Carrier-filtering and phonon-blocking AgSnSe 2 -decorated grain boundaries to boost the thermoelectric performance of Cu 2 Sn 0.9 Co 0.1 S 3
Source abstract
Abstract
Heavily co-doped Cu2SnS3 can achieve a high power factor by relying on a high electrical conductivity (σ), which subsequently limits the ZT value with a large electronic thermal conductivity (κe). We report here an enhanced ZT for Cu2Sn0.9Co0.1S3 decorated with micro-nanoscale AgSnSe2 along grain boundaries. The AgSnSe2 phase served as a charge carrier filter by ionized impurity scattering, with a noticeable bottoming out of carrier mobility and a rapid increase in the Seebeck coefficient as the temperature increased from 423 to 573 K, which properly reduced the large σ and κe while maintaining a high power factor of approximately 10 μW cm-1 K-2 at 773 K. Lattice thermal conductivity was markedly suppressed, and a low total thermal conductivity was obtained with strengthened phonon scattering by the AgSnSe2 phase as a phonon barrier. With the synergistic effects on electrical and thermal transport, a maximum ZT of 0.93 at 773 K was achieved in Cu2Sn0.9Co0.1S3-3 wt% AgSnSe2.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal properties of materials · Thermal Radiation and Cooling Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, China
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
Sino-Foundry Refractory (Jiangsu) Co., Ltd, Zhenjiang 212114, China
Funding
National Key Research and Development Program of China · Priority Academic Program Development of Jiangsu Higher Education Institutions · Nanjing Tech University · Natural Science Foundation of Jiangsu Province · National Natural Science Foundation of China
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