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허수원,이의진,한용운,이요셉,이원재,좌성훈,김용성,문두경 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
The indium-zinc-tin-oxide (IZTO) target, which consisted of 70 at.% In2O3 15 at.% ZnO 15 at.% SnO2, was manufactured to replace indium-tin-oxide (ITO). The flexible IZTO (FIZTO) transparent electrodes were deposited on polyimide (PI) films at temperatures ranging from room temperature to 300 C. The mechanical, optical and electrical properties of the FIZTO films and the flexible polymer light emitting diodes (FPLEDs) were characterized. Amorphous FIZTO prepared at 50 C showed the best performance. The optimized FPLEDs exhibited 31% and 9% enhanced maximum brightness and luminance efficiency, respectively, as compared to PLEDs with an ITO glass. In addition, the FPLEDs worked normally in the stretching and twisting state at 3.2% and 58, respectively.
Enhanced performance and stability in quantum dot solar cells with metal nanoparticle buffer layer
허수원,문두경 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Near-infrared PbS quantum dots (QDs) have emerged as promising candidates for photovoltaic applications because of a tunable energy band-gap that covers the optimal band-gap range for single and multijunction solar cells. However, fabrication of these recent QD devices requires high-temperature annealing (>500°C) of the TiO<sub>2</sub> buffer layer or two different processing atmospheres, including an inert gas environment In this study, we demonstrate metal nanoparticle / PbS solar cells in which the PbS QD and metal nanocrystals are both solution-processed in air and at room temperature. By controlling the crystalline size of the nanoparticles and the thickness of buffer layers, the efficiency of device was enhanced. Furthermore, the performance of devices remains unchanged for over 30 days.
Combined Orbital Fractures: Surgical Strategy of Sequential Repair
허수원,김성은,정규진,이준호,김태곤,김용하 대한성형외과학회 2015 Archives of Plastic Surgery Vol.42 No.4
Background Reconstruction of combined orbital floor and medial wall fractures with a comminuted inferomedial strut (IMS) is challenging and requires careful practice. We present our surgical strategy and postoperative outcomes. Methods We divided 74 patients who underwent the reconstruction of the orbital floor and medial wall concomitantly into a comminuted IMS group (41 patients) and non-comminuted IMS group (33 patients). In the comminuted IMS group, we first reconstructed the floor stably and then the medial wall by using separate implant pieces. In the non-comminuted IMS group, we reconstructed the floor and the medial wall with a single large implant. Results In the follow-up of 6 to 65 months, most patients with diplopia improved in the firstweek except one, who eventually improved at 1 year. All patients with an EOM limitation improved during the first month of follow-up. Enophthalmos (displacement, 2 mm) was observed in two patients. The orbit volume measured on the CT scans was statistically significantly restored in both groups. No complications related to the surgery were observed. Conclusions We recommend the reconstruction of orbit walls in the comminuted IMS group by using the following surgical strategy: usage of multiple pieces of rigid implants instead of one large implant, sequential repair first of the floor and then of the medial wall, and a focus on the reconstruction of key areas. Our strategy of step-by-step reconstruction has the benefits of easy repair, less surgical trauma, and minimal stress to the surgeon.