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14. High‐Temperature Driven Recrystallization for Stable Dopant‐Free α‐FAPbI3 Perovskite Solar Cells.

Author

Xiao, Lingbo, Xu, Xiaoli, Zhao, Jie, Wang, Chen, Lu, Zheng, Li, Lutao, He, Liang, Chen, Yu, and Zou, Guifu

Subjects
RECRYSTALLIZATION (Metallurgy), DEIONIZATION of water, PEROVSKITE, HUMIDITY, HIGH temperatures
Abstract

High temperatures facilitate the formation of stable, high‐crystallinity α‐FAPbI3 films but can lead to the volatilization of organic components in perovskites. Here, a 300 °C hot‐press‐assisted recrystallization strategy is reported to grow stable phase‐pure α‐FAPbI3 film without any dopants. High temperature can promote the transformation of δ‐FAPbI3 to α‐FAPbI3, and induces recrystallization to relieve strain. The applied pressure creates a confined space that effectively prevents the volatilization of organic components in perovskite. The α‐FAPbI3 film prepared by hot‐press at 300 °C achieves an average grain size of ≈3 µm (with grains up to 10 µm) and demonstrates excellent damp‐heat stability, showing no significant change after 20 s in deionized water. The result solar cell delivers a power conversion efficiency as high as 24.06% and retains >70% of their initial efficiency value after 1000 h at 85 °C and 85% relative humidity. [ABSTRACT FROM AUTHOR]

Published
2024
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31. Neutral mononuclear copper(I) complexes: synthesis, crystal structures, and photophysical properties

Author

Sun, Yinghui, Lemaur, Vincent, Beltrán Fínez, Juan Ignacio, Cornil, Jérôme, Huang, Jianwen, Zhu, Juntong, Wang, Yun, Fröhlich, Roland, Wang, Haibo, Jiang, Lin, Zou, Guifu, Sun, Yinghui, Lemaur, Vincent, Beltrán Fínez, Juan Ignacio, Cornil, Jérôme, Huang, Jianwen, Zhu, Juntong, Wang, Yun, Fröhlich, Roland, Wang, Haibo, Jiang, Lin, and Zou, Guifu

Abstract

El texto completo de este trabajo no se encuentra disponible por no haber sido facilitado aún por su autor, por restricciones de copyright, o por no existir una versión digital, Neutral green-emitting four-coordinate Cu(I) complexes with general formula POPCu(NN), where POP = bis[2-(diphenylphosphino)phenyl]ether and NN = substituted 2-pyridine-1,2,4-triazole ligands, were synthesized. The crystal structures of (POPCuMeCN)+(PF6)− (1), POPCuPhPtp (2a, PhPtp = 2-(5-phenyl-2H-[1,2,4]triazol-3-yl)-pyridine), and POPCu(3,5-2FPhPtp) (2d, 3,5-2FPhPtp = 2-(5-(3,5-difluorophenyl)-2H-1,2,4-triazol-3-yl)pyridine) were determined by single-crystal X-ray diffraction analysis. The electronic and photophysical properties of the complexes were examined by UV–vis, steady-state, and time-resolved spectroscopy. At room temperature, weak emission was observed in solution, while in the solid state, all complexes exhibit intense green emission with quantum yield up to 0.54. The electronic and photophysical properties were further supported by calculation performed at the (time-dependent) density functional theory level. One of the complexes was also tested as dopant in electroluminescent devices., National Basic Research Program of China, National Natural Science Foundation of China (NSFC), Jiangsu Fund for Distinguished Young Scientist, Jiangsu Specially-Appointed Professor Program, Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), Jiangsu Scientist and Technological Innovation Team, Natural Science Foundation of Jiangsu Province, China Postdoctoral Science Foundation, Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP), Region Wallonne (OPTI2MAT excellence program), European Community, Depto. de Física de Materiales, Fac. de Ciencias Físicas, TRUE, pub

Published
2024

46. Monomolecular Membrane-Assisted Growth of Antimony Halide Perovskite/MoS2Van der Waals Epitaxial Heterojunctions with Long-Lived Interlayer Exciton

Author

Zhou, Zhicheng, Zhu, Juntong, Li, Lutao, Wang, Chen, Zhang, Changwen, Du, Xinyu, Wang, Xiangyi, Zhao, Guoxiang, Wang, Ruonan, Li, Jiating, Lu, Zheng, Zong, Yi, Sun, Yinghui, Rümmeli, Mark H., and Zou, Guifu

Abstract

Epitaxial growth stands as a key method for integrating semiconductors into heterostructures, offering a potent avenue to explore the electronic and optoelectronic characteristics of cutting-edge materials, such as transition metal dichalcogenide (TMD) and perovskites. Nevertheless, the layer-by-layer growth atop TMD materials confronts a substantial energy barrier, impeding the adsorption and nucleation of perovskite atoms on the 2D surface. Here, we epitaxially grown an inorganic lead-free perovskite on TMD and formed van der Waals (vdW) heterojunctions. Our work employs a monomolecular membrane-assisted growth strategy that reduces the contact angle and simultaneously diminishing the energy barrier for Cs3Sb2Br9surface nucleation. By controlling the nucleation temperature, we achieved a reduction in the thickness of the Cs3Sb2Br9epitaxial layer from 30 to approximately 4 nm. In the realm of inorganic lead-free perovskite and TMD heterojunctions, we observed long-lived interlayer exciton of 9.9 ns, approximately 36 times longer than the intralayer exciton lifetime, which benefited from the excellent interlayer coupling brought by direct epitaxial growth. Our research introduces a monomolecular membrane-assisted growth strategy that expands the diversity of materials attainable through vdW epitaxial growth, potentially contributing to future applications in optoelectronics involving heterojunctions.

Published
2024
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49. Hydroxide Modified Synthesis of Atomically‐Doped Photoluminescent WS2 Monolayers.

Author

Ouyang, Yuliang, Li, Wei, