SeongMin Kim

Yonsei University

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Co-Authors

O. Schneider

École Polytechnique Fédérale de Lausanne

L. E. Piilonen

Virginia Tech

M. Hazumi

High Energy Accelerator Research Organization

T. Lesiak

Institute of Nuclear Physics, Polish Academy of Sciences

S. Nishida

The Graduate University for Advanced Studies, SOKENDAI

Sang‐Woo Kim

Yonsei University

W. Mitaroff

Institute of High Energy Physics

J. Dalseno

Universidade de Santiago de Compostela

M. Tanaka

High Energy Accelerator Research Organization

H. R. Khan

Khulna University

Cooperative Institutions

Laboratoire d’Annecy de Physique des Particules

578

Campbell Collaboration

409

Centre National de la Recherche Scientifique

367

European Organization for Nuclear Research

337

High Energy Accelerator Research Organization

326

Budker Institute of Nuclear Physics

303

Stanford University

292

SLAC National Accelerator Laboratory

280

Institut National de Physique Nucléaire et de Physique des Particules

256

University of the Basque Country

239

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Electron small polarons and their transport in bismuth vanadate: a first principles study

Physical Chemistry Chemical Physics (2014)

Kyoung E. Kweon Gyeong S. Hwang Jin-Han Kim Sungjin Kim SeongMin Kim

Relatively low electron mobility has been thought to be a key factor that limits the overall photocatalytic performance of BiVO4, but the behavior of electrons has not been fully elucidated. We examine electron localization and transport in BiVO4 using hybrid density functional theory calculations. An excess electron is found to remain largely localized on one V atom. The predicted hopping barrier for the small polaron is 0.35 eV (with inclusion of 15% Hartree-Fock exchange), and tends to increase almost linearly with lattice constant associated with pressure and/or temperature changes. We also examine the interaction between polarons, and discuss the possible concentration-dependence of electron mobility in BiVO4.

Bismuth vanadate

Bismuth

Vanadate

10.1039/c4cp03666b

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Citations (87)

Theoretical study on the oscillatory triboelectric charge density in a contact-mode triboelectric nanogenerator

The European Physical Journal Plus (2018)

SeongMin Kim

Nanogenerator

Electrostatic induction

Contact electrification

Charge density

10.1140/epjp/i2018-12352-y

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Citations (9)

Analytical Study on Piezoelectric Effects on Exciton Dissociation

Communications in Computational Physics (2016)

SeongMin Kim Jaewook Ha Hyeok Kim Jin-Baek Kim

Abstract We analytically and numerically compute the Onsager dissociation rate (exciton dissociation) on an interface induced by a piezoelectric potential in an inorganicorganic hybrid p-n junction system (ZnO + (poly(p-phenylene vinylene)); PPV). When a positive piezoelectric potential is created at the interface region owing to the deformation of the system, free electrons accumulate at the interface. Hence, screening effects are observed. It is assumed that the electron layer formed at the interface then attracts free holes from the p-type PPV region, which leads to exciton formation, possibly via the Langevin recombination process. The increased exciton density can then contribute to the Onsager dissociation rate, which is maximum around the interface. This paper focuses on the role of piezoelectric effects in promoting exciton formation at the interface and its relation with the exciton dissociation rate.

Dissociation rate

10.4208/cicp.140515.161115a

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Citations (1)

Design Principles to Maximize Non‐Bonding States for Highly Tribopositive Behavior

Advanced Functional Materials (2022)

Jihye Kim Donghyeon Kang Hoo‐Kyung Lee Joon‐Ha Hwang Hyeon Yeong Lee

Abstract The development of highly tribopositive materials is crucial for realizing high‐performance triboelectric nanogenerators. In this study, a novel protocol to maximize the number of non‐bonding electrons with local dipoles for designing highly tribopositive materials is introduced, and nitrogen‐based dimethylol urea, diazolidinyl urea, and imidazolidinyl urea as promising tribopositive materials are suggested. The mechanism by which nitrogen‐based materials provide highly tribopositive properties is investigated using calculations based on density functional theory. Highly electronegative atoms, such as nitrogen and oxygen, attract electrons from neighboring atoms, resulting in the formation of negative local dipoles in the highest occupied molecular orbital band composed of non‐bonding electrons, thereby creating an electron‐donating environment. The proposed design protocol is confirmed by quantitatively investigating the triboelectric properties of nitrogen‐based materials, and analyzing the charge transfer characteristics of dimethylol urea based on dipole interactions.

