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462 results on '"Lee, Jaehwi"'

1. De-doping engineering for efficient and heat-stable perovskite solar cells

Author

Shin, Yun Seop, Song, Ji Won, Lee, Dong Gyu, Lee, Jaehwi, Seo, Jongdeuk, Roe, Jina, Shin, Gwang Yong, Kim, Dongshin, Yeop, Jiwoo, Lee, Dongmin, Kim, Minjin, Jo, Yimhyun, Jang, Hyungsu, Son, Jung Geon, Lee, Woojin, Son, Jeongmin, Park, Sujung, Cho, Shinuk, Shin, Tae Joo, Kim, Gi-Hwan, Kim, Jin Young, Lee, Tae Kyung, Grätzel, Michael, and Kim, Dong Suk

Published
2025
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3. Post‐Treated Polycrystalline SnO2 in Perovskite Solar Cells for High Efficiency and Quasi‐Steady‐State‐IV Stability.

Author

Song, Ji Won, Shin, Yun Seop, Kim, Minjin, Lee, Jaehwi, Lee, Dongmin, Seo, Jongdeuk, Lee, YeonJeong, Lee, Woosuk, Kim, Hak‐Beom, Mo, Sung‐In, An, Jeong‐Ho, Hong, Ji‐Eun, Kim, Jin Young, Jeon, Il, Jo, Yimhyun, and Kim, Dong Suk

Subjects
CHEMICAL solution deposition, SOLAR cell efficiency, STANNIC oxide, TIN oxides, TIN chlorides
Abstract

The prominent chemical bath deposition (CBD) method leverages tin dioxide (SnO2) as an electron transport layer (ETL) in perovskite solar cells (PSCs), achieving exceptional efficiency. The deposition of SnO2, however, can lead to the formation of oxygen vacancies and surface defects, which subsequently contribute to performance challenges such as hysteresis and instability under light‐soaking conditions. To alleviate these issues, it is crucial to address heterointerface defects and ensure the uniform coverage of SnO2 on fluorine‐doped tin oxide substrates. Herein, the efficacy of tin(IV) chloride (SnCl4) post‐treatment in enhancing the properties of the SnO2‐ETL and the performances of PSCs are presented. The treatment with SnCl4 not only removes undesired agglomerated SnO2 nanoparticles from the surface of CBD SnO2 but also improves its crystallinity through a recrystallization process. This leads to an optimized interface between the SnO2‐ETL and perovskite, effectively minimizing defects while promoting efficient electron transport. The resultant PSCs demonstrate improved performance, achieving an efficiency of 25.56% (certified with 24.92%), while retaining 95.84% of the initial PCE under ambient storage conditions. Additionally, PSCs treated with SnCl4 endure prolonged light‐soaking tests, particularly when subjected to quasi‐steady‐state‐IV measurements. This highlights the potential of SnCl4 treatment as a promising strategy for advancing PSC technology. [ABSTRACT FROM AUTHOR]

Published
2024
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16. Zn2+ ion doping for structural modulation of lead-free Sn-based perovskite solar cells.

Author

Jang, Hyungsu, Lim, Hyeong Yong, Park, Chan Beom, Seo, Jongdeuk, Son, Jung Geon, Song, Taehee, Lee, Jaehwi, Shin, Yun Seop, Roe, Jina, Kwak, Sang Kyu, Kim, Dong Suk, and Kim, Jin Young

Abstract

Sn-based perovskites have intrinsic defects, such as Sn vacancies, oxidised components (Sn4+), and local lattice strain in the perovskite crystalline structure. In this study, Zn metal powder (Zn0) was introduced to reduce Sn oxidation in the solution step based on the redox potential difference. Additionally, Zn2+ was introduced in the perovskite precursor, which decreased the intrinsic defects and lattice strain of the perovskite films. The diffusion length, particularly that of the hole, increased with a reduction in the lattice strain, and Zn doping led to interfacial energy-level alignment of the perovskite and hole-transporting layers. The reduced lattice strain decreased the defect density and charge carrier recombination of perovskite devices. The power conversion efficiency of the Zn-doped Sn-based perovskite solar cell was improved to 11.39% compared to the 8.56% of the reference device. [ABSTRACT FROM AUTHOR]

Published
2023
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