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하이드라진 용액법으로 형성된 CuInSe₂ 다층 박막 분석
정중희(Choong-Heui Chung) 한국표면공학회 2015 한국표면공학회지 Vol.48 No.4
CuInSe₂ thin films which have been widely used for thin solar cells as a light absorber were prepared by hydrazine solution processing, and their microstructural properties were investigated. Hydrazine CuInSe₂ precursor solutions were prepared by dissolving Cu₂S, S, In₂Se₃ and Se powder in hydrazine solvent. Multilayer CuInSe₂ chalcopyrite phase thin films were prepared by repeating spin-coating process using the precursor solution. Unfortunately, the presence of the interfaces between each CuInSe₂ layer formed by multi-layer coating impeded grain growth across the interface. Here, by doing simple interface engineering to solve the limited grain growth issue, the large grained (~1 μm) CuInSe₂ thin films were obtained.
CIGS 박막태양전지를 위한 반사방지특성을 가진 용액공정 투명전극
박세웅,박태준,이상엽,정중희,Park, Sewoong,Park, Taejun,Lee, Sangyeob,Chung, Choong-Heui 한국재료학회 2020 한국재료학회지 Vol.30 No.3
Silver nanowire (AgNW) networks have been adopted as a front electrode in Cu(In,Ga)Se2 (CIGS) thin film solar cells due to their low cost and compatibility with the solution process. When an AgNW network is applied to a CIGS thin film solar cell, reflection loss can increase because the CdS layer, with a relatively high refractive index (n ~ 2.5 at 550 nm), is exposed to air. To resolve the issue, we apply solution-processed ZnO nanorods to the AgNW network as an anti-reflective coating. To obtain high performance of the optical and electrical properties of the ZnO nanorod and AgNW network composite, we optimize the process parameters - the spin coating of AgNWs and the concentration of zinc nitrate and hexamethylene tetramine (HMT - to fabricate ZnO nanorods. We verify that 10 mM of zinc nitrate and HMT show the lowest reflectance and 10% cell efficiency increase when applied to CIGS thin film solar cells.
전단코팅 공정으로 제조하는 금속-할라이드계 페로브스카이트의 박막성장에 미치는 공정변수의 영향 고찰
최지혜,송지호,정지영,정중희,김재균,홍기하,Choe, Jihye,Song, Jiho,Jeong, Jiyoung,Chung, Choong-Heui,Kim, Jaekyun,Hong, Ki-Ha 한국표면공학회 2019 한국표면공학회지 Vol.52 No.1
Metal-halide perovskite (MHP) solar cell is a promising candidate for next-generation flexible devices and the BIPV (Building-integrated photovoltaics) because it can exhibit high power conversion efficiencies over 23%, good bendability and low processing cost. However, MHP solar cells are commonly fabricated by the spin coating that is not a reliable method to produce large-scale commercial solar cells. A shear coating can be one of the potential candidates for the large-scale deposition method of MHP films. In this work, the influences of the process parameters such as solvents of precursor solution, substrate temperature, concentrations of precursor solution, and annealing time on the thin film growth of MHP were investigated for the shear coating process. This study presents the possibility of the shear coating process for large-scaled perovskite film fabrication and reveals the role of process condition in the thin film growth of perovskites.
구리 전기도금 방법을 이용한 은 나노와이어 투명전극의 전기전도도 향상
지한나,장지성,이상엽,정중희,Ji, Hanna,Jang, Jiseong,Lee, Sangyeob,Chung, Choong-Heui 한국재료학회 2019 한국재료학회지 Vol.29 No.5
Transparent conducting electrodes are essential components in various optoelectrical devices. Although indium tin oxide thin films have been widely used for transparent conducting electrodes, silver nanowire network is a promising alternative to indium tin oxide thin films owing to its lower processing cost and greater suitability for flexible device application. In order to widen the application of silver nanowire network, the electrical conductance has to be improved while maintaining high optical transparency. In this study, we report the enhancement of the electrical conductance of silver nanowire network transparent electrodes by copper electrodeposition on the silver nanowire networks. The electrodeposited copper lowered the sheet resistance of the silver nanowire networks from $21.9{\Omega}{\square}$ to $12.6{\Omega}{\square}$. We perform detailed X-ray diffraction analysis revealing the effect of the amount of electrodeposited copper-shell on the sheet resistance of the core-shell(silver/copper) nanowire network transparent electrodes. From the relationship between the cross-sectional area of the copper-shell and the sheet resistance of the transparent electrodes, we deduce the electrical resistivity of electrodeposited copper to be approximately 4.5 times that of copper bulk.
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.
Shear-coating을 사용한 은 나노와이어 투명 전극 제조 및 특성 분석
조경수(Kyung Soo Cho),홍기하(Ki-Ha Hong),박준식(Joon Sik Park),정중희(Choong-Heui Chung) 한국표면공학회 2020 한국표면공학회지 Vol.53 No.4
Indium tin oxide (ITO) used a transparent electrode of a photoelectric device has a low sheet resistance and a high transmittance. However, ITO is disadvantageous in that the process cost is expensive, and the process time is long. Silver nanowires (AgNWs) transparent electrodes are based on a low cost solution process. In addition, it has attracted attention as a next-generation transparent electrode material that replaces ITO because it has similar electrical and optical characteristic to ITO, it is noted as a. AgNW thin films are mainly produced by spin-coating. However, the spin-coating process has a disadvantage of high material loss. In this study, the material loss was reduced by using about 2∼10 ㎕ of AgNW solution on a (25 × 25) ㎟ substrate using the shear-coating method. It was also possible to align AgNWs in the drag direction by dragging the meniscus of the solution. The electro-optical properties of the AgNW thin film were adjusted by changing the experimental parameters that the amount of AgNWs suspension, the gap between the substrate and the blade, and the coating speed. As a result, AgNW thin films with a transmittance of 90.7 % at a wavelength of 550 ㎚ and a sheet resistance of 15 Ω/□ was deposited and exhibited similar properties to similar AgNW transparent electrodes studied by other researchers.