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The enhanced electrical transport properties of Fe3+ doped Cu2SnS3
Lei Cao,Xueli Du,Xiaohui Guo,Zhihao Yuan 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.6
Cu 2 SnS 3 has attracted much attention as a promising environmental-friendly thermoelectric material. In this work, theFe 3+ doped Cu 2 Sn 1- x Fe x S 3 ( x = 0–0.2) compounds were prepared by a facile route of solvothermal synthesis and microwavesintering. Due to the shallow impurity energy level and additional energy states introduced by the d-unfi lled electrons inthe valence band, Fe 3+ doping eff ectively enhanced the electrical transport properties of Cu 2 SnS 3 , and the ultra-high powerfactor of 1.11 mWK −2 m −1 at 700 K is obtained from Cu 2 Sn 0.85 Fe 0.15 S 3 . Although the smaller grain size and the residualpores of the samples prepared by hydrothermal synthesis and microwave sintering effi ciently inhibited the increase of thelattice thermal conductivity, the improvement of electrical transport leads to the increase of electronic thermal conductivityand total thermal conductivity. Therefore, the fi nal result is not satisfactory, and the maximum ZT value is only 0.63, whichis obtained from Cu 2 Sn 0.85 Fe 0.15 S 3 at 700 K.