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259 results on '"Jeong, Inyoung"'

2. ABCA7-dependent induction of neuropeptide Y is required for synaptic resilience in Alzheimer’s disease through BDNF/NGFR signaling

Author

Tayran, Hüseyin, Yilmaz, Elanur, Bhattarai, Prabesh, Min, Yuhao, Wang, Xue, Ma, Yiyi, Wang, Ni, Jeong, Inyoung, Nelson, Nastasia, Kassara, Nada, Cosacak, Mehmet Ilyas, Dogru, Ruya Merve, Reyes-Dumeyer, Dolly, Stenersen, Jakob Mørkved, Reddy, Joseph S., Qiao, Min, Flaherty, Delaney, Gunasekaran, Tamil Iniyan, Yang, Zikun, Jurisch-Yaksi, Nathalie, Teich, Andrew F., Kanekiyo, Takahisa, Tosto, Giuseppe, Vardarajan, Badri N., İş, Özkan, Ertekin-Taner, Nilüfer, Mayeux, Richard, and Kizil, Caghan

Published
2024
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6. Flexible and lightweight perovskite/Cu(In,Ga)Se2 tandem solar cells

Author

Jeong, Inyoung, Lee, Tae Kyung, Van Tran, Hung, Hwang, Inchan, Hwang, Jiseon, Lee, Ahreum, Ham, Seungsik, Tran, Huyen, Cho, Yunae, Shin, Donghyeop, Song, Soomin, Lee, Sangmin, Ahn, Seung Kyu, Eo, Young-Joo, Cho, Ara, Park, Joo Hyung, Cho, Jun-Sik, Byeon, Junseop, Kim, Won Mok, Yun, Jae Ho, Gwak, Jihye, Hong, Sungjun, Ahn, SeJin, Kim, Hae-Jin, and Kim, Kihwan

Published
2024
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11. Enhancement of Cd‐Free All‐Dry‐Processed Cu(In1‐x,Gax)Se2 Thin‐Film Solar Cells by Simultaneous Adoption of an Enlarged Bandgap Absorber and Tunable Bandgap Zn1‐xMgxO Buffer

Author

Park, Joo Hyung, Jo, Yonghee, Cho, Ara, Jeong, Inyoung, An, Jin Gi, Kim, Kihwan, Ahn, Seung Kyu, Shin, Donghyeop, and Cho, Jun‐Sik

Subjects
ATOMIC layer deposition, SOLAR cells, CONDUCTION bands, ATOMIC structure, MASS production
Abstract

Attempts to remove environmentally harmful materials in mass production industries are always a major issue and draw attention if the substitution guarantees a chance to lower fabrication cost and to improve device performance, as in a wide bandgap Zn1‐xMgxO (ZMO) to replace the CdS buffer in Cu(In1‐x,Gax)Se2 (CIGSe) thin‐film solar cell structure. ZMO is one of the candidates for the buffer material in CIGSe thin‐film solar cells with a wide and controllable bandgap depending on the Mg content, which can be helpful in attaining a suitable conduction band offset. Hence, compared to the fixed and limited bandgap of a CdS buffer, a ZMO buffer may provide advantages in Voc and Jsc based on its controllable and wide bandgap, even with a relatively wider bandgap CIGSe thin‐film solar cell. In addition, to solve problems with the defect sites at the ZMO/CIGSe junction interface, a few‐nanometer ZnS layer is employed for heterojunction interface passivation, forming a ZMO/ZnS buffer structure by atomic layer deposition (ALD). Finally, a Cd‐free all‐dry‐processed CIGSe solar cell with a wider bandgap (1.25 eV) and ALD‐grown buffer structure exhibited the best power conversion efficiency of 19.1%, which exhibited a higher performance than the CdS counterpart. [ABSTRACT FROM AUTHOR]

Published
2025
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20. Interplay between strain and charge in Cu(In,Ga)Se2 flexible photovoltaics.

