Enhanced figure of merit in (AgCrSe2)0.75(CuCrSe2)0.25.

Authors :: Bhattacharya, S.
Bhatt, R.
Basu, R.
Singh, A.
Aswal, D. K.
Gupta, S. K.
Source :: AIP Conference Proceedings; Feb2013, Vol. 1512 Issue 1, p1000-1001, 2p, 4 Graphs
Publication Year :: 2013
Abstract: The effect of CuCrSe<subscript>2</subscript> addition in AgCrSe<subscript>2</subscript> has been studied in the temperature range 300K to 700K. The AgCrSe<subscript>2</subscript> itself is a very good thermoelectric material; a small amount 25% of CuCrSe<subscript>2</subscript> addition significantly improves the thermoelectric properties. The electrical resistivity (ρ) of the material was found to reduce from 296μωm to for AgCrSe<subscript>2</subscript> to 186μωm for (AgCrSe<subscript>2</subscript>)<subscript>0.75</subscript>(CuCrSe<subscript>2</subscript>)<subscript>0.25</subscript>. Although the seebeck coefficient (S) of both the remains unaltered at 700K, the Power Factor (i.e. S2/ρ) increases from 133μW/m-K2 to 220μW/m-K2. The (AgCrSe<subscript>2</subscript>)<subscript>0.75</subscript>(CuCrSe<subscript>2</subscript>)<subscript>0.25</subscript> also has a lower thermal conductivity (κ) than that of AgCrSe<subscript>2</subscript>. Therefore as a result dimensionless figure of merit (zT) was enhanced from 0.8 to 1.4 at 700 K. [ABSTRACT FROM AUTHOR]