热处理对Bi_(2)Te_(2.7)Se_(0.3)热电薄膜形貌及性能的影响  

The effect of thermal treatment on the morphology and performance of Bi_(2)Te_(2.7)Se_(0.3)thermoelectric thin films

作　　者：李燕怡[1,2] 李晓龙 邸友莹 陈凤英[1] 贾欣欣[1] LI Yanyi;LI Xiaolong;DI Youying;CHEN Fengying;JIA Xinxin(Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources,Shangluo University,Shangluo 726000,China;Shaanxi Engineering Research Center for Mineral Resources Clean&Efficient Conversion and New Materials,Shangluo 726000,China)

机构地区：[1]商洛学院陕西省尾矿资源综合利用重点实验室,陕西商洛726000 [2]陕西省矿产资源清洁高效转化与新材料工程研究中心,陕西商洛726000

出　　处：《甘肃科学学报》2024年第5期104-109,共6页Journal of Gansu Sciences

基　　金：陕西省教育厅重点科研计划项目(21JS024)。

摘　　要：为研究热处理对三元Bi_(2)Te_(2.7)Se_(0.3)热电薄膜形貌和性能的影响,采用恒电位沉积的方法制备了两个热电薄膜,通过X射线衍射、场发射扫描电镜(FE-SEM)对其物相、形貌进行表征;通过台阶仪和霍尔效应测试系统对薄膜的膜厚和性能进行测试。研究结果表明,采用电化学沉积法制备的三元膜为纯相Bi_(2)Te_(2.7)Se_(0.3),在(110)晶面有择优取向;扫描电镜观察结果表明,热处理显著改变了薄膜的微观形貌,使得三元薄膜从“白菜叶”形貌变为由纳米片相互交叉组成的微球;霍尔效应测试结果表明,热处理后薄膜的电导率得到了提高,载流子浓度则轻微降低。In order to study on the effect of the thermal treatment on morphology and properties of Bi_(2)Te_(2.7)Se_(0.3)thermoelectric films,two thermoelectric films were potentiostatically deposited.The phase and morphology were characterized by XRD and FE-SEM.Meanwhile,the thickness of films and property were determined by a surface profiler and a Hall effect measurement system.The XRD results showed that the as-prepared films were single-phase Bi_(2)Te_(2.7)Se_(0.3)compound thin films with remarkable(110)preferred orientation.Moreover,the SEM results indicated that thermal treatment obviously changed the morphology of the films from cabbage leaves-like morphology to little sphere-like morphology composed of nanosheets which inserted each other.In addition,the results of Hall effect measurement showed that the electrical conductivity of the as-deposited film was elevated,whereas the carrier concentrations of electrodeposited films were slightly decreased by thermal treatment.

关 键 词：热处理 热电材料 薄膜 热电性能 形貌 

分 类 号：TB332[一般工业技术—材料科学与工程]