Avoided Crossing Phonons Realizes High‐Performance Single‐Crystalline β‐Zn4Sb3 Thermoelectrics
Abstract This study reveals the mechanisms behind the ultralow lattice thermal conductivity κL in β‐Zn4Sb3 single crystals through inelastic neutron scattering (INS). Analyzing phonon behaviors and the interaction between acoustic phonons and rattling modes, the first experimental evidence of avoide...
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| Format: | Article |
| Language: | English |
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Wiley
2025-02-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202411498 |
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| author | I‐Lun Jen Cheng‐Yen Lin Kuang‐Kuo Wang Chun‐Ming Wu Chi‐Hung Lee Hsin‐Jay Wu |
| author_facet | I‐Lun Jen Cheng‐Yen Lin Kuang‐Kuo Wang Chun‐Ming Wu Chi‐Hung Lee Hsin‐Jay Wu |
| author_sort | I‐Lun Jen |
| collection | DOAJ |
| description | Abstract This study reveals the mechanisms behind the ultralow lattice thermal conductivity κL in β‐Zn4Sb3 single crystals through inelastic neutron scattering (INS). Analyzing phonon behaviors and the interaction between acoustic phonons and rattling modes, the first experimental evidence of avoided crossing in β‐Zn4Sb3 is provided. The rattler‐phonon avoided crossings contribute to the low κL in a β‐Zn4Sb3 single crystal, enhancing the thermoelectric figure‐of‐merit (zT). TEM characterizations of the β‐Zn4Sb3 single crystal with intrinsic and ultralow κL reveal a grain‐boundary‐free structure with uniformly dispersed rotation moiré fringes that contribute to low lattice thermal conductivity while maintaining a uniform elemental distribution. Additionally, the significant impact of crystallinity control coupled with dilute doping on boosting thermoelectric performance, with single‐crystalline single leg outperforming their polycrystalline counterparts is demonstrated. Notably, the conversion efficiency η of the undoped β‐Zn4Sb3 single leg achieves 1.4% under a temperature gradient of 200 K. |
| format | Article |
| id | doaj-art-fe55cebc00ca4bd9b559fa53843e953f |
| institution | Kabale University |
| issn | 2198-3844 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advanced Science |
| spelling | doaj-art-fe55cebc00ca4bd9b559fa53843e953f2025-02-04T13:14:54ZengWileyAdvanced Science2198-38442025-02-01125n/an/a10.1002/advs.202411498Avoided Crossing Phonons Realizes High‐Performance Single‐Crystalline β‐Zn4Sb3 ThermoelectricsI‐Lun Jen0Cheng‐Yen Lin1Kuang‐Kuo Wang2Chun‐Ming Wu3Chi‐Hung Lee4Hsin‐Jay Wu5Department of Materials Science and Engineering National Taiwan University Taipei 10617 TaiwanDepartment of Applied Physics Tunghai University Taichung 407224 TaiwanDepartment of Materials and Optoelectronic Science National Sun Yat‐sen University Kaohsiung 80424 TaiwanNational Synchrotron Radiation Research Center Hsinchu 300092 TaiwanDepartment of Applied Physics Tunghai University Taichung 407224 TaiwanDepartment of Materials Science and Engineering National Taiwan University Taipei 10617 TaiwanAbstract This study reveals the mechanisms behind the ultralow lattice thermal conductivity κL in β‐Zn4Sb3 single crystals through inelastic neutron scattering (INS). Analyzing phonon behaviors and the interaction between acoustic phonons and rattling modes, the first experimental evidence of avoided crossing in β‐Zn4Sb3 is provided. The rattler‐phonon avoided crossings contribute to the low κL in a β‐Zn4Sb3 single crystal, enhancing the thermoelectric figure‐of‐merit (zT). TEM characterizations of the β‐Zn4Sb3 single crystal with intrinsic and ultralow κL reveal a grain‐boundary‐free structure with uniformly dispersed rotation moiré fringes that contribute to low lattice thermal conductivity while maintaining a uniform elemental distribution. Additionally, the significant impact of crystallinity control coupled with dilute doping on boosting thermoelectric performance, with single‐crystalline single leg outperforming their polycrystalline counterparts is demonstrated. Notably, the conversion efficiency η of the undoped β‐Zn4Sb3 single leg achieves 1.4% under a temperature gradient of 200 K.https://doi.org/10.1002/advs.202411498avoid crossing phononconversion efficiencymoiré fringesthermoelectricsβ‐Zn4Sb3 |
| spellingShingle | I‐Lun Jen Cheng‐Yen Lin Kuang‐Kuo Wang Chun‐Ming Wu Chi‐Hung Lee Hsin‐Jay Wu Avoided Crossing Phonons Realizes High‐Performance Single‐Crystalline β‐Zn4Sb3 Thermoelectrics Advanced Science avoid crossing phonon conversion efficiency moiré fringes thermoelectrics β‐Zn4Sb3 |
| title | Avoided Crossing Phonons Realizes High‐Performance Single‐Crystalline β‐Zn4Sb3 Thermoelectrics |
| title_full | Avoided Crossing Phonons Realizes High‐Performance Single‐Crystalline β‐Zn4Sb3 Thermoelectrics |
| title_fullStr | Avoided Crossing Phonons Realizes High‐Performance Single‐Crystalline β‐Zn4Sb3 Thermoelectrics |
| title_full_unstemmed | Avoided Crossing Phonons Realizes High‐Performance Single‐Crystalline β‐Zn4Sb3 Thermoelectrics |
| title_short | Avoided Crossing Phonons Realizes High‐Performance Single‐Crystalline β‐Zn4Sb3 Thermoelectrics |
| title_sort | avoided crossing phonons realizes high performance single crystalline β zn4sb3 thermoelectrics |
| topic | avoid crossing phonon conversion efficiency moiré fringes thermoelectrics β‐Zn4Sb3 |
| url | https://doi.org/10.1002/advs.202411498 |
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