High temperature thermoelectric properties of highly c-axis oriented Bi2Sr2Co2Oy thin films fabricated by pulsed laser deposition

• 来源期刊: 中国物理B（英文版）
• 关键词: high temperature thermoelectric properties Bi2Sr2Co2Oy thin films c-axis oriented pulsed laser deposition
• 年，卷（期）: 2012,（8）
• 页码范围: 465-468
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/1674-1056/21/8/087306

摘要

High-temperature thermoelectric transport property measurements have been performed on the highly c-axis oriented Bi2Sr2Co2Oy thin films prepared by pulsed laser deposition on LaAlO3 (001).Both the electric resistivity p and the seebeck coefficient S of the film exhibit an increasing trend with the temperature from 300 K-1000 K and reach up to 4.8 m·Ω· cm and 202 μV/K at 980 K,resulting in a power factor of 0.85 mW/mK which are comparable to those of the single crystalline samples.A small polaron hopping conduction can be responsible for the conduction mechanism of the film at high temperature.The results demonstrate that the Bi2Sr2Co2Oy thin film has potential application in high temperature thin film thermoelectric devices.