Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 40, Pages 37216-37228Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b10682
Keywords
two-dimensional materials; thermoelectrics; DFT calculations; carrier mobilities; optical properties
Funding
- National Natural Science Foundation of China [11374063, 11544008]
- Shanghai Municipal Natural Science Foundation [19ZR1402900, 18ZR1402500]
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As a traditional thermoelectric material with high thermoelectric performance at room temperature, antimony telluride (Sb2Te3) has been widely used in energy applications like power generation and refrigeration. By employing the atomic transmutation method, three new kinds of Sb2Te3-based monolayers of alpha-Sb2Te2Se, alpha-Sb2TeSe2, and beta-Sb2TeSe2 are designed, which are expected to possess a high thermoelectric performance due to the quantum-confinement effects. In this work, by using the ab initio calculations, we systematically study electronic structures, vibration modes, optical, transport, and thermoelectric properties for the three kinds of monolayers and find that they are indirect-band-gap semiconductor materials with chemical and thermodynamic stability up to 700 K (alpha-Sb2TeSe2) or 900 K (alpha-Sb2Te2Se and beta-Sb2TeSe2). The band gaps are around 1.0 eV with five nearly degenerate peaks in valence bands. The three Sb2Te3-xSex monolayers possess high electron mobilities larger than 1000 cm(2)/(V s), and the maximum zT values of alpha-Sb2Te2Se/alpha-Sb2TeSe2/beta-Sb2TeSe2 are 0.70/0.71/0.65 at 300 K, respectively. For optical properties, the three Sb2Te3-xSex monolayers possess a wide absorption range from the blue region to the ultraviolet region. Compared with Sb2Te3, the three new kinds of monolayers possess a wider range of absorptions, higher mobilities, and thermoelectric performances, which may lead to promising applications in thermoelectric devices and saturable absorbers.
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