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Using heterostructural alloying to tune the structure and properties of the thermoelectric Sn1–xCaxSe

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/c7ta03694a· OSTI ID:1379467

We grow and kinetically stabilize the isotropic rocksalt phase of SnSe thin films by alloying SnSe with CaSe. Thin polycrystalline films of the metastable heterostructural alloy Sn1–xCaxSe are synthesized by pulsed laser deposition on amorphous SiO2 over the entire composition range 0 < x < 1. We observe the theoretically-predicted, composition-driven change from a layered, orthorhombic structure to an isotropic, cubic structure near x = 0.18, in reasonable agreement with the theoretical value of x = 0.13 calculated from first principles. The optical band gap is highly non-linear in x and the trend agrees with theory predictions. Compared to the layered end-member SnSe, the isotropic alloy near the orthorhombic-to-rocksalt transition has a p-type electrical resistivity three orders of magnitude lower, and a thermoelectric power factor at least ten times larger. Furthermore manipulation of the structure of a functional material like SnSe via alloying may provide a new path to enhanced functionality, in this case, improved thermoelectric performance.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Next Generation of Materials by Design: Incorporating Metastability (CNGMD)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1379467
Alternate ID(s):
OSTI ID: 1390296
Report Number(s):
NREL/JA--5K00-70057
Journal Information:
Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 32 Vol. 5; ISSN JMCAET; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

High‐Performance Thermoelectric SnSe: Aqueous Synthesis, Innovations, and Challenges journal February 2020
Linking thermoelectric generation in polycrystalline semiconductors to grain boundary effects sets a platform for novel Seebeck effect-based sensors journal January 2018
Negative-pressure polymorphs made by heterostructural alloying journal April 2018
Atomic layer deposition of cubic tin–calcium sulfide alloy films journal November 2019
Wurtzite materials in alloys of rock salt compounds journal January 2020
Reliable Method to Detect Alloy Soldering Fractures under Accelerated Life Test journal August 2019
Enhanced Thermoelectric Properties of Polycrystalline SnSe via LaCl3 Doping journal January 2018

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