• Enhancement of Electrical Resistivity in Low-temperature Curing Silver Paste by Mixing Silver Powders with Different Particle Size Distribution

    입도 분포가 다른 은의 혼합을 통한 저온 경화 은 페이스트의 비저항 개선에 관한 연구

    Jiyeon Moon, Hyunsoo Lim, Sung Hyun Kim

    문지연, 임현수, 김성현

    Heterojunction technology (HJT) solar cells, known for their high efficiency, utilize a heterojunction structure combining crystalline and amorphous silicon layers. Due to … + READ MORE
    Heterojunction technology (HJT) solar cells, known for their high efficiency, utilize a heterojunction structure combining crystalline and amorphous silicon layers. Due to the structural characteristics of HJT cells, low-temperature processing is necessary for their production, which presents challenges in electrode formation compared to traditional high-temperature methods. Low-temperature curable silver pastes, essential for this process, generally have lower conductivity than high-temperature sintered electrodes due to reduced silver particle connectivity and residual binder. To solve these problems, low-temperature curable pastes are typically manufactured with increased silver content, which has the effect of improving conductivity, but at the same time increases the production cost. Therefore, it is crucial to find ways to enhance the electrical properties of these pastes without increasing the silver content. In this study, the resistivity of low-temperature curable pastes was evaluated by mixing silver particles with different size distributions. Four types of silver particles with varying shapes and size distributions were used to formulate three types of silver-mixed pastes. After screen-printing and curing, the resistance and thickness of the cured pastes were measured. The relationship between the silver particles used and the calculated resistivity was analyzed, confirming that resistivity can be improved without increasing the silver content. - COLLAPSE
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    31 December 2024
  • Research Trends in Electron Transport Layers and Stability for PM6:Y6-based Organic Solar Cells

    PM6:Y6 기반 유기 태양전지를 위한 전자 수송층과 안정성 연구 동향

    Hye Seon Shin, Dong Hwan Yun, Yun Hye Jeong, Gwang Youg Shin, Young Chae Cho, Gi-Hwan Kim

    신혜선, 윤동환, 정윤혜, 신광용, 조영채, 김기환

    Recently, the need for alternative energy sources has been increasing due to environmental pollution caused by the rising use of fossil fuels. … + READ MORE
    Recently, the need for alternative energy sources has been increasing due to environmental pollution caused by the rising use of fossil fuels. Among alternative energies, solar cells that utilize endless sunlight are attracting significant attention. In particular, organic solar cells offer advantages such as low cost, solution processing, and flexible device fabrication. However, they suffer from low power conversion efficiency and instability due to a limited absorption spectrum. In response, high efficiency has been achieved using PM6:Y6, a photoactive layer organic semiconductor with a broad absorption range in the near-infrared region, reaching 18.2% efficiency with electron transport layers. Although organic solar cells show high efficiency, their relatively low stability limits their commercialization. This review will introduce the inorganic/organic electron transport layers of PM6:Y6-based organic solar cells and discuss the impact of light and heat among the various factors contributing to their low stability.>Recently, the need for alternative energy sources has been increasing due to environmental pollution caused by the rising use of fossil fuels. Among alternative energies, solar cells that utilize endless sunlight are attracting significant attention. In particular, organic solar cells offer advantages such as low cost, solution processing, and flexible device fabrication. However, they suffer from low power conversion efficiency and instability due to a limited absorption spectrum. In response, high efficiency has been achieved using PM6:Y6, a photoactive layer organic semiconductor with a broad absorption range in the near-infrared region, reaching 18.2% efficiency with electron transport layers. Although organic solar cells show high efficiency, their relatively low stability limits their commercialization. This review will introduce the inorganic/organic electron transport layers of PM6:Y6-based organic solar cells and discuss the impact of light and heat among the various factors contributing to their low stability. - COLLAPSE
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    31 December 2024
  • Trends of Metal Halide Additives into Quasi-2D Perovskite Light-Emitting Diodes

    준-2차원 페로브스카이트 발광 다이오드의 금속 할라이드 첨가제 연구 동향

    Gwang Yong Shin, Donghwan Yun, Yunhye Jeong, Youngchae Cho, Hyeseon Shin, Pasaribu Donny Maruli, Seungmin Baek, Mihyun Kim, Harin Kim, Gi-Hwan Kim

