Optimization of Thermoelectric Properties of p-type AgSbTe₂ Thin Films via Electrochemical Synthesis

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• 作者：Jiwon Kim^a ; ¹ ; Joo-Youl Lee^b ; Jae-Hong Lim^b ; ^{lim@kims.re.kr" class="auth_mail" title="E-mail the corresponding author} ; Nosang V. Myung^a ; ^{myung@engr.ucr.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Silver antimony telluride ; electrodeposition ; crystallinity ; composition ; thermoelectric property
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 April 2016
• 年：2016
• 卷：196
• 期：Complete
• 页码：579-586
• 全文大小：1681 K

文摘

Silver antimony telluride (AgSbTe₂) thin films were fabricated by a simple and cost-effective electrodeposition method for the first time. To investigate the effects of crystallinity and composition on the films’ thermoelectric (TE) properties, amorphous Ag_xSb_yTe_z solid solutions of various compositions were electrodeposited by tailoring the [Ag⁺] concentration in the electrolytes, followed by a thermally driven solid-state amorphous-to-nanocrystalline phase transition. Because of the lower carrier concentration in the nanocrystalline phases, higher Hall mobility and Seebeck coefficients, almost twice as high as those observed in the bulk materials, resulted in enhanced power factors of 90–553 μW/mK². The maximum power factor was obtained from stoichiometric AgSbTe₂ thin films. The reported power factors are highly comparable to other values reported for electrodeposited p-type V–VI compounds. The improvement achieved in the TE properties of electrodeposited AgSbTe₂ thin films demonstrates the feasibility of the use of these films as p-type legs in room-temperature operations.