학술논문
Synthesis and Thermoelectric Characterization of Sb-Doped Cu2 Se by Mechanical Alloying and Solid-State Reaction
Document Type
Original Paper
Author
Source
Journal of Electronic Materials. 53(2):693-701
Subject
Language
English
ISSN
0361-5235
1543-186X
1543-186X
Abstract
In this study, Sb-doped Cu2 Se1−x Sbx (x = 0, 0.005, 0.01, 0.015, 0.02, and 0.025) compounds were synthesized using mechanical alloying combined with a solid-state reaction technique. The crystal structure of the Sb-doped samples was a mixture phase between α-Cu2−δ Se and β-Cu2−δ Se, and a minor phase of Cu3 Se2 , Cu2 O, and excess Sb in high-doping-level samples. The electrical properties of Sb-doped samples were improved when compared to the undoped sample by the enhancement of carrier concentration via the creation of an acceptor level after Sb doping. The thermal conductivity decreased with increasing x and reached the lowest value in the Cu2 Se0.98 Sb0.02 sample. As a result, the sample with an Sb-doped level of 0.02 showed the highest ZT value of 1.22 at 823 K.