宽带隙n-型半导体CuIn5Se8的热电性能研究

Thermoelectric Properties of n-Type Semiconductor CuIn5Se8 with Wide Band Gap

摘要:

利用放电等离子烧结技术制备了宽带隙三元半导体化合物CuIn5Se8，并对其热电性能进行了研究。物相分析表明，化合物为单相CuIn5Se8，带隙宽度为1.13 eV，比In2Se3合金的低。电学性能测试结果表明，随温度升高Seebeck系数绝对值从370.0 μV·K-1降低到263.0 μV·K-1，而电导率则随温度迅速增大。在818 K时，其电导率达到最大值 2.92′103 W-1·m-1，热导率为0.50 W·K-1·m-1，最高热电优值ZT值达到0.33。

Abstract:

Wide-gap ternary semiconductor CuIn5Se8 was prepared by the spark plasma sintering technique, and its thermoelectric properties were evaluated at 318~818 K. XRD analysis and band gap measurement indicate that this ternary compound is single phase CuIn5Se8 with its band gap of 1.13 eV, about 0.2 eV smaller than that of In2Se3. The magnitude of Seebeck coefficient decreases from 370.0 to 263.0 mV·K-1, and electrical conductivity increases from 1.44′102 to 2.92′103 W-1·m-1 with the temperature increasing. The thermal conductivity is 0.50 W·K-1·m-1, and the maximum thermoelectric figure of merit ZT is 0.33 at 818 K