Influence of Sb and Se Doping Amount on Thermoelectric Properties of Bi_(2)Te_(3) Materials

作　　者：彭星 孙彩云 唐晶晶 丛大龙[1] 吴永鹏 周富 高诗情 PENG Xing;SUN Caiyun;TANG Jingjing;CONG Dalong;WU Yongpeng;ZHOU Fu;GAO Shiqing(Southwest Technology and Engineering Research Institute,Chongqing 400039,China)

机构地区：[1]西南技术工程研究所,重庆400039

出　　处：《电工材料》2024年第4期29-33,36,共6页Electrical Engineering Materials

摘　　要：为了明确Sb、Se掺杂量对Bi_(2)Te_(3)材料热电性能的影响规律,采用高温熔炼法制备不同Sb掺杂量的P型Bi_(2)Te_(3)和不同Se掺杂量的N型Bi_(2)Te_(3)材料,通过SEM和EDS分析、热电性能测试等,研究Sb、Se掺杂量对Bi_(2)Te_(3)材料电导率、塞贝克系数、热导率、热电优值等热电性能的影响。结果表明,随着Sb掺杂量的增大,P型Bi_(2)Te_(3)的电导率先增大后减小,赛贝克系数先减小后增大,热导率减小,热电优值先增大后减小;随着Se掺杂量的增大,N型Bi_(2)Te_(3)的电导率先增大后减小,赛贝克系数先减小后增大,热导率减小,热电优值增大。当Sb掺杂量为22.5%时,P型Bi_(2)Te_(3)在175℃下的热电性能更好,热电优值为0.83;当Se掺杂量为5%时,N型Bi_(2)Te_(3)在175℃下的热电性能更好,热电优值为1.33。To clarify the effect of Sb and Se doping amount on the thermoelectric properties of Bi_(2)Te_(3) materials,P-type Bi_(2)Te_(3) materials with different Sb doping contents and N-type Bi_(2)Te_(3) materials with different Se doping contents were prepared by melting method.Through SEM and EDS analysis,thermoelectric performance test,etc.,the effects of Sb and Se doping on the thermoelectric properties of Bi_(2)Te_(3) materials such as electric conductivity,Seebeck coefficient,thermal conductivity,and thermoelectric figure were studied.With the increase of Sb doping content,the conductance of P-type Bi_(2)Te_(3) first increased and then decreased,the Seebeck coefficient first decreased and then increased,the thermal conductivity decreased,and the thermoelectric figure of merit first increased and then decreased.With the increase of Se doping content,the conductance of N-type Bi_(2)Te_(3) increases first and then decreases,the Seebeck coefficient decreases first and then increases,the thermal conductivity decreases,and the thermoelectricity figure of merit increases.When the Sb doping content is 22.5%,the thermoelectric figure of merit of P-type Bi_(2)Te_(3) at 175℃ is the largest,which is 0.83.When the Se doping content is 5%,the thermoelectric figure of merit of N-type Bi_(2)Te_(3) at 175℃is the largest,which is 1.33.

关 键 词：Bi_(2)Te_(3) 掺杂 电导率 赛贝克系数 热导率 热电优值 

分 类 号：TN377[电子电信—物理电子学]