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1페로브스카이트 태양전지용 주석 기반 할로겐화물 연구동향

저자 : 민창하 , 노준홍

발행기관 : 대한금속재료학회(구 대한금속학회) 간행물 : 재료마당 34권 4호 발행 연도 : 2021 페이지 : pp. 4-15 (12 pages)

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2페로브스카이트 태양전지에서의 저온 용액 공정의 BCP 버퍼층 효과

저자 : 정민수 ( Minsu Jung ) , 최인우 ( In Woo Choi ) , 김동석 ( Dong Suk Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 1호 발행 연도 : 2021 페이지 : pp. 73-77 (5 pages)

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Inorganic-organic hybrid perovskite solar cells have demonstrated considerable improvements, reaching 25.5% of certified power conversion efficiency in 2020 from 3.8% in 2009. In normal structured perovskite solar cells, TiO2 electrontransporting materials require heat treatment process at a high temperature over 450℃ to induce crystallinity. Inverted perovskite solar cells have also been studied to exclude the additional thermal process by using [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as a non-oxide electron-transporting layer. However, the drawback of the PCBM layer is a charge accumulation at the interface between PCBM and a metal electrode. The impact of bathocuproin (BCP) buffer layer on photovoltaic performance has been investigated herein to solve the problem of PCBM. 2-mM BCP-modified perovskite solar cells were observed to exhibit a maximum efficiency of 12.03% compared with BCP-free counterparts (5.82%) due to the suppression of the charge accumulation at the PCBM-Au interface and the resulting reduction of the charge recombination between perovskite and the PCBM layer.

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3A-site 조성 제어를 통한 FA기반 페로브스카이트의 상안정화 및 전단 코팅 최적화 연구

저자 : 김한솔 ( Hansol Kim ) , 구혜원 ( Hyewon Gu ) , 송민주 ( Minju Song ) , 정중희 ( Choong-heui Chung ) , 오용준 ( Yong-jun Oh ) , 송창은 ( Chang Eun Song ) , 홍기하 ( Ki-ha Hong )

발행기관 : 대한금속재료학회(구 대한금속학회) 간행물 : 대한금속재료학회지 59권 5호 발행 연도 : 2021 페이지 : pp. 321-328 (8 pages)

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Halide perovskite solar cells have been attracting tremendous attention as next-generation solar cell materials because of their excellent optical and electrical properties. Formamidinium lead tri-iodide (FAPbI3) exhibits the narrowest band gap among lead iodide perovskites and shows excellent thermal and chemical stability, also. However, the large-area coating of FAPbI3 needed for commercialization has not been successful because of the instability of the black phase of FAPbI3 at ambient temperature. This study presents a compositional engineering direction to control the polymorph of the FAPbI3 thin film for the shear coating processes, without halide mixing. By adopting a hot substrate above 100 ℃, our shear coating process can produce the black phase FA-based halide perovskites without halide mixing. We carefully investigate the Cs- FA and MA-FA mixed lead iodide perovskites’ phase stability by combining the study with thin-film fabrication and ab initio calculations. Cs-FA mixing shows promising behaviors for stabilizing α-FAPbI3 (black phase) compared with MA-FA. Stable FA-rich perovskite films cannot be achieved via shear coating processes with MA-FA mixing. Ab initio calculations revealed that Cs-FA mixing is excellent for inhibiting phase decomposition and water incorporation. This study is the first report that FA-based halide perovskite thin films can be made with the shear coating process without MA-Br mixing. We reveal the origin of the stable film formation with Cs-FA mixing, and present future research directions for fabricating FA-based perovskite thin films using shear coating. (Received January 14, 2021; Accepted March 4, 2021)

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4ZrO2 전자전달층 두께에 따른 우레아 첨가 페로브스카이트 태양전지의 물성

저자 : 김광배 ( Kwangbae Kim ) , 송오성 ( Ohsung Song )

발행기관 : 대한금속재료학회(구 대한금속학회) 간행물 : 대한금속재료학회지 59권 1호 발행 연도 : 2021 페이지 : pp. 67-72 (6 pages)

