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Citrate 농도에 따른 수용액 화학조 증착 ZnO 성장 및 ZnO 박막의 Cu(In,Ga)Se<sub>2</sub> 태양전지 응용
조경수,장현준,오재영,김재우,이준수,최예솔,홍기하,정중희,Cho, Kyung Soo,Jang, Hyunjun,Oh, Jae-Young,Kim, Jae Woo,Lee, Jun Su,Choi, Yesol,Hong, Ki-Ha,Chung, Choong-Heui 한국재료학회 2020 한국재료학회지 Vol.30 No.4
ZnO thin films are of considerable interest because they can be customized by various coating technologies to have high electrical conductivity and high visible light transmittance. Therefore, ZnO thin films can be applied to various optoelectronic device applications such as transparent conducting thin films, solar cells and displays. In this study, ZnO rod and thin films are fabricated using aqueous chemical bath deposition (CBD), which is a low-cost method at low temperatures, and environmentally friendly. To investigate the structural, electrical and optical properties of ZnO for the presence of citrate ion, which can significantly affect crystal form of ZnO, various amounts of the citrate ion are added to the aqueous CBD ZnO reaction bath. As a result, ZnO crystals show a nanorod form without citrate, but a continuous thin film when citrate is above a certain concentration. In addition, as the citrate concentration increases, the electrical conductivity of the ZnO thin films increases, and is almost unchanged above a certain citrate concentration. Cu(In,Ga)Se<sub>2</sub> (CIGS) solar cell substrates are used to evaluate whether aqueous CBD ZnO thin films can be applicable to real devices. The performance of aqueous CBD ZnO thin films shows performance similar to that of a sputter-deposited ZnO:Al thin film as top transparent electrodes of CIGS solar cells.
풍력 발전 시스템의 T-bolt 체결부 해석에 관한 연구
조경수(Kyung-Su Cho),이상훈(Sang-Hoon Lee),박지상(Ji-Sang Park) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
This study is to determine a pre-tension value applied to T-bolt which is part used for connecting wind turbine blade to hub. A variety of loads are occurred among parts of the wind turbine system while it is operated. The load in the direction of the blade span by total bending moment seriously affects the safety of the T-bolt. Proper pretension should be thus applied to the T-bolt for safe operation of the wind turbine system. A equations given by VDI 2230 are used for analytical calculation and finite element analysis are used for comparison between results.