    신광용, 윤동환, 정윤혜, 조영채, 신혜선, PasaribuDonny Maruli, 백승민, 김미현, 김하린, 김기환

    Metal halide perovskites have attracted tremendous attention due to their superior photoelectric properties, which led to light-emitting diodes (LEDs) applications. To enhance … + READ MORE
    Metal halide perovskites have attracted tremendous attention due to their superior photoelectric properties, which led to light-emitting diodes (LEDs) applications. To enhance the poor performance of blue LEDs compared to green and red LEDs, quasi-2-dimensional perovskites, which have the energy funneling effect, were chosen. To maximize the energy funneling effect, it is necessary to rearrange the 2-dimensional phase distribution. The shortened energy transfer pathway can improve radiative recombination. Here, we introduce a variety of metal halide additives for high-performance perovskite LEDs. - COLLAPSE
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    31 December 2024
  • Optimization Strategy for Passivation of Perovskite thin Films via Anti-solvent Additive Method

    최적화된 Anti-solvent 첨가물 방법을 이용한 페로브스카이트 박막 패시베이션

    Wonjong Lee, Muhammad Adnan, Zobia Irshad, Sunkyu Kim, Siwon Yun, Hyeji Han, Jongchul Lim

    이원종, MuhammadAdnan, ZobiaIrshad, 김선규, 윤시원, 한혜지, 임종철

    An anti-solvent additive method is one of process for passivating defect to improve the crystal quality, stability, and suppressing charge losses. The … + READ MORE
    An anti-solvent additive method is one of process for passivating defect to improve the crystal quality, stability, and suppressing charge losses. The functional groups of additives can interact with perovskite ions and it can prevent ion vacancies and defects. However, due to different polarity between additives and anti-solvent, the additives have less solubility in the anti-solvent. Herein, we propose a method to optimize the dissolution of additives in anti-solvents, and observe the characteristics of perovskite films produced by the anti-solvent additive method through spectroscopy analysis. We obtained the solubility of additives through absorbance and predicted the unsaturation concentration. In addition, the passivated perovskite films by optimized concentration showed different passivation effects according to additives. - COLLAPSE
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    31 December 2024
  • Enhancement of CO2 Reduction Performance and Ethanol Selectivity of Gas Diffusion Electrodes by Optimizing Copper Deposition Conditions

    구리 증착 조건에 따른 가스확산전극의 이산화탄소 환원 성능 및 에탄올 선택성 향상

    Chaewon Seong, Jiwon Heo, Jun-Seok Ha

    성채원, 허지원, 하준석

    The electrochemical carbon dioxide reduction reaction (eCO2RR) has garnered significant attention as a promising approach for converting carbon dioxide, a … + READ MORE
    The electrochemical carbon dioxide reduction reaction (eCO2RR) has garnered significant attention as a promising approach for converting carbon dioxide, a major greenhouse gas, into valuable carbon-based products. Among available catalysts, copper (Cu) stands out as the potential candidate capable of producing C2+ compounds during eCO2RR. However, its practical application is hindered by limitations such as low stability, efficiency, and selectivity, requiring further investigation. This study addresses these challenges by employing a gas diffusion electrode (GDE) to enhance the efficiency and selectivity of Cu-based catalysts. The GDE@Cu electrode was fabricated via electrodeposition, and its eCO2RR performance was systematically evaluated under varying Cu deposition times to optimize the fabrication process. The findings demonstrated that the GDE@Cu electrode achieved a Faradaic efficiency (FE) exceeding 50% for ethanol production, underscoring the efficacy of electrodeposited Cu on GDE in facilitating C2 hydrocarbon generation. This optimized strategy highlights the potential of Cu-based catalysts for improved performance in eCO2RR applications. - COLLAPSE
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    31 December 2024
  • Study on the Maximum Power of Flexible Shingled Photovoltaic Modules with Color Films for BIPV Applications

    BIPV 적용을 위한 컬러 필름 기반 유연 슁글드 태양광 모듈의 출력 특성 연구

    Kiseok Jeon, Min-Joon Park, Sung-Mi Youn, Jonghyeok Lee, Chaehwan Jeong

    전기석, 박민준, 윤성민, 이종혁, 정채환

    The BIPV module can directly convert solar energy into electricity, thereby reducing the energy consumption of buildings, and it is suitable for … + READ MORE
    The BIPV module can directly convert solar energy into electricity, thereby reducing the energy consumption of buildings, and it is suitable for domestic distribution as it does not require separate installation land, which is ideal for a country with limited land area and high population density. However, conventional silicon (Si) photovoltaic (PV) modules have used a monotonous black appearance to maximize solar energy conversion, resulting in design issues that hindered market activation. In response, methods for colorizing BIPV modules have been intensively studied to promote market adoption. However, the color of solar cells is achieved by reflecting or transmitting visible light through the cells, which implies optical losses from the perspective of solar energy conversion. To find the optimal balance between efficiency and aesthetics, the color and brightness must be determined in a way that minimizes optical losses and maximizes conversion efficiency. In this study, a colored flexible module suitable for BIPV was fabricated and its characteristics were analyzed. The yellow film showed the narrowest transmittance reduction band and the lowest degree of decrease in transmittance, making it ideal for minimizing efficiency loss compared to other colored products. - COLLAPSE
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    31 December 2024
  • Performance Prediction and Validation of Fence-Type Bifacial PV Systems Across Rural Sites Based on Bifaciality Factors

