摘要
因为晶体结构以及热电性能各向异性,硒化锡(SnSe)沿b轴方向表现出优异的热电性能,受到业内的广泛关注。但关于SnSe薄膜研究的报道较少。本研究利用磁控溅射技术,将SnSe沉积到Si/SiO_(2)基底得到SnSe薄膜,分析了沉积温度对SnSe薄膜结构和热电性能的影响。结果显示:沉积温度升高,晶粒尺寸相应增加,薄膜的结晶质量也随之提高。在573 K的沉积温度条件下,能获得高结晶质量和良好化学计量比的(111)取向SnSe薄膜,该薄膜具有约为1.25μW/(cm·K^(2))的最大功率因子(PF)。当沉积温度升高至773 K时,可以得到具有超高迁移率和赛贝克系数的(400)织构SnSe薄膜,该薄膜在573 K的测试温度下,其最大PF为0.5μW/(cm·K^(2)),实现接近于文献报道的相同温度下单晶SnSe沿a轴的PF。本研究的结果证明了高沉积温度对SnSe薄膜微观结构和热电性能调控的重要性,并且为通过设计和调控SnSe基薄膜有序结构来提升其热电性能提供了新的研究思路。
Because of the anisotropy of the crystal structure and thermoelectric(TE)properties,tin selenide(SnSe)exhibits excellent thermoelectric properties along the b-axis and has received great attentions from the communities of science the industry.However,there are few reports on the SnSe thin films.In this study,magnetron sputtering technique is used to deposit SnSe films on a Si/SiO_(2) substrate.The effect of deposition temperature on the structure and TE properties of the SnSe film is analyzed.The results show that with the temperature increases,both the grain size,and the crystal quality of the film increases.The(111)-textured SnSe film with high crystalline quality and good stoichiometric ratio is obtained under the deposition temperature of 573 K,which can obtain the maximum power factor(PF)of about 1.25μW/(cm·K^(2)).In addition,when the temperature increases to 773 K,a(400)-textured SnSe film is obtained,which exhibits an ultra-high carrier mobility and Seebeck coefficient.The maximum PF is as high as 0.5μW/(cm·K^(2)),at 573 K,which is close to value of single crystal SnSe along the a-axis at the similar temperature.Our results prove the importance of appropriate deposition temperature on the microstructure and TE properties of SnSe films and provide a new way for improving the TE properties of SnSe-based films by controlling the ordered microstructures.
作者
崔岩
乔吉祥
赵洋
邰凯平
万晔
CUI Yan;QIAO Jixiang;ZHAO Yang;TAI Kaiping;WAN Ye(School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China;Shenyang National Laboratory for Materials Science, Institute of Metal Research,Chinese Academy of Sciences, Shenyang 110016, China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2021年第4期4012-4017,共6页
Journal of Functional Materials
基金
科技部重点研发计划资助项目(2017YFA0700702,2017YFA0700705,2019QY(Y)0501)
国家自然科学基金资助项目(52073290,51927803,51571193)
辽宁省优秀青年基金资助项目(2019-YQ-08)
沈阳市中青年科技创新人才支持计划资助项目(RC200290)
国防科技基础加强计划技术领域基金资助项目(2020-JCJQ-JJ-482)
2020年度重庆市出版专项资金资助项目。
关键词
SnSe薄膜
磁控溅射
热电性能
织构
功率因子
SnSe film
magnetron sputtering
thermoelectric performance
texture
power factor