Author

Park, Ha Kyung, Yim, Kanghoon, Lee, Jiyoon, Cho, Yunae, Jeong, Inyoung, Shin, Donghyeop, Gwak, Jihye, Walsh, Aron, Kim, Kihwan, and Jo, William

Subjects
STRAINS & stresses (Mechanics), ENERGY levels (Quantum mechanics), SOLAR cells, COPPER, CHARGE carriers
Abstract

Flexible and lightweight Cu(In,Ga)Se2 (CIGS) thin-film solar cells are promising for versatile applications, but there is limited understanding of stress-induced changes. In this study, the charge carrier generation and trapping behavior under mechanical stress was investigated using flexible CIGS thin-film solar cells with various alkali treatments. Surface current at the CIGS surface decreased by convex bending, which occurs less with the incorporation of alkali metals. The formation energy of the carrier generating defects increased in convex bending environments clarifying the degradation of the surface current. Moreover, alkali-related defects had lower formation energy than the intrinsic acceptors, mitigating current degradation in mechanical stress condition. The altered defect energy levels were attributed to the deformation of the crystal structure under bending states. This study provides insights into the mitigating of strain-induced charge degradation for enhancing the performance and robustness of flexible CIGS photovoltaic devices. [ABSTRACT FROM AUTHOR]

Published
2024
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21. Efficient and stable CsPbI3 perovskite solar cells with spontaneously formed 2D-Cs2PbI2Cl2 at the buried interface

Author

Shah, Syed-Fawad-Ali, primary, Jeong, Inyoung, additional, Park, Jaewang, additional, Shin, Donghyeop, additional, Hwang, Inchan, additional, Tsvetkov, Nikolai, additional, Kim, Dohyung, additional, Gwak, Jihye, additional, Park, Joo Hyung, additional, Seok, Sang Il, additional, Kim, Kihwan, additional, and Min, Hanul, additional

Published
2024
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22. Machine Learning Aided Optimization of P1 Laser Scribing Process on Indium Tin Oxide Substrates

Author

Karade, Vijay C., primary, Kim, Saewoong, additional, Jeong, Inyoung, additional, Ko, Min Jae, additional, Park, Joo Hyung, additional, Cho, Jun‐Sik, additional, Hwang, Inchan, additional, Gwak, Jihye, additional, Sutar, Santosh S., additional, Dongale, Tukaram D., additional, Yun, Jae Ho, additional, Kim, Kihwan, additional, and Eo, Young‐Joo, additional

Published
2024
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23. Application of Bifacial Semitransparent CuInSe2 Absorber to the Bottom Cell in Bifacial Semitransparent Perovskite/CuInSe2 Tandem Solar Cell for Albedo Environment (Small 9/2024)

Author

An, Jin Gi, primary, Tran, Huyen, additional, Kim, Dongryeol, additional, Lee, Sang Min, additional, Lee, Ahreum, additional, Ahn, Seung Kyu, additional, Cho, Jun‐Sik, additional, Gwak, Jihye, additional, Kim, TaeWan, additional, Jeong, Inyoung, additional, and Park, Joo Hyung, additional

Published
2024
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33. Mitigating Intrinsic Interfacial Degradation in Semi‐Transparent Perovskite Solar Cells for High Efficiency and Long‐Term Stability (Adv. Energy Mater. 47/2023)

Author

Naqvi, Syed Dildar Haider, primary, Son, Kyungnan, additional, Jung, Wonzee, additional, Hwang, Hui ung, additional, Lee, Sangmin, additional, Lee, Arheum, additional, Keum, Minjong, additional, Kim, Sunwook, additional, Kim, Jeong Won, additional, Kang, Min Gu, additional, Song, Hee‐eun, additional, Hong, Sungjun, additional, Jeong, Inyoung, additional, Ahn, Seungkyu, additional, Lambertz, Andreas, additional, Ding, Kaining, additional, Duan, Weiyuan, additional, Yim, Kanghoon, additional, and Ahn, SeJin, additional

Published
2023
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38. Scalable CIGS Solar Cells Employing a New Device Design of Nontoxic Buffer Layer and Microgrid Electrode

Author

Hwang, Inchan, Lee, Myounghyun, Lee, Ahreum, Jeong, Inyoung, Song, Soomin, Shin, Donghyeop, Park, Joohyung, Cho, Ara, Eo, Young-Joo, Yoo, Jin-Su, Ahn, Seung Kyu, Gwak, Jihye, Ahn, Sejin, Seo, Kwanyong, and Kim, Kihwan

