Young‐Chang Joo
서울대학교 재료공학부 · 공학
Young-Chang Joo 교수의 연구실은 광전기화학 및 유연 전자소자 분야에서 핵심적인 연구를 수행하고 있습니다. 특히 헤마티트(α-Fe₂O₃) 기반 광반도체에서 산소 공여 결함과 도핑의 상호작용이 광전류에 미치는 영향을 깊이 있게 분석하며, 유연한 전자소자의 내구성과 전기적 안정성 향상을 위한 기계적 변형과 전자 이동성의 상관관계를 규명하고 있습니다. 또한 비정질 산화물에서의 산소 공여 결함의 전자 상태 제어 및 구조적 안정화 메커니즘을 새로운 장치 구조를 통해 규명하고 있어, 에너지 변환 및 전자 소자 응용에 기여하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
PSS are well preserved during the mechanical deformation.
The enhancement of the electrical conductivity by doping is important in hematite (α-Fe(2)O(3)) photoanodes for efficient solar water oxidation. However, in spite of many successful demonstrations using extrinsic dopants, such as Sn, Ti, and Si, the achieved photocurrent is still lower than the practical requirement. There is still lack of our understanding of how intrinsic oxygen defects can change the photocurrent and interact with the extrinsic dopants. In this study, we systematically invest
As the technology of flexible electronics has remarkably advanced, the long-term reliability of flexible devices has attracted much attention, as it is an important factor for such devices in reaching real commercial viability. To guarantee the bending fatigue lifetime, the exact evaluation of bending strain and the change in electrical resistance is required. In this study, we investigated the bending strains of Cu thin films on flexible polyimide substrates with different thicknesses using mon
Hematite (α-Fe2O3) has been attracting attention for photoelectrochemical water oxidation due to its visible light photon absorption capacity and high chemical stability, but the short-diffusion length of holes and the large overpotential are still challenging to overcome. Here, in an effort to address these challenges, we develop a hierarchically nanostructured photoanode composed of iron-oxides; Ti-doped hematite nanorods are decorated with an undoped hematite underlayer and β-FeOOH nano-branc
Passivated and unpassivated Al single-crystal lines with (110), (133), and (111) planes parallel to the substrate have been fabricated and electromigration tests have been performed to study transgranular failure mechanisms. Both erosion voids and slitlike voids with {111} facets were observed in single-crystal lines. The slitlike voids lie along the in-plane direction, which leads to minimum-surface-area voids among the crystallographically possible directions for the {111}-faceted voids. Voids
The electronic states of oxygen vacancies (VO s) in amorphous oxide semiconductors are shallow donors, deep donors or electron traps; these are determined by the local atomic structure. Because the amorphous phase is metastable compared with the crystalline phase, the degree of structural disorder is likely to decrease, which is referred to as structural relaxation (SR). Thus SR can affect the VO electronic state by changing the local atomic conditions. In this study, we demonstrated that electr
Ultra-small tin (Sn) nanoparticle embedded carbon (C) nanofibers are successfully fabricated by porosity control and they exhibit outstanding anode performance in all-solid-state batteries without current collectors and additives.
Precise control of the oxidation state of transition-metal oxides, such as copper, is important for high selectivity of CO<sub>2</sub> reduction in an aqueous condition to compete with the reduction of water. The phase of copper oxide nanofibers was controlled by predictive synthesis, which controls the nanoscale gas-solid reaction by considering thermodynamics and kinetics. The driving force of the phase transformation between the different oxidation states of copper oxide is calculated by comp
