Enhancement of thermoelectric performance for CuCl doped P-type Cu2Sn0.7Co0.3S3

Shi, D.-L. and Lam, K.-H. (2023) Enhancement of thermoelectric performance for CuCl doped P-type Cu2Sn0.7Co0.3S3. Materials, 16(6), 2395. (doi: 10.3390/ma16062395)

Abstract

Cu2SnS3 (CSS) has gained great attraction due to its constitutive earth-abundant elements and intrinsic low lattice thermal conductivity, κl, potentially providing high quality factor, B, and high zT value. However, the lack of band convergence is the bottleneck to enhancing the thermoelectric performance of Cu2SnS3 when performing the band engineering. To study the doping effect on the band structure and the thermoelectric performance, the composite Cu2Sn0.7Co0.3S3-xCuCl (x = 0, 0.1, 0.2, 0.3) (CSCS-xCuCl) has been investigated for the first time. The samples showed excellent data repeatability at high temperatures of up to 700 K. It was found that CuCl could compensate the Cu loss, enhance the phonon scattering and minimize the adverse effect on the power factor, PF. The ultralow lattice thermal conductivity could reach 0.38 W m−1 K−1 for the nominal composition of CSCS-0.3CuCl at 700 K. A peak zT of 0.56 (evaluated with no cold finger effect) was realized at 700 K when x = 0.3, which is almost double the performance of pristine samples.

• Item Type: Articles
• Additional Information: Funding: We thank the support from The Hong Kong Polytechnic University (1-ZVGH, DD7F).
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Lam, Dr Koko

Creator Roles

Lam, K.-H.: Writing – review and editing

• Authors: Shi, D.-L., and Lam, K.-H.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: Materials
• Publisher: MDPI
• ISSN: 1996-1944
• ISSN (Online): 1996-1944
• Copyright Holders: Copyright © 2023 by the authors
• First Published: First published in Materials 16(6):2395
• Publisher Policy: Reproduced under a Creative Commons license