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이창환 교수

Changhwan Lee

KAIST 신소재공학과 · 재료과학

연구실 소개

이창환 교수의 연구실은 플라즈몬 나노구조를 활용한 열전자(핫전자) 에너지 변환 기반의 신소재 및 신기반 광전소자에 중점을 두고 있습니다. 특히 금 나노입자와 산화티타늄 기반 구조에서 발생하는 핫전자를 효율적으로 추출하고 증폭하는 메커니즘을 규명하며, 표면 플라즈몬 공진, 슈트키 장벽 조절, 양자점 도핑 등을 통해 광전류를 최적화하는 데 성과를 내고 있습니다. 또한, 염료 중심의 광학적 특성 제어 및 업컨verting 나노입자에서의 색 중심 현상 연구를 통해 고감도 센서 및 효율적인 에너지 변환 소자 개발에 기여하고 있습니다.

핫전자 변환플라즈몬 나노소재광전소자에너지 변환양자점 도핑

연구 현황

논문 수
113
총 인용 수
1,749
최근 5년 논문
27
주요 분야
재료과학

연구 성과 추이

표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.

5개년 연도별 논문 게재 수
27총합
2022
2023
2024
2025
2026
5개년 연도별 피인용 수
329총합
20222023202420252026

주요 논문

15
1
논문|인용수 114·2011
Calculating Feature Weights in Naive Bayes with Kullback-Leibler Measure
Changhwan Lee, Fernándo López López, Dejing Dou

Naive Bayesian learning has been popular in data mining applications. However, the performance of naive Bayesian learning is sometimes poor due to the unrealistic assumption that all features are equally important and independent given the class value. Therefore, it is widely known that the performance of naive Bayesian learning can be improved by mitigating this assumption, and many enhancements to the basic naive Bayesian learning have been proposed to resolve this problem including feature se

Computer Vision and Pattern RecognitionComputer Science
2
논문|인용수 97·2023
Indefinite and bidirectional near-infrared nanocrystal photoswitching
Changhwan Lee, Emma Xu, Kevin W. C. Kwock, Ayelet Teitelboim, Yawei Liu, Hye Sun Park, Benedikt Ursprung, Mark E. Ziffer, Yuzuka Karube, Natalie Fardian‐Melamed, Cássio Cardoso Santos Pedroso, Jong-Woo Kim
SJR Q1NatureOA
Materials ChemistryMaterials Science
3
논문|인용수 68·2019
Hot electrons generated by intraband and interband transition detected using a plasmonic Cu/TiO2 nanodiode
Changhwan Lee, Yujin Park, Jeong Young Park
SJR Q1RSC AdvancesOA

oxidation of the Cu layer. Our results can provide a better understanding for copper-based hot electron photovoltaics, which could lead to more efficient plasmonic energy conversion.

Electronic, Optical and Magnetic MaterialsMaterials Science
4
논문|인용수 22·2018
Polarization Effect of Hot Electrons in Tandem-Structured Plasmonic Nanodiode
Changhwan Lee, Young Keun Lee, Yujin Park, Jeong Young Park
SJR Q1ACS Photonics

Energy conversion from light to electricity mediated by hot electrons in a plasmonic metal nanostructure caused by the decay of surface plasmons has been proposed as a promising way to obtain novel photovoltaics and photocatalytic devices. In Schottky barriers composed of metal nanostructures supported on a semiconductor surface, hot electrons produced in the metal with sufficient photon energy can be extracted into the conduction band of the semiconductor by overcoming the Schottky barrier. An

Electronic, Optical and Magnetic MaterialsMaterials Science
5
논문|인용수 22·2018
Enhancement of Hot Electron Flow in Plasmonic Nanodiodes by Incorporating PbS Quantum Dots
Changhwan Lee, Hyekyoung Choi, Ievgen I. Nedrygailov, Young Keun Lee, Sohee Jeong, Jeong Young Park
SJR Q1ACS Applied Materials & Interfaces

The enhancement of hot electron generation using plasmonic nanostructures is a promising strategy for developing photovoltaic devices. Here, we show that hot electron flow generated in plasmonic Au/TiO 2 nanodiodes by incident light can be amplified when PbS quantum dots are deposited onto the surface of the nanodiodes. The effect is attributed to efficient extraction of hot electrons via a three-dimensional Schottky barrier, thus giving new pathways for hot electron transfer. We also demonstrat

Materials ChemistryMaterials Science
6
논문|인용수 19·2015
Amplification of hot electron flow by the surface plasmon effect on metal–insulator–metal nanodiodes
Changhwan Lee, Ievgen I. Nedrygailov, Young Keun Lee, Changui Ahn, Hyosun Lee, Seokwoo Jeon, Jeong Young Park
SJR Q2Nanotechnology

Au-TiO2-Ti nanodiodes with a metal-insulator-metal structure were used to probe hot electron flows generated upon photon absorption. Hot electrons, generated when light is absorbed in the Au electrode of the nanodiode, can travel across the TiO2, leading to a photocurrent. Here, we demonstrate amplification of the hot electron flow by (1) localized surface plasmon resonance on plasmonic nanostructures fabricated by annealing the Au-TiO2-Ti nanodiodes, and (2) reducing the thickness of the TiO2.

Electronic, Optical and Magnetic MaterialsMaterials Science
7
논문|인용수 17·2000
Nonlinear analysis of the three-phase transformer considering the anisotropy with voltage source
Changhwan Lee, Hyun-Kyo Jung
SJR Q2IEEE Transactions on Magnetics

In this paper, the Newton-Raphson method, using two-directional (anisotropic) material properties, is applied to the analysis of a three-phase transformer. A new two-dimensional (2-D) model that reflects three-dimensional manufacturing effects, such as air-gap and overlapped stacking, is proposed. These effects cannot be dealt with by conventional 2-D methods. In addition, the new method obtains the current waveform phase difference with respect to the voltage source waveform. The analysis is pe

Electronic, Optical and Magnetic MaterialsMaterials Science
8
리뷰|인용수 17·2023
Photodarkening, Photobrightening, and the Role of Color Centers in Emerging Applications of Lanthanide-Based Upconverting Nanomaterials
Changhwan Lee, P. James Schuck
SJR Q1Annual Review of Physical ChemistryOA

Upconverting nanoparticles (UCNPs) compose a class of luminescent materials that utilize the unique wavelength-converting properties of lanthanide (Ln) ions for light-harvesting applications, photonics technologies, and biological imaging and sensing experiments. Recent advances in UCNP design have shed light on the properties of local color centers, both intrinsic and controllably induced, within these materials and their potential influence on UCNP photophysics. In this review, we describe fun

Materials ChemistryMaterials Science
9
논문|인용수 12·1994
A context-sensitive discretization of numeric attributes for classification learning
Changhwan Lee, Dong‐Guk Shin
European Conference on Artificial Intelligence
Artificial IntelligenceComputer Science
10
논문|인용수 9·2024
Lateralized displays reveal the perceptual locus of the syllable transposition effect in Korean
Sangyub Kim, Kevin B. Paterson, Kichun Nam, Changhwan Lee
SJR Q2Neuropsychologia
Experimental and Cognitive PsychologyPsychology
11
논문|인용수 8·2000
Two-dimensional analysis of three-phase transformer with load variation considering anisotropy and overlapped stacking
Changhwan Lee, Hyun‐Kyo Jung
SJR Q2IEEE Transactions on Magnetics

The design of a transformer should consider the analysis of the load variation. This paper describes the current wave calculation when the load condition varies for the newly proposed two-dimensional model in previous work, which can reflect the three-dimensional effects such as air gap and overlapped stacking. The analysis includes the Newton-Raphson method, considering two-directional (anisotropic) material properties. The methods are applied to the analysis of a three-phase transformer under

Electronic, Optical and Magnetic MaterialsMaterials Science
12
preprint|인용수 5·2022
Indefinite and Bidirectional Near Infrared Nanocrystal Photoswitching
Changhwan Lee, Emma Xu, Kevin W. C. Kwock, Ayelet Teitelboim, Yawei Liu, Natalie Fardian‐Melamed, Cássio Cardoso Santos Pedroso, Hye Sun Park, Jong-Woo Kim, Stefanie D. Pritzl, Sang Hwan Nam, Theobald Lohmueller
arXiv (Cornell University)OA

Materials whose luminescence can be switched by optical stimulation drive technologies ranging from superresolution imaging1-4, nanophotonics5, and optical data storage6-8, to targeted pharmacology, optogenetics, and chemical reactivity9. These photoswitchable probes, including organic fluorophores and proteins, are prone to photodegradation, and often require phototoxic doses of ultraviolet (UV) or visible light. Colloidal inorganic nanoparticles have significant stability advantages over exist

Pulmonary and Respiratory MedicineMedicine
13
논문|인용수 5·2022
Design of Type 3 High-Pressure Vessel Liner (Al 6061) for Hydrogen Vehicles
Changhwan Lee, Gunyoung Park, Chul Kim
SJR Q3Journal of Pressure Vessel Technology

Abstract The liner of type 3 high-pressure vessel is manufactured by a D.D.I. (Deep drawing and ironing) process for the cylinder part, which is a continuous process that includes a drawing process to reduce the diameter of the billet and a subsequent ironing process to reduce the thickness of the billet. But the wall thickness of type 3 pressure vessel liners used in vehicles and ships is required to be 5 mm. Excessive wall thickness not only increases the weight of hydrogen vehicles and ships

Mechanics of MaterialsEngineering
14
book chapter|인용수 4·2005
An Entropy-Based Approach for Generating Multi-dimensional Sequential Patterns
Changhwan Lee
SJR Q2Lecture notes in computer science
Information SystemsComputer Science
15
book chapter|인용수 4·1994
An instance-based learning method for databases: An information theoretic approach
Changhwan Lee
SJR Q2Lecture notes in computer science
Computer Networks and CommunicationsComputer Science

대표 연구 분야

Materials ChemistryElectronic, Optical and Magnetic MaterialsElectrical and Electronic EngineeringArtificial IntelligenceRenewable Energy, Sustainability and the EnvironmentAtomic and Molecular Physics, and Optics

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