• Conjugated Oligoelectrolyte Ligands for CsPbBr3 Nanocrystals: Impact of Ionic Density on Förster Energy Transfer
    Jung Min Ha, Nayoung Kim, Ha Yeon Kim, Sungnam Park, Han Young Woo
    Replacing insulating aliphatic ligands with conjugated oligoelectrolytes (COEs) enables strong binding, effective passivation, and Förster resonance energy transfer (FRET) to amplify the … + READ MORE
    Replacing insulating aliphatic ligands with conjugated oligoelectrolytes (COEs) enables strong binding, effective passivation, and Förster resonance energy transfer (FRET) to amplify the fluorescence of CsPbBr3 perovskite nanocrystals (PNCs). Herein, we report multifunctional COEs with systematically varied ionic densities (2, 4, and 6 quaternary ammonium bromides) as surface ligands for CsPbBr3 PNCs. Increasing ionic density enhances binding intimacy with the PNC surface, leading to photoluminescence quantum yield (PLQY) over 94% with more efficient FRET efficiency. Time-resolved photoluminescence reveals FRET efficiencies of 40%, 63%, and 84% for QTF2Br, QTF4Br, and QTF6Br-capped PNCs, respectively. While higher ionic densities achieve superior FRET performance, they compromise colloidal dispersibility due to increased surface polarity. The study provides molecular-level insights into how ionic density modulates interfacial coupling and affects the luminescent property of PNCs, offering design principles of semiconducting ligands and unleash their potential for their optoelectronic applications. - COLLAPSE
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    31 March 2026
  • Ligand Engineering in Perovskite Quantum Dot Solar Cells: Impact of A-Site Cation Composition

    페로브스카이트 양자점 태양전지의 A-site 양이온 조성에 따른 리간드 제어 공정 특성 변화

    Sang-Hak Lee, Sung-Yeon Jang

    이상학, 장성연

    Perovskite quantum dots (PQDs) have attracted significant attention as promising photovoltaic materials due to their unique optoelectronic properties, defect tolerance, and facile … + READ MORE
    Perovskite quantum dots (PQDs) have attracted significant attention as promising photovoltaic materials due to their unique optoelectronic properties, defect tolerance, and facile solution processing. Since the first report of PQD solar cells in 2016 with 10.77% efficiency, rapid development has been achieved, with recent certified values exceeding 19%. A key factor in this development is the control of initial long-chain ligands that must be replaced or removed to enable efficient charge transport. Because ligand binding strength and exchange behavior differ depending on the A-site cation, tailored strategies have been developed for inorganic Cs-based, organic FA/MA-based, and mixed cation PQDs. These efforts have led to steady improvements in device efficiency and stability. This review highlights recent advances in ligand engineering with respect to A-site composition and discusses remaining challenges for high-performance, scalable PQD solar cells. - COLLAPSE
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    31 March 2026
  • Perovskite Solar Cells Based on Carbon Nanotube Electrodes Infiltrated with Hole Transport Materials

    정공수송물질이 침투된 탄소 나노 튜브 전극 기반 페로브스카이트 태양전지

    Eun Chong Chae, Do-Ha Kim, Jae Young Park, Hee Jeong Jeong, Kyung Mun Yeom, Yeonsu Jung, Jinho Jang, Sang Woon Na, Sang Hyuk Im, Bong Joo Kang, Soonil Hong, Nam Joong Jeon

    채은총, 김도하, 박재용, 정희정, 염경문, 정연수, 장진호, 나상운, 임상혁, 강봉주, 홍순일, 전남중

    Traditionally, expensive metals like gold or silver have been used as the rear electrode for perovskite solar cells (PSCs), which have highly … + READ MORE
    Traditionally, expensive metals like gold or silver have been used as the rear electrode for perovskite solar cells (PSCs), which have highly efficient performance. Within this framework, carbon nanotube (CNT) electrodes have been regarded as promising low cost electrodes due to their mechanical strength and excellent electrical conductivity. In spite of these advantages, concerns have arisen about the power conversion efficiency (PCE) and stability of PSCs based on CNTs due to the porosity of CNT electrodes and interfacial issue. In this work, we introduced PM6 hole transport material infiltration method to address issues related to the porosity of carbon nanotube (CNT) electrodes, aiming to improve the performances. As a result, the infiltration of PM6 into the CNT electrode improved the interfacial contact between the CNT electrode and the perovskite layer, thereby the best PCE of 15.49% was achieved in PSCs based on CNT rear electrodes. - COLLAPSE
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    31 March 2026
  • Metal Halide Templating Layers for Inverted Wide-Bandgap Perovskite Solar Cells via Dry Vacuum Sublimation

    건식 진공 승화법을 이용한 역구조 와이드 밴드갭 페로브스카이트 태양전지용 금속 할로겐 탬플릿 층

    Jong Hun Yeo, Seung-Woo Kim, Su Ji Moon, Nam Joong Jeon, Beom Soo Kim

    여종훈, 김승우, 문수지, 전남중, 김범수

    The impact of bottom-layer selection on the structual, optical, and photovoltaic properties of vacuum-deposited perovskite films was systematically investigated. Atomic force microscopy … + READ MORE
    The impact of bottom-layer selection on the structual, optical, and photovoltaic properties of vacuum-deposited perovskite films was systematically investigated. Atomic force microscopy (AFM) revealed that films grown on CsI exhibited the lowest root-mean-square(RMS) roughness (16.2 nm) and densely packed, large grains, indicating reduced defect density and suppressed non-radiative recombination, X-ray diffraction (XRD) and UV-Vis spectroscopy showed that CsI effectively showed the alpha-phase while suppressing the delta-phase, resulting in improved crystallinity and enhanced light absorption. Photoluminescence(PL) measurements demonstrated minimal peak shift(25.7 nm) over 15 minutes for CsI-based films, confirming superior phase stability compared to other bottom-layers. Consequently, perovskite solar cells incorporating CsI exhibited enhanced open-circuit voltage(VOC), short-circuit current density(JSC), and fill factor(FF), maintaining 101.1% of the initial efficiency and 99.2% of the maximum efficiency over 12 hours of maximum power point(MPP) tracking under 25℃ and 40% relative humidity without encapsulation. These findings highlight that bottom-layer engineering critically influences perovskite crystal growth, phase stability, and device performance. CsI, in particular, provides a combination of alpha-phase stabilization, high optical absorption, and superior film quality, making it an optimal bottom-layer for high-efficiency and long term stable perovkite solar cells. - COLLAPSE
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    31 March 2026
  • Analysis of the surface passivation characteristics of crystalline silicon solar cells following subsequent heat treatment of Al2O3 thin films

    Al2O3 박막의 후속 열처리에 따른 결정질 실리콘 태양전지 표면 패시베이션 특성 분석

    Munse Kim, Yunae Cho, Yong-Jin Kim, Unsoo Kim, Hyungwoo Kim, Kyung Taek Jeong, Hae-Seok Lee, Chelwook Kwon, Kyuhyeon Im, Minseo Kim, Hee-eun Song, Sang Hee Lee

    김문세, 조윤애, 김용진, 김언수, 김형우, 정경택, 이해석, 권철욱, 임규현, 김민서, 송희은, 이상희

    Effective surface passivation is essential for high-efficiency crystalline silicon (c-Si) solar cells. Aluminum oxide (Al2O3) films deposited via … + READ MORE
    Effective surface passivation is essential for high-efficiency crystalline silicon (c-Si) solar cells. Aluminum oxide (Al2O3) films deposited via atomic layer deposition (ALD) are a leading passivation material due to their high negative fixed charge density (Qf) and low interface trap density (Dit). However, the optimal passivation performance is highly dependent on the post-deposition annealing (PDA) temperature, a relationship that is often reported inconsistently in the literature. This study systematically investigates the integrated passivation mechanism of an ~10 nm amorphous AlOx film on c-Si. By precisely controlling the PDA temperature, we employ combined electrical, chemical, and optoelectronic analyses to link process condition to passivation performance. Our findings reveal that both the magnitude of negative Qf and the overall passivation quality are maximized at a PDA temperature of approximately 450°C. Fourier-transform infrared (FT-IR) spectroscopy confirms that this optimal performance correlates with densification and rearrangement of the Al-O network, which stabilizes negative charge centers near the interface. At higher temperatures (≥ 500°C), a clear decline in passivation is observed, which we attribute to the growth of an interfacial SiO2 layer and hydrogen loss. This study establishes a direct link between PDA temperature, structural changes, and passivation performance, providing quantitative, physically grounded guidelines for optimizing Al2O3-based passivation in high-efficiency c-Si solar cells. - COLLAPSE
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    31 March 2026
  • Development of a YOLO-Based Deep Learning Algorithm For High-Precision Small Object Detection in Real-Time Hot Spot Analysis of Solar Panels

    실시간 태양광 패널 핫스팟 분석을 위한 고정밀 소형 객체 탐지용 YOLO 기반의 딥러닝 알고리즘 개발

    Seungho Woo, Changjo Kim, Byeongsu Kim

    우승호, 김창조, 김병수

    With the expansion of solar energy as a leading renewable energy source due to its sustainability, ease of installation, and long operational … + READ MORE
    With the expansion of solar energy as a leading renewable energy source due to its sustainability, ease of installation, and long operational lifetime, autonomous photovoltaic operation and maintenance (O&M) systems are increasingly important. Here, we present a YOLO_v11n-based deep learning model specializing in precise detection of hot spots on solar panels. We analyze the impact of augmentation hyperparameters (mixup, mosaic, copy_paste and close_mosaic) on small object detection. Our observations exhibit that a mixup value of 0.2 improves mAP@50, which represents the average accuracy, by over 3.7%, while excessive mixup increases image transparency, relaxing boundaries between small objects and reducing accuracy. Copy_paste has minimal effect when sufficient training data is available. Properly balancing the use of original and mosaic images, which combine four images into one, is crucial for high accuracy, and setting close_mosaic at 10% of entire training progress optimizes performance. Consequently, our model achieves over 95% of outstanding mAP@50, demonstrating robust and high-precision hot spot detection. - COLLAPSE
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    31 March 2026
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