10.1002/adfm.202209648

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Citations (27)

Morphology effect on the transferred charges in triboelectric nanogenerators: Numerical study using a finite element method

Integrated ferroelectrics (2017)

SeongMin Kim Jaewook Ha Jin-Baek Kim

The structural shape of the interface between a metal and dielectric material in a triboelectric nanogenerator (TENG) is an important factor that can improve the device performance. Many interfacial structures have been developed to improve the TENG performance. However, there have been very few studies on the numerical interpretation of various types of contact interfaces. For various interfacial structures on which uniform triboelectric charge density is distributed, the surface charge density (in-plane, out-of-plane, and total) is systematically analyzed to predict the quantity of the transferred charges on the bottom metal under a short-circuit condition. In this work, a numerical study is conducted using a finite element method. The numerical results confirm that the increase in the quantity of the transferred charges collected on the bottom metal via electrostatic induction is related to the increase in the area of the surface structures (i.e., surface enlargement effect due to the formation of complex interfacial morphology). The estimated magnitude of the transferred charges shows the following decreasing trend for the various structural shapes: rectangle > cylinder > pyramid > cone > flat.

Nanogenerator

Pyramid (geometry)

Charge density

Electrostatic induction

Rectangle

10.1080/10584587.2017.1375820

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Citations (7)

Influences of Dangling Bonds and Van Der Waals Interactions on the Electronic Structure of Tribopositive Nylon Polymers

SeongMin Kim Hyeon Yeong Lee Sang‐Woo Kim

Nylon 6

Dangling bond

10.2139/ssrn.4997873

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Citations (0)

Contact electrification controlled by material deformation-induced electronic structure changes

Materials Today (2023)

Donghyeon Kang Joon‐Ha Hwang Young‐Jun Kim Pin Zhao Hyeon Yeong Lee

Contact electrification

10.1016/j.mattod.2023.12.007

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Citations (6)

Measurements of the Branching Fraction and Polarization inB+→ρ+K*0Decays

Physical Review Letters (2005)

J. Zhang K. Abe I. Adachi H. Aihara K. Arinstein

We present results of a study of the charmless vector-vector decays B^0 -> K^{*0} rho^0 and B^+ ->K^{*0} rho^+. The results are based on a 140 fb^{-1} data sample collected by the Belle detector at the KEKB asymmetric e^+e^- collider. We obtain the branching fraction B(B^+ -> K^{*0} rho^+)=(6.6 +- 2.2(stat.) +- 0.8 (syst.)) x 10^{-6}, and set upper limits on the branching fractions B(B^0 -> K^{*0} rho^0)<2.6 x 10^{-6} and B(B^0 -> f_0(980) K^{*0})<5.2 x 10^{-6}. We also perform a helicity analysis of the rho and K^* vector mesons in the decay B^+ -> K^{*0} rho^+, and obtain the longitudinal polarization fraction R_0(B^+ -> K^{*0} rho^+)=0.50 +- 0.19(stat.)+0.05-0.07}(syst.).

KEKB

Branching fraction

Helicity

Electron–positron annihilation

B meson

10.1103/physrevlett.95.141801

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Citations (41)

Ferroelectric Coupling Effect on the Energy‐Band Structure of Hybrid Heterojunctions with Self‐Organized P(VDF‐TrFE) Nanomatrices

Advanced Materials (2014)

Kyung‐Sik Shin Tae Yun Kim Gyu Cheol Yoon Manoj Kumar Gupta Sung Kyun Kim

Ferroelectric coupling effects on the energy-band structure of hybrid heterojunctions are investigated using hybrid photovoltaic devices with poly(3-hexylthiophene-2,5-diyl) (P3HT)/ZnO and poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)). The self-organized P(VDF-TrFE):P3HT photoactive layer forms a novel architecture consisting of P3HT domains in a P(VDF-TrFE) matrix. The energy-band structure at the interface of the p–n heterojunction is tuned by artificial control of the ferroelectric polarization of the P(VDF-TrFE) material, consequently modulating the photovoltaic performance of the hybrid photovoltaic devices.

Hybrid material

10.1002/adma.201400405

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Citations (34)

Theoretical study on the dielectric effect on triboelectric nanogenerators

Integrated ferroelectrics (2016)

SeongMin Kim Jaewook Ha Jin-Baek Kim

In this paper, we present a theoretical approach to calculate transferred charges in a triboelectric nanogenerator (TENG) by embedding triboelectric materials with different dielectric constants. The influence of the effective dielectric constant and work function (as a function of dielectric constant) of the composite material is discussed numerically. Two cases are considered separately: averaged surface density of states and . As a result, structural parameters, including both separation distance and composite material thickness, are dependent only for the case of . These findings can guide the design rules for TENG structures.

Nanogenerator

Constant (computer programming)

10.1080/10584587.2016.1252662

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Citations (18)