Abstract

The efficiency of copper indium gallium selenide (CIGS) solar cells that use transparent conductive oxide (TCO) as the top electrode decreases significantly as the device area increases owing to the poor electrical properties of TCO. Therefore, high-efficiency, large-area CIGS solar cells require the development of a novel top electrode with high transmittance and conductivity. In this study, a microgrid/TCO hybrid electrode is designed to minimize the optical and resistive losses that may occur in the top electrode of a CIGS solar cell. In addition, the buffer layer of the CIGS solar cells is changed from the conventional CdS buffer to a dry-processed wide-band gap ZnMgO (ZMO) buffer, resulting in increased device efficiency by minimizing parasitic absorption in the short-wavelength region. By optimizing the combination of ZMO buffer and the microgrid/TCO hybrid electrode, a device efficiency of up to 20.5% (with antireflection layers) is achieved over a small device area of 5 mm × 5 mm (total area). Moreover, CIGS solar cells with an increased device area of up to 20 mm × 70 mm (total area) exhibit an efficiency of up to 19.7% (with antireflection layers) when a microgrid/TCO hybrid electrode is applied. Thus, this study demonstrates the potential for high-efficiency, large-area CIGS solar cells with novel microgrid electrodes.

Published
2024
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40. Defect Engineering in Earth‐Abundant Cu2ZnSnSe4 Absorber Using Efficient Alkali Doping for Flexible and Tandem Solar Cell Applications.

Author

Rehan, Muhammad, Cho, Ara, Jeong, Inyoung, Kim, Kihwan, Ullah, Asmat, Cho, Jun‐Sik, Park, Joo Hyung, Jo, Yunae, Hong, Sung Jun, Ahn, Seung Kyu, Ahn, SeJin, Yun, Jae Ho, Gwak, Jihye, and Shin, Donghyeop

Subjects
SOLAR cells, ALKALIES, CERAMICS, ENGINEERING, ANTHOLOGY films
Abstract

To demonstrate flexible and tandem device applications, a low‐temperature Cu2ZnSnSe4 (CZTSe) deposition process, combined with efficient alkali doping, was developed. First, high‐quality CZTSe films were grown at 480 °C by a single co‐evaporation, which is applicable to polyimide (PI) substrate. Because of the alkali‐free substrate, Na and K alkali doping were systematically studied and optimized to precisely control the alkali distribution in CZTSe. The bulk defect density was significantly reduced by suppression of deep acceptor states after the (NaF + KF) PDTs. Through the low‐temperature deposition with (NaF + KF) PDTs, the CZTSe device on glass yields the best efficiency of 8.1% with an improved VOC deficit of 646 mV. The developed deposition technologies have been applied to PI. For the first time, we report the highest efficiency of 6.92% for flexible CZTSe solar cells on PI. Additionally, CZTSe devices were utilized as bottom cells to fabricate four‐terminal CZTSe/perovskite tandem cells because of a low bandgap of CZTSe (~1.0 eV) so that the tandem cell yielded an efficiency of 20%. The obtained results show that CZTSe solar cells prepared by a low‐temperature process with in‐situ alkali doping can be utilized for flexible thin‐film solar cells as well as tandem device applications. [ABSTRACT FROM AUTHOR]

Published
2024
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41. Foxj1 controls olfactory ciliogenesis and differentiation program of the olfactory sensory neurons

Author

Rayamajhi, Dheeraj, primary, Ege, Mert, additional, Ukhanov, Kirill, additional, Ringers, Christa, additional, Zhang, Yiliu, additional, Jeong, Inyoung, additional, D'Gama, Percival P, additional, Li, Summer Shijia, additional, Cosacak, Mehmet Ilyas, additional, Kizil, Caghan, additional, Park, Hae-Chul, additional, Yaksi, Emre, additional, Martens, Jeffrey R, additional, Brody, Steven L, additional, Jurisch-Yaksi, Nathalie, additional, and Roy, Sudipto, additional

Published
2023
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46. Novel analytical tools reveal that local synchronization of cilia coincides with tissue-scale metachronal waves in zebrafish multiciliated epithelia

Author

Ringers, Christa, Bialonski, Stephan, Ege, Mert, Solovev, Anton, Hansen, Jan Niklas, Jeong, Inyoung, Friedrich, Benjamin M., Jurisch-Yaksi, Nathalie, Goldstein, Raymond E., Ringers, Christa, Bialonski, Stephan, Ege, Mert, Solovev, Anton, Hansen, Jan Niklas, Jeong, Inyoung, Friedrich, Benjamin M., Jurisch-Yaksi, Nathalie, and Goldstein, Raymond E.

