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The ultralow thermal conductivity and tunable thermoelectric properties of surfactant-free SnSe nanocrystals

Most studies to date on SnSe thermal transport are focused on single crystals and polycrystalline pellets that are obtained using high-temperature processing conditions and sophisticated instruments. The effects of using sub-10 nm-size SnSe nanocrystals on the thermal transport and thermoelectric pr...

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Autores principales: Mir, Wasim J., Sharma, Anirudh, Villalva, Diego Rosas, Liu, Jiakai, Haque, Md Azimul, Shikin, Semen, Baran, Derya
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9038065/
https://www.ncbi.nlm.nih.gov/pubmed/35480771
http://dx.doi.org/10.1039/d1ra05182b
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author Mir, Wasim J.
Sharma, Anirudh
Villalva, Diego Rosas
Liu, Jiakai
Haque, Md Azimul
Shikin, Semen
Baran, Derya
author_facet Mir, Wasim J.
Sharma, Anirudh
Villalva, Diego Rosas
Liu, Jiakai
Haque, Md Azimul
Shikin, Semen
Baran, Derya
author_sort Mir, Wasim J.
collection PubMed
description Most studies to date on SnSe thermal transport are focused on single crystals and polycrystalline pellets that are obtained using high-temperature processing conditions and sophisticated instruments. The effects of using sub-10 nm-size SnSe nanocrystals on the thermal transport and thermoelectric properties have not been studied to the best of our knowledge. Here, we report the synthesis of sub-10 nm colloidal surfactant-free SnSe NCs at a relatively low temperature (80 °C) and investigate their thermoelectric properties. Pristine SnSe NCs exhibit p-type transport but have a modest power factor of 12.5 μW m(−1) K(−2) and ultralow thermal conductivity of 0.1 W m(−1) K(−1) at 473 K. Interestingly, the one-step post-synthesis treatment of NC film with methylammonium iodide can switch the p-type transport of the pristine film to n-type. The power factor improved significantly to 20.3 μW m(−1) K(−2), and the n-type NCs show record ultralow thermal conductivity of 0.14 W m(−1) K(−1) at 473 K. These surfactant-free SnSe NCs were then used to fabricate flexible devices that show superior performance to rigid devices. After 20 bending cycles, the flexible device shows a 34% loss in the power factor at room temperature (295 K). Overall, this work demonstrates p- and n-type transport in SnSe NCs via the use of simple one-step post-synthesis treatment, while retaining ultralow thermal conductivity.
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spelling pubmed-90380652022-04-26 The ultralow thermal conductivity and tunable thermoelectric properties of surfactant-free SnSe nanocrystals Mir, Wasim J. Sharma, Anirudh Villalva, Diego Rosas Liu, Jiakai Haque, Md Azimul Shikin, Semen Baran, Derya RSC Adv Chemistry Most studies to date on SnSe thermal transport are focused on single crystals and polycrystalline pellets that are obtained using high-temperature processing conditions and sophisticated instruments. The effects of using sub-10 nm-size SnSe nanocrystals on the thermal transport and thermoelectric properties have not been studied to the best of our knowledge. Here, we report the synthesis of sub-10 nm colloidal surfactant-free SnSe NCs at a relatively low temperature (80 °C) and investigate their thermoelectric properties. Pristine SnSe NCs exhibit p-type transport but have a modest power factor of 12.5 μW m(−1) K(−2) and ultralow thermal conductivity of 0.1 W m(−1) K(−1) at 473 K. Interestingly, the one-step post-synthesis treatment of NC film with methylammonium iodide can switch the p-type transport of the pristine film to n-type. The power factor improved significantly to 20.3 μW m(−1) K(−2), and the n-type NCs show record ultralow thermal conductivity of 0.14 W m(−1) K(−1) at 473 K. These surfactant-free SnSe NCs were then used to fabricate flexible devices that show superior performance to rigid devices. After 20 bending cycles, the flexible device shows a 34% loss in the power factor at room temperature (295 K). Overall, this work demonstrates p- and n-type transport in SnSe NCs via the use of simple one-step post-synthesis treatment, while retaining ultralow thermal conductivity. The Royal Society of Chemistry 2021-08-19 /pmc/articles/PMC9038065/ /pubmed/35480771 http://dx.doi.org/10.1039/d1ra05182b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Mir, Wasim J.
Sharma, Anirudh
Villalva, Diego Rosas
Liu, Jiakai
Haque, Md Azimul
Shikin, Semen
Baran, Derya
The ultralow thermal conductivity and tunable thermoelectric properties of surfactant-free SnSe nanocrystals
title The ultralow thermal conductivity and tunable thermoelectric properties of surfactant-free SnSe nanocrystals
title_full The ultralow thermal conductivity and tunable thermoelectric properties of surfactant-free SnSe nanocrystals
title_fullStr The ultralow thermal conductivity and tunable thermoelectric properties of surfactant-free SnSe nanocrystals
title_full_unstemmed The ultralow thermal conductivity and tunable thermoelectric properties of surfactant-free SnSe nanocrystals
title_short The ultralow thermal conductivity and tunable thermoelectric properties of surfactant-free SnSe nanocrystals
title_sort ultralow thermal conductivity and tunable thermoelectric properties of surfactant-free snse nanocrystals
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9038065/
https://www.ncbi.nlm.nih.gov/pubmed/35480771
http://dx.doi.org/10.1039/d1ra05182b
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