Ji‐Beom Yoo
성균관대학교 신소재공학부 · 공학
유 교수의 연구실은 나노소재 합성과 응용에 초점을 맞추고 있으며, 특히 그래핀 및 이차원 물질의 저비용 대량 합성, 화학적 기능화를 통한 전기적 성질 제어, 반도체 나노구조(예: ZnO, CdS, In₂S₃, TiO₂)의 설계 및 광전기적 응용을 핵심 연구 방향으로 삼고 있습니다. 다양한 나노구조(나노튜브, 나노로드, 나노섬유 등)를 제어적으로 합성하고, 태양전지 및 광촉매 등 에너지 응용 분야에서의 성능 향상을 목표로 하고 있습니다. 특히 표면 구조 제어와 전기적·광학적 특성 조절을 통해 고효율 에너지 변환 소자 개발에 기여하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Easily soluble expanded graphite is synthesized in a one-step exfoliation process that can be used for the lowcost mass production of graphene for various applications because of the simplicity and speed of the process. The graphene obtained is sufficiently expanded to be dispersed in aqueous solutions with an ordinary surfactant and in organic solvents.
The transport mechanisms in ZnO/CdS/CuInSe2 solar cells prepared by ARCO (now Siemens) Solar Inc. have been analyzed by measurements of current versus voltage at different temperatures in the dark, short-circuit current versus open-circuit voltage at different temperatures in the light, spectral response of quantum efficiency, and junction capacitance. In the dark, recombination in the depletion region and/or thermally assisted tunneling are the dominant transport mechanisms. The observation of
Beta-In(2)S(3) nanotubes were synthesized using an organic solution pyrolysis route. The shape of the beta-In(2)S(3) nanotubes was controlled from hexagonal nanoplates to nanotubes simply by changing the reaction time. The growth mechanism of the nanotubes was explained by oriented attachment. The beta-In(2)S(3) nanotubes had a diameter, wall thickness and length of 5.0 nm, 0.79 nm and >10 microm, respectively. The diameter of the beta-In(2)S(3) nanotubes was found to be dependent on the sulfur
Dry etching plasma parameters were optimized for texturing single crystalline thin silicon solar cells and hence for high efficiency. In reactive ion etching (RIE) texturing, a low etch depth (∼2 µm) was obtained compared with the etch depth that occurred in the wet chemical texturing process. For the flow ratios (SF6/O2) of 2 and 3, needle-like and cylindrical type structured surfaces were obtained. In the RIE process, the effects of working pressure, flow ratio, and etching time on reflectance
Abstract Semi‐ionically fluorinated graphene (s‐FG) is synthesized with a one step liquid fluorination treatment. The s‐FG consists of two different types of bonds, namely a covalent C‐F bond and an ionic C‐F bond. Control is achieved over the properties of s‐FG by selectively eliminating ionic C‐F bonds from the as prepared s‐FG film which is highly insulating (current < 10 −13 A at 1 V). After selective elimination of ionic C‐F bonds by acetone treatment, s‐FG recovers the highly conductive
Three-dimensional hierarchical nanostructures of TiO2, consisting of high density nanorods on nanofibers, were synthesized by the combination of electrospinning, thermal annealing and hydrothermal methods. The morphologies, crystal structures, surface area, band gap and photocatalytic activity of the hierarchical nanostructures were characterized by Raman microscopy, X-ray diffraction, UV-vis spectroscopy, scanning electron microscopy, transmission electron microscopy and surface area analysis.
To solve the problems of the Si anode such as excessive volume expansion and the corresponding destruction of the solid electrolyte interface (SEI) film, we propose a porous MoS<sub>2</sub>@C heteroshell with a Si yolk structure.