    양면발전 계수에 따른 농어촌용 펜스형 양면 PV 시스템의 발전량 예측 및 검증

    Jeonghun Park, Ho-Jun Jung, Hyeongno Lee, Chang-Sik Son, Donghyun Hwang

    박정훈, 정호준, 이형로, 손창식, 황동현

    This study investigates the power prediction and performance of bifacial photovoltaic (PV) systems installed at four demonstration sites, including a fruit farm, … + READ MORE
    This study investigates the power prediction and performance of bifacial photovoltaic (PV) systems installed at four demonstration sites, including a fruit farm, a regular field, a rice field, and a salt field. A fence-type bifacial PV system was installed at each site, and power generation was predicted using bifaciality factors (BF) ranging from 0.50 to 0.75. The predicted results were then compared with actual power data collected over the demonstration period. The results revealed that the impact of bifaciality factors on the accuracy of power generation predictions varied by site. At the fruit farm and regular field, higher BF values resulted in larger discrepancies between predicted and measured power generation, with an overestimation of predicted values. This indicates that environmental factors, such as shading and reflectivity, negatively impacted the rear-side power generation of bifacial modules in these locations, suggesting the need for further optimization of BF application in such environments. In contrast, the rice field and salt field exhibited a decrease in prediction error as BF values increased. Notably, the rice field demonstrated the most accurate prediction at a BF value of 0.65, with an error rate of 0%, while the salt field achieved a minimal error rate of 1% at a BF value of 0.75. These results suggest that high-reflectivity environments, such as the salt field, benefit from higher BF values, leading to more accurate power generation predictions. - COLLAPSE
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    31 December 2024
  • Photoelectrodeposition of NiMo Catalyst on Cu2O Photocathodes for Enhanced Solar-to-Hydrogen Energy Conversion
    Ji Hoon Choi, Ji Hye Jeong, Hak Hyeon Lee, Hyung Koun Cho
    Photoelectrochemical (PEC) water splitting offers an eco-friendly method to convert solar energy into hydrogen, with recent advancements improving efficiency. However, despite direct … + READ MORE
    Photoelectrochemical (PEC) water splitting offers an eco-friendly method to convert solar energy into hydrogen, with recent advancements improving efficiency. However, despite direct hydrogen production on photocathode surfaces, research into high-performance, stable photocathode-specific catalysts remains limited. In this study, we optimized a NiMo hydrogen evolution reaction (HER) catalyst on Cu2O-based photocathodes using a photoelectrodeposition (PED) method to enhance PEC water-splitting efficiency. Key deposition parameters, including light, current density, applied voltage, and time, were systematically controlled to ensure uniform NiMo catalyst deposition without post-treatments. Under simulated 1-sun illumination, the optimized NiMo catalyst achieved 93% of the performance of conventional Pt catalysts and maintained stable hydrogen production for over 20 hours. Electrochemical analysis confirmed superior PEC performance of the NiMo catalyst, particularly at a fixed current density of −1.5 µA cm-2. This study introduces a noble metal-free catalyst deposition method, advancing solar-to-hydrogen conversion efficiency and long-term PEC device stability. - COLLAPSE
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    31 December 2024
  • A Study on the Contribution to Industrial Complex RE100 through Renewable Energy Electricity Storage and Sales: Focusing on Economic Analysis

    재생에너지전기저장판매사업을 통한 산업단지 RE100 기여에 관한 연구: 경제성 분석을 중심으로

    JungEun Kim, JongRoul Woo

    김정은, 우종률

    As companies increasingly join RE100 campaign to overcome the climate crisis, the importance of achieving RE100 in industrial complexes, which account for … + READ MORE
    As companies increasingly join RE100 campaign to overcome the climate crisis, the importance of achieving RE100 in industrial complexes, which account for over 70% of Korea’s manufacturing exports, is growing to maintain export competitiveness. This paper analyzed the economic feasibility of each participant in the renewable energy electricity storage and sales business that utilizes surplus power from solar power generation of a nearby school to achieve RE100 in industrial complexes. Results show that under current market conditions, it is challenging to ensure economic viability without reduced ESS installation costs or policy support. However, the introducing a real-time market, renewable energy bidding systems, and electricity prices linked to these systems showed potential for economic improvement. Therefore, institutional support is deemed necessary in the initial stages to promote the business. This approach is expected to contribute to enhancing social value by effectively utilize surplus power, contribute to achieving RE100, promote ESS deployment. - COLLAPSE
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    31 December 2024
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