Výsledky vyhledávání - "Yun-Hyok Kye"

Twofold rattling mode-induced ultralow thermal conductivity in vacancy-ordered double perovskite Cs2SnI6

Autor: Un-Gi Jong, Yun-Sim Kim, Chol-Hyok Ri, Yun-Hyok Kye, Chol-Jin Pak, Stefaan Cottenier, Chol-Jun Yu

Publikováno v: Chemical Communications. 58:4223-4226

Using self-consistent phonon calculations, we reveal that strong anharmonicity and twofold rattling modes of Cs2SnI6 induce an ultralow thermal conductivity of 0.11 W m−1 K−1 at 300 K, rarely expected of simple and single-crystalline solids.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a736e0956a595b7d93b2e68f8247b197
https://doi.org/10.1039/d2cc00258b

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High thermoelectric performance in metal phosphides MP2 (M = Co, Rh and Ir): a theoretical prediction from first-principles calculations

Autor: Chung-Jin Kang, Un-Gi Jong, Yun-Hyok Kye, Chol-Jun Yu

Publikováno v: RSC Advances. 12:23829-23838

We investigated the thermoelectric performance of metal phosphides MP2 (M = Co, Rh and Ir), such as Seebeck coefficient, electrical conductivity, and lattice and electron thermal conductivity, using the density functional theory calculations.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8ed2e52708c63f115aa14cd333aac5b2
https://doi.org/10.1039/d2ra04175h

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Improving the stability of hybrid perovskite FAPbI3 by forming 3D/2D interfaces with organic spacers

Autor: Yun-Sim Kim, Chol-Hyok Ri, Yun-Hyok Kye, Un-Gi Jong, Chol-Jun Yu

Publikováno v: Chemical Communications. 58:8440-8443

Organic spacer cations with aromatic rings are more favourable for enhancing the moisture stability of FAPbI3 3D/2D interfaces than those with aliphatic chains. The anilinium-based system shows the highest resistance to water penetration.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d2d12f016ac07f69d686aa7b8a70c15c
https://doi.org/10.1039/d2cc02396b

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Influence of Metal-Ion Replacement on the Phase Stabilization of Cubic All-Inorganic Cesium Lead Halide Perovskites: an Ab Initio Thermodynamic Formalism for Solution-Processed Cation Doping

Autor: Chol-Jun Yu, Yun-Hyok Kye, Un-Gi Jong, Chol-Hyok Kim, Yun-Sim Kim

Publikováno v: The Journal of Physical Chemistry C. 125:13195-13211

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f6cb22bbe0853706774d4f77f8675ae4
https://doi.org/10.1021/acs.jpcc.1c03182

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Interfacial Enhancement of Photovoltaic Performance in MAPbI3/CsPbI3 Superlattice

Autor: Un-Gi Jong, Yun-Hyok Kye, Chol-Jun Yu, Un-Hyok Ko, Yun-Sim Kim, Chol-Hyok Ri

Publikováno v: ACS Applied Materials & Interfaces. 13:14679-14687

Perovskite solar cells have continued to fascinate over the past decade due to fast increasing power conversion efficiency and very low fabrication cost but still suffered from poor stability. Interface engineering is evolved to be one of the most pr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::101cb5b3b3139246ae0f685106240c0c
https://doi.org/10.1021/acsami.0c22550

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High Thermoelectric Performance in the Cubic Inorganic Cesium Iodide Perovskites CsBI3 (B = Pb, Sn, and Ge) from First-Principles

Autor: Yun-Sim Kim, Chol-Jun Yu, Yun-Hyok Kye, Un-Gi Jong, Chol-Hyok Ri

Publikováno v: The Journal of Physical Chemistry C. 125:6013-6019

Searching thermoelectric materials with high performance and low cost is now receiving special attention and great challenges in the field of material design. In this work, we perform first-princip...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2ec29e0ffcb7186cd6164d50351b8a1c
https://doi.org/10.1021/acs.jpcc.0c09929

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First-principles study on structural, electronic and optical properties of perovskite solid solutions KB1−xMgxI3 (B = Ge, Sn) toward water splitting photocatalysis

Autor: Chol-Hyok Ri, Yun-Sim Kim, Se-Hun Ryang, Un-Gi Jong, Yun-Hyok Kye, Chol-Jun Yu

Publikováno v: RSC Advances. 11:26432-26443

We propose lead-free potassium iodide perovskite solid solutions KBI3 with B-site mixing between Ge/Sn and Mg as potential candidates for photocatalysts based on systematic first-principles calculations.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::96c855679bab3a78ff530b9c19c16489
https://doi.org/10.1039/d1ra04534b

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Effect of vacancy concentration on the lattice thermal conductivity of CH3NH3PbI3: a molecular dynamics study

Autor: Chol-Jun Yu, Song-Hyok Choe, Song-Nam Hong, Yun-Hyok Kye, Un-Gi Jong

Publikováno v: RSC Advances. 11:34015-34023

Hybrid halide perovskites are drawing great interest for photovoltaic and thermoelectric applications, but the relationship of thermal conductivities with vacancy defects remains unresolved. Here, we present a systematic investigation of the thermal

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ac3106cd51fcdb6226f8b7689eaf3fe7
https://doi.org/10.1039/d1ra05393k

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