电化学沉积Bi_2Te_3薄膜及其发电器件的制备  

Electrochemical Deposition of Bi_2Te_3 Thin Film and Power Generation Device

作　　者：汪韧[1] 刘玉梅[1] 何少云 

机构地区：[1]邵阳学院机械与能源工程系,湖南邵阳422000 [2]珠海佳一电子技术有限公司,广东珠海519000

出　　处：《材料科学与工程学报》2015年第4期605-608,612,共5页Journal of Materials Science and Engineering

基　　金：湖南省邵阳学院研究生创新项目(CX2014SY017)

摘　　要：通过控制不同梯度的电流密度和电沉积时间,利用电化学方法在铜片上沉积Bi/Te薄膜,经不同温度退火处理后生成Bi2Te3;采用SEM(带EDS)和XRD对薄膜的形貌、成分进行分析,研究了电流密度和电沉积时间对晶粒成长的影响,并对用Bi2Te3薄膜制成发电器件的性能进行了研究。结果表明:电流密度越大,Bi2Te3晶粒尺寸越小;电沉积的时间越长,Bi2Te3薄膜越均匀;退火过程中350℃结晶效果最好;退火后可以形成多晶薄膜,颗粒致密均匀,具有一定择优取向性,还可以提高Seebeck系数,达到-123μV/K;对比传统块状粒子发电,电化学沉积制备的Bi2Te3薄膜发电器件更具有优势。By controlling current density with different gradient and electrodeposition time, Bi/Te films were prepared on Cu substrates by electrochemical deposition, which turned out to be Bi2Te 3films after annealing at different temperatures. What influence the grain growth of the films were studied by analyzing the morphology andcomposition through SEM （with EDS） and XRD tests. Performance of the Bi2 Te3 thin films as a power generation device was also investigated. These results indicate that the greater the current density, the smaller the Bi2Te3 grain size the longer electrodeposition time, the more uniform the Bi2Te3 thin film. Annealing at 350℃ bring about the best crystallization effect, forming a polycrystalline thin film with dense and uniform particle distribution and preferred orientation, and improved the Seebeck coefficient （-123μV/K）. Compared to traditional block materials, it has obvious advantages to apply Bi2Te3 thin films instead as the power generation materials.

关 键 词：Bi2Te3薄膜 电化学沉积 退火 塞贝克系数 

分 类 号：TQ153[化学工程—电化学工业] O649[理学—物理化学]