Phonon Scattering and Suppression of Bipolar Effect in MgO/VO<sub>2</sub> Nanoparticle Dispersed p-Type Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub> Composites
Bismuth-Telluride-based compounds are unique materials for thermoelectric cooling applications. Because Bi<sub>2</sub>Te<sub>3</sub> is a narrow gap semiconductor, the bipolar diffusion effect is a critical issue to enhance thermoelectric performance. Here, we report the sign...
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| Online Access: | https://www.mdpi.com/1996-1944/14/10/2506 |
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| author | Song Yi Back Jae Hyun Yun Hyunyong Cho Gareoung Kim Jong-Soo Rhyee |
| author_facet | Song Yi Back Jae Hyun Yun Hyunyong Cho Gareoung Kim Jong-Soo Rhyee |
| author_sort | Song Yi Back |
| collection | DOAJ |
| description | Bismuth-Telluride-based compounds are unique materials for thermoelectric cooling applications. Because Bi<sub>2</sub>Te<sub>3</sub> is a narrow gap semiconductor, the bipolar diffusion effect is a critical issue to enhance thermoelectric performance. Here, we report the significant reduction of thermal conductivity by decreasing lattice and bipolar thermal conductivity in extrinsic phase mixing of MgO and VO<sub>2</sub> nanoparticles in Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub> (BST) bulk matrix. When we separate the thermal conductivity by electronic <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>κ</mi><mrow><mi>e</mi><mi>l</mi></mrow></msub></mrow></semantics></math></inline-formula>, lattice <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>κ</mi><mrow><mi>l</mi><mi>a</mi><mi>t</mi></mrow></msub></mrow></semantics></math></inline-formula>, and bipolar <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>κ</mi><mrow><mi>b</mi><mi>i</mi></mrow></msub></mrow></semantics></math></inline-formula> thermal conductivities, all the contributions in thermal conductivities are decreased with increasing the concentration of oxide particle distribution, indicating the effective phonon scattering with an asymmetric scattering of carriers. The reduction of thermal conductivity affects the improvement of the <i>ZT</i> values. Even though significant carrier filtering effect is not observed in the oxide bulk composites due to micro-meter size agglomeration of particles, the interface between oxide and bulk matrix scatters carriers giving rise to the increase of the Seebeck coefficient and electrical resistivity. Therefore, we suggest the extrinsic phase mixing of nanoparticles decreases lattice and bipolar thermal conductivity, resulting in the enhancement of thermoelectric performance over a wide temperature range. |
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| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T11:29:10Z |
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| spelling | doaj.art-d9dcb703ee0d4da8aef114e29492cb172023-11-21T19:24:59ZengMDPI AGMaterials1996-19442021-05-011410250610.3390/ma14102506Phonon Scattering and Suppression of Bipolar Effect in MgO/VO<sub>2</sub> Nanoparticle Dispersed p-Type Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub> CompositesSong Yi Back0Jae Hyun Yun1Hyunyong Cho2Gareoung Kim3Jong-Soo Rhyee4Department of Applied Physics, Integrated Education Institute for Frontier Science and Technology (BK21 Four) and Institute of Natural Sciences, Kyung Hee University, Yongin 17104, KoreaDepartment of Applied Physics, Integrated Education Institute for Frontier Science and Technology (BK21 Four) and Institute of Natural Sciences, Kyung Hee University, Yongin 17104, KoreaDepartment of Applied Physics, Integrated Education Institute for Frontier Science and Technology (BK21 Four) and Institute of Natural Sciences, Kyung Hee University, Yongin 17104, KoreaEnergy Materials Laboratory, Toyota Technological Institute, Nagoya 468-8511, JapanDepartment of Applied Physics, Integrated Education Institute for Frontier Science and Technology (BK21 Four) and Institute of Natural Sciences, Kyung Hee University, Yongin 17104, KoreaBismuth-Telluride-based compounds are unique materials for thermoelectric cooling applications. Because Bi<sub>2</sub>Te<sub>3</sub> is a narrow gap semiconductor, the bipolar diffusion effect is a critical issue to enhance thermoelectric performance. Here, we report the significant reduction of thermal conductivity by decreasing lattice and bipolar thermal conductivity in extrinsic phase mixing of MgO and VO<sub>2</sub> nanoparticles in Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub> (BST) bulk matrix. When we separate the thermal conductivity by electronic <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>κ</mi><mrow><mi>e</mi><mi>l</mi></mrow></msub></mrow></semantics></math></inline-formula>, lattice <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>κ</mi><mrow><mi>l</mi><mi>a</mi><mi>t</mi></mrow></msub></mrow></semantics></math></inline-formula>, and bipolar <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>κ</mi><mrow><mi>b</mi><mi>i</mi></mrow></msub></mrow></semantics></math></inline-formula> thermal conductivities, all the contributions in thermal conductivities are decreased with increasing the concentration of oxide particle distribution, indicating the effective phonon scattering with an asymmetric scattering of carriers. The reduction of thermal conductivity affects the improvement of the <i>ZT</i> values. Even though significant carrier filtering effect is not observed in the oxide bulk composites due to micro-meter size agglomeration of particles, the interface between oxide and bulk matrix scatters carriers giving rise to the increase of the Seebeck coefficient and electrical resistivity. Therefore, we suggest the extrinsic phase mixing of nanoparticles decreases lattice and bipolar thermal conductivity, resulting in the enhancement of thermoelectric performance over a wide temperature range.https://www.mdpi.com/1996-1944/14/10/2506thermoelectricbismuth tellurideoxide nanoparticle compositephonon scattering |
| spellingShingle | Song Yi Back Jae Hyun Yun Hyunyong Cho Gareoung Kim Jong-Soo Rhyee Phonon Scattering and Suppression of Bipolar Effect in MgO/VO<sub>2</sub> Nanoparticle Dispersed p-Type Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub> Composites Materials thermoelectric bismuth telluride oxide nanoparticle composite phonon scattering |
| title | Phonon Scattering and Suppression of Bipolar Effect in MgO/VO<sub>2</sub> Nanoparticle Dispersed p-Type Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub> Composites |
| title_full | Phonon Scattering and Suppression of Bipolar Effect in MgO/VO<sub>2</sub> Nanoparticle Dispersed p-Type Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub> Composites |
| title_fullStr | Phonon Scattering and Suppression of Bipolar Effect in MgO/VO<sub>2</sub> Nanoparticle Dispersed p-Type Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub> Composites |
| title_full_unstemmed | Phonon Scattering and Suppression of Bipolar Effect in MgO/VO<sub>2</sub> Nanoparticle Dispersed p-Type Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub> Composites |
| title_short | Phonon Scattering and Suppression of Bipolar Effect in MgO/VO<sub>2</sub> Nanoparticle Dispersed p-Type Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub> Composites |
| title_sort | phonon scattering and suppression of bipolar effect in mgo vo sub 2 sub nanoparticle dispersed p type bi sub 0 5 sub sb sub 1 5 sub te sub 3 sub composites |
| topic | thermoelectric bismuth telluride oxide nanoparticle composite phonon scattering |
| url | https://www.mdpi.com/1996-1944/14/10/2506 |
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