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노준홍 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
A number of cheap and solution-processable materials have been studied as photovoltaic active layer to develop inexpensive and highperformance photovoltaic systems. Organic materials with advantages for solution process at low temperature had attracted the great interest but the devices using them have a limit due to their low-performance. Recently, inorganic-organic hybrid materials such as CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> and CH(NH<sub>2</sub>)<sub>2</sub>PbI<sub>3</sub> have brought the surprising high performance in spite of using low-cost fabrication process. The materials have a AMX3 perovskite crystal structure so that photovoltaic devices using them are called by ‘perovskite solar cells’. The solution processed perovskite solar cells are showing high efficiency exceeding 20%. In this talk, the results for development of perovskite solar cells in KRICT will be introduced.
Influence of ZnO Seed Layers on Charge Transport in ZnO Nanorod-based Dye-Sensitized Solar Cells
노준홍,이숭해,이상욱,정현석 대한금속·재료학회 2008 ELECTRONIC MATERIALS LETTERS Vol.4 No.2
ZnO nanorod array films were deposited on seeded fluorine-doped tin oxide substrates with a chemical bath deposition method, and the dependence of the photovoltaic properties of the films on the annealing temperatures of seed layers was investigated. The energy conversion efficiency of ZnO nanorod-based DSSCs that contained seed layers annealed at 340°C was superior to that of DSSCs consisting of ZnO nanorods on seed layers annealed at 100°C. Electrochemical impedance spectroscopy revealed that the improved energy conversion efficiency is due to the enhancement in the electron transport within the seed layers.
페로브스카이트 결정 구조의 하이브리드 소재를 이용한 태양전지
노준홍 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Future photovoltaic systems require low-cost fabrication process and high power conversion efficiency for widespread use in the world. Recently, inorganic-organic (I/O) hybrid halide perovskite materials have attracted a great deal of attention in photovoltaic applications. The hybrid halide materials with a perovskite crystal structure are self-assembly formed by direct reaction between organic halides and inorganic metal halides, resulting in fabricating the solid-state solar cells through low-cost solution process. In addition, their performance surprisingly exceeded 20 % which value has been accepted to commercialize if their life-time is ensured. The high performance is mainly attributed to developments of device architecture, fabrication process, and manipulation of perovskite materials. In this talk, compositional and fabrication engineering for perovskite materials will be introduced for the high performance.
페로브스카이트 할로겐화물 박막의 발광 측정 조건에 따른 특성 분석
조현아,이승민,노준홍,Cho, Hyeonah,Lee, Seungmin,Noh, Jun Hong 한국재료학회 2022 한국재료학회지 Vol.32 No.10
Halide perovskite solar cells (PSCs) have improved rapidly over the past few years, and research on the optoelectrical properties of halide perovskite thin films has grown as well. Among the characterization techniques, photoluminescence (PL), a method of collecting emitted photons to evaluate the properties of materials, is widely applied to evaluate improvements in the performance of PSCs. However, since only photons emitted from the film in the escape cone are included, the photons collected in PL are a small fraction of the total photons emitted from the film. Unlike PSCs power conversion efficiency, PL measuring methods have not been standardized, and have been evaluated in a variety of ways. Thus, an in-depth study is needed of the methods used to evaluate materials using PL spectra. In this study, we examined the PL spectra of the perovskite light harvesting layer with different measurement protocols and analyzed the features. As the incident angle changed, different spectra were observed, indicating that the PL emission spectrum can depend on the measuring method, not the material. We found the intensity and energy of the PL spectra changes were due to the path of the emitted photons. Also, we found that the PL of halide perovskite thin films generally contains limited information. To solve this problem, the emitted photons should be collected using an integrating sphere. The results of this study suggest that the emission spectrum of halide perovskite films should be carefully interpreted in accordance with PL measuring method, since PL data is mostly affected by the method.
다이메틸암모늄 유도 CsPbI3 페로브스카이트 상의 상전이 거동에 대한 열과 수분의 영향
강소현,이승민,노준홍 한국재료학회 2023 한국재료학회지 Vol.33 No.8
Cesium lead iodide (CsPbI3) with a bandgap of ~1.7 eV is an attractive material for use as a wide-gap perovskite in tandem perovskite solar cells due to its single halide component, which is capable of inhibiting halide segregation. However, phase transition into a photo inactive δ-CsPbI3 at room temperature significantly hinders performance and stability. Thus, maintaining the photo-active phase is a key challenge because it determines the reliability of the tandem device. The dimethylammonium (DMA)-facilitated CsPbI3, widely used to fabricate CsPbI3, exhibits different phase transition behaviors than pure CsPbI3. Here, we experimentally investigated the phase behavior of DMA-facilitated CsPbI3 when exposed to external factors, such as heat and moisture. In DMA-facilitated CsPbI3 films, the phase transition involving degradation was observed to begin at a temperature of 150 °C and a relative humidity of 65 %, which is presumed to be related to the sublimation of DMA. Forming a closed system to inhibit the sublimation of DMA significantly improved the phase transition under the same conditions. These results indicate that management of DMA is a crucial factor in maintaining the photo-active phase and implies that when employing DMA designs are necessary to ensure phase stability in DMA-facilitated CsPbI3 devices.
주석-납 기반 페로브스카이트 고농도 전구체 용액을 이용한 광전류 향상 연구
홍효진,이승민,임정민,노준홍 한국태양광발전학회 2023 Current Photovoltaic Research Vol.11 No.3
Sn-Pb narrow-bandgap perovskite solar cells, which is a light-harvesting layer thicker than 1.3 micrometers, is needed to enhance the low photocurrent. The fabrication of such a thick film through solution processing is a key challenge. Here, we studied and characterized the film by using a precursor solution of increased concentration, comparing it with the universally used 1-micrometer Sn-Pb perovskite film. The increase in molar concentration clearly induced thickness enhancement, but we observed that it also created numerous voids at the interface with bottom charge transporting layer. We hypothesized that these voids might hinder the increase in photocurrent associated with thickness enhancement. By introducing methylammonium chloride (MACl), we successfully fabricated Sn-Pb perovskite film with a thickness of 1.3 micrometer and no voids. Void-controlled Sn-Pb perovskite solar cells not only demonstrated superior short-circuit current density compared to those with voids but also operated smoothly under light exposure.