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The properties of 6 mM urea added perovskite solar cells (PSCs) according to ZrO2 electron transport layer (ETL) thicknesses of 204, 221, 254, and 281 nm were examined. A solar simulator was used to characterize the photovoltaic properties of the cell. Optical microscopy and field emission scanning electron microscope were used for the microstructure analysis, and a 3D profiler was used to analyze surface roughness. UV-VIS-NIR was used to analyze transmittance. From the photovoltaic analysis result, an energy conversion efficiency (ECE) of 14.93% was exhibited by the cell with a 221 nm-ZrO2 layer and added urea. From the analysis result of microstructure and surface roughness, 384 nm grain size was obtained through appropriate surface roughness of base layer for perovskite growth and the grain size coarsening by the urea under the 221 nm-ZrO2 condition. For this reason, ECE increased as the resistance of the grain boundary decreased. When the thickness of the ETL was increased above 250 nm-ZrO2, the ECE decreased due to the reduction in light transmittance, and light reaching the perovskite layer. Therefore, the ECE of PCS could be enhanced by selecting a ZrO2 layer with the appropriate thickness and the addition of urea. (Received October 12, 2020; Accepted December 5, 2020)

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7태양에너지 시스템에 적합한 표준기상데이터의 제작과 일사량 데이터 분석

저자 : 이현진 ( Hyun-jin Lee ) , 김신영 ( Shin-young Kim ) , 윤창열 ( Chang-yeol Yun )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 13권 3호 발행 연도 : 2017 페이지 : pp. 24-33 (10 pages)

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The typical meteorological year (TMY) data reflect the long-term meteorological characteristics in a specific location and thereby serve as critical input in solar energy simulations. On the other hand, domestically, only a few of studies have been dedicated to TMY data with reliable solar irradiance and their analysis. We generated new TMY data of 10 major cities using the meteorological data from 1991 to 2010 measured by the Korea Meteorological Administration (KMA). To generate TMY data suitable for solar energy systems, we applied a better solar decomposition model for direct normal irradiance (DNI) and the generation method by National Renewable Energy Laboratory (NREL). We analyzed the new TMY solar irradiance data by comparisons with the 20-year long-term means, data provided by Korean Solar Energy Society (KSES), and data included in the TRNSYS and PVsyst programs. Finally, we demonstrated that the TMY data proposed in this study represent the solar irradiance more appropriately.

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8수소생산을 위한 태양열 이용 메탄 분해 반응기 개발

저자 : 김하늘 ( Haneol Kim ) , 김종규 ( Jongkyu Kim )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 17권 2호 발행 연도 : 2021 페이지 : pp. 40-49 (10 pages)

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This paper explains the development process of methane decomposition to hydrogen and carbon black using solar thermal energy. It also demonstrates the advantages and disadvantages of five different reactors for each development stage, including the reactor's experimental results. Starting with the initial direct heating type reactor, the indirect heating type reactor was developed through five modifications. The 40-kWth solar furnace installed at the Korea Institute of Energy Research was used for the experiment. In the experiment using the developed indirect heating reactor, an 89.0% methane to hydrogen conversion rate was achieved at a methane flow rate of 40 L/min, obtained at about twice the flow rate compared to previous advanced studies.

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9태양열 이용 바이오메탄 분해 해석연구

저자 : 김하늘 ( Haneol Kim ) , 이상남 ( Sangnam Lee ) , 이상직 ( Sang Jik Lee ) , 김종규 ( Jongkyu Kim )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 17권 1호 발행 연도 : 2021 페이지 : pp. 40-49 (10 pages)

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In this study, the optical properties, heat transfer capabilities and chemical reaction performance of a methane thermal decomposition reactor using solar heat as a heat source were numerically analyzed on the basis of the cavity shape. The optical properties were analyzed using TracePro, a Monte Carlo ray tracing-based program, and the heat transfer analysis was performed using Fluent, a CFD program. An indirect heating tubular reactor was rotated at a constant speed to prevent damage by the heat source in the solar furnace. The inside of the reactor was filled with a porous catalyst for methane decomposition, and the outside was insulated to reduce heat loss. The performance of the reactor, based on cavity shape, was calculated when solar heat was concentrated on the reactor surface and methane was supplied into the reactor in an environment with a solar irradiance of 700 W/㎡, a wind speed of 1 m/s, and an outdoor temperature of 25°C. Thus, it was confirmed that the heat loss of the full-cavity model decreased to 13% and the methane conversion rate increased by 33.5% when compared to the semi-cavity model.

10태양전지를 기반으로 한 에너지 하베스트 스마트 섬유 연구 동향

저자 : 배종혁 , 이우성

발행기관 : 한국섬유공학회 간행물 : 섬유기술과 산업 24권 3호 발행 연도 : 2020 페이지 : pp. 173-183 (11 pages)

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