Effect of crystallinity and thickness on thermal transport in layered PtSe2
Abstract We present a comparative investigation of the influence of crystallinity and film thickness on the acoustic and thermal properties of layered PtSe2 films of varying thickness (1–40 layers) using frequency-domain thermo-reflectance, low-frequency Raman, and pump-probe coherent phonon spectro...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2022-05-01
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| Series: | npj 2D Materials and Applications |
| Online Access: | https://doi.org/10.1038/s41699-022-00311-x |
| _version_ | 1818207541476196352 |
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| author | Alexandros El Sachat Peng Xiao Davide Donadio Frédéric Bonell Marianna Sledzinska Alain Marty Céline Vergnaud Hervé Boukari Matthieu Jamet Guillermo Arregui Zekun Chen Francesc Alzina Clivia M. Sotomayor Torres Emigdio Chavez-Angel |
| author_facet | Alexandros El Sachat Peng Xiao Davide Donadio Frédéric Bonell Marianna Sledzinska Alain Marty Céline Vergnaud Hervé Boukari Matthieu Jamet Guillermo Arregui Zekun Chen Francesc Alzina Clivia M. Sotomayor Torres Emigdio Chavez-Angel |
| author_sort | Alexandros El Sachat |
| collection | DOAJ |
| description | Abstract We present a comparative investigation of the influence of crystallinity and film thickness on the acoustic and thermal properties of layered PtSe2 films of varying thickness (1–40 layers) using frequency-domain thermo-reflectance, low-frequency Raman, and pump-probe coherent phonon spectroscopy. We find ballistic cross-plane heat transport up to ~30 layers PtSe2 and a 35% reduction in the cross-plane thermal conductivity of polycrystalline films with thickness larger than 20 layers compared to the crystalline films of the same thickness. First-principles calculations further reveal a high degree of thermal conductivity anisotropy and a remarkable large contribution of the optical phonons to the thermal conductivity in bulk (~20%) and thin PtSe2 films (~30%). Moreover, we show strong interlayer interactions in PtSe2, short acoustic phonon lifetimes in the range of picoseconds, an out-of-plane elastic constant of 31.8 GPa, and a layer-dependent group velocity ranging from 1340 ms−1 in bilayer to 1873 ms−1 in eight layers of PtSe2. The potential of tuning the lattice thermal conductivity of layered materials with the level of crystallinity and the real-time observation of coherent phonon dynamics open a new playground for research in 2D thermoelectric devices and provides guidelines for thermal management in 2D electronics. |
| first_indexed | 2024-12-12T04:30:34Z |
| format | Article |
| id | doaj.art-8c7ad8384a72438aaa2a74a89833eee5 |
| institution | Directory Open Access Journal |
| issn | 2397-7132 |
| language | English |
| last_indexed | 2024-12-12T04:30:34Z |
| publishDate | 2022-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj 2D Materials and Applications |
| spelling | doaj.art-8c7ad8384a72438aaa2a74a89833eee52022-12-22T00:38:06ZengNature Portfolionpj 2D Materials and Applications2397-71322022-05-01611910.1038/s41699-022-00311-xEffect of crystallinity and thickness on thermal transport in layered PtSe2Alexandros El Sachat0Peng Xiao1Davide Donadio2Frédéric Bonell3Marianna Sledzinska4Alain Marty5Céline Vergnaud6Hervé Boukari7Matthieu Jamet8Guillermo Arregui9Zekun Chen10Francesc Alzina11Clivia M. Sotomayor Torres12Emigdio Chavez-Angel13Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UABCatalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UABDepartment of Chemistry, University of CaliforniaUniversité Grenoble Alpes, CNRS, CEA, Grenoble INP, IRIG-SpintecCatalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UABUniversité Grenoble Alpes, CNRS, CEA, Grenoble INP, IRIG-SpintecUniversité Grenoble Alpes, CNRS, CEA, Grenoble INP, IRIG-SpintecUniversité Grenoble Alpes, CNRS, CEA, Grenoble INP, IRIG-SpintecUniversité Grenoble Alpes, CNRS, CEA, Grenoble INP, IRIG-SpintecCatalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UABDepartment of Chemistry, University of CaliforniaCatalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UABCatalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UABCatalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UABAbstract We present a comparative investigation of the influence of crystallinity and film thickness on the acoustic and thermal properties of layered PtSe2 films of varying thickness (1–40 layers) using frequency-domain thermo-reflectance, low-frequency Raman, and pump-probe coherent phonon spectroscopy. We find ballistic cross-plane heat transport up to ~30 layers PtSe2 and a 35% reduction in the cross-plane thermal conductivity of polycrystalline films with thickness larger than 20 layers compared to the crystalline films of the same thickness. First-principles calculations further reveal a high degree of thermal conductivity anisotropy and a remarkable large contribution of the optical phonons to the thermal conductivity in bulk (~20%) and thin PtSe2 films (~30%). Moreover, we show strong interlayer interactions in PtSe2, short acoustic phonon lifetimes in the range of picoseconds, an out-of-plane elastic constant of 31.8 GPa, and a layer-dependent group velocity ranging from 1340 ms−1 in bilayer to 1873 ms−1 in eight layers of PtSe2. The potential of tuning the lattice thermal conductivity of layered materials with the level of crystallinity and the real-time observation of coherent phonon dynamics open a new playground for research in 2D thermoelectric devices and provides guidelines for thermal management in 2D electronics.https://doi.org/10.1038/s41699-022-00311-x |
| spellingShingle | Alexandros El Sachat Peng Xiao Davide Donadio Frédéric Bonell Marianna Sledzinska Alain Marty Céline Vergnaud Hervé Boukari Matthieu Jamet Guillermo Arregui Zekun Chen Francesc Alzina Clivia M. Sotomayor Torres Emigdio Chavez-Angel Effect of crystallinity and thickness on thermal transport in layered PtSe2 npj 2D Materials and Applications |
| title | Effect of crystallinity and thickness on thermal transport in layered PtSe2 |
| title_full | Effect of crystallinity and thickness on thermal transport in layered PtSe2 |
| title_fullStr | Effect of crystallinity and thickness on thermal transport in layered PtSe2 |
| title_full_unstemmed | Effect of crystallinity and thickness on thermal transport in layered PtSe2 |
| title_short | Effect of crystallinity and thickness on thermal transport in layered PtSe2 |
| title_sort | effect of crystallinity and thickness on thermal transport in layered ptse2 |
| url | https://doi.org/10.1038/s41699-022-00311-x |
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