In:
Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Vol. 9, No. 41 ( 2021), p. 14858-14865
Abstract:
As a thermoelectric material, p-type CuSbSe 2 has attracted much attention due to its intrinsic low thermal conductivity and environment friendly constituents. In this work, Sb deficient compounds CuSb 1− x Se 2 ( x = 0–0.12) are prepared by vacuum melting with spark plasma sintering (SPS) and their thermoelectric properties are studied. It is found that when CuSb 1− x Se 2 samples are deficient in Sb ( i.e. , x 〉 0), their electrical conductivity increases by more than two times (at 300 K) due to the increase in hole concentration caused by Sb vacancies, . Moreover, experiments show that as the Sb vacancy concentration x increases to 0.09, the density of states effective mass is enhanced by ∼3 times, which leads to the 70% enhancement of thermopower (at 300 K). In addition, around 22% reduction of lattice thermal conductivity is observed due to the intensified phonon scattering by Sb vacancies, phonon–phonon scattering and phase boundaries. As a result, a peak power factor of 3.2 μW cm −1 K −2 and a maximum figure of merit ZT of 0.50 are achieved at 673 K for CuSb 0.91 Se 2 , which are ∼38% and ∼44% larger than those of pristine CuSbSe 2 .
Type of Medium:
Online Resource
ISSN:
2050-7526
,
2050-7534
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
2702245-6
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