Abstract

Motile cilia are hair-like cell extensions that beat periodically to generate fluid flow along various epithelial tissues within the body. In dense multiciliated carpets, cilia were shown to exhibit a remarkable coordination of their beat in the form of traveling metachronal waves, a phenomenon which supposedly enhances fluid transport. Yet, how cilia coordinate their regular beat in multiciliated epithelia to move fluids remains insufficiently understood, particularly due to lack of rigorous quantification. We combine experiments, novel analysis tools, and theory to address this knowledge gap. To investigate collective dynamics of cilia, we studied zebrafish multiciliated epithelia in the nose and the brain. We focused mainly on the zebrafish nose, due to its conserved properties with other ciliated tissues and its superior accessibility for non-invasive imaging. We revealed that cilia are synchronized only locally and that the size of local synchronization domains increases with the viscosity of the surrounding medium. Even though synchronization is local only, we observed global patterns of traveling metachronal waves across the zebrafish multiciliated epithelium. Intriguingly, these global wave direction patterns are conserved across individual fish, but different for left and right noses, unveiling a chiral asymmetry of metachronal coordination. To understand the implications of synchronization for fluid pumping, we used a computational model of a regular array of cilia. We found that local metachronal synchronization prevents steric collisions, i.e., cilia colliding with each other, and improves fluid pumping in dense cilia carpets, but hardly affects the direction of fluid flow. In conclusion, we show that local synchronization together with tissue-scale cilia alignment coincide and generate metachronal wave patterns in multiciliated epithelia, which enhance their physiological function of fluid pumping.

Published
2023
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47. Effects of the Electrical Properties of SnO 2 and C60 on the Carrier Transport Characteristics of p-i-n-Structured Semitransparent Perovskite Solar Cells.

Author

Pham, Hoang Minh, Naqvi, Syed Dildar Haider, Tran, Huyen, Tran, Hung Van, Delda, Jonabelle, Hong, Sungjun, Jeong, Inyoung, Gwak, Jihye, and Ahn, SeJin

Subjects
STANNIC oxide, SOLAR cells, PHOTOVOLTAIC power systems, PEROVSKITE, ELECTRON transport, BUFFER layers, CONDUCTION bands
Abstract

Recently, metal halide perovskite-based top cells have shown significant potential for use in inexpensive and high-performance tandem solar cells. In state-of-the-art p-i-n perovskite/Si tandem devices, atomic-layer-deposited SnO2 has been widely used as a buffer layer in the top cells because it enables conformal, pinhole-free, and highly transparent buffer layer formation. In this work, the effects of various electrical properties of SnO2 and C60 layers on the carrier transport characteristics and the performance of the final devices were investigated using a numerical simulation method, which was established based on real experimental data to increase the validity of the model. It was found that the band alignment at the SnO2/C60 interface does, indeed, have a significant impact on the electron transport. In addition, as a general design rule, it was suggested that at first, the conduction band offset (CBO) between C60 and SnO2 should be chosen so as not to be too negative. However, even in a case in which this CBO condition is not met, we would still have the means to improve the electron transport characteristics by increasing the doping density of at least one of the two layers of C60 and/or SnO2, which would enhance the built-in potential across the perovskite layer and the electron extraction at the C60/SnO2 interface. [ABSTRACT FROM AUTHOR]

Published
2023
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48. Defect Engineering in Earth‐abundantCu 2 ZnSnSe 4Absorber Using Efficient Alkali Doping for Flexible and Tandem Solar Cell Applications

Author

Rehan, Muhammad, primary, Cho, Ara, additional, Jeong, Inyoung, additional, Kim, Kihwan, additional, Ullah, Asmat, additional, Cho, Jun‐Sik, additional, Park, Joo Hyung, additional, Jo, Yunae, additional, Hong, Sung Jun, additional, Ahn, Seung Kyu, additional, Ahn, SeJin, additional, Yun, Jae Ho, additional, Gwak, Jihye, additional, and Shin, Donghyeop, additional

Published
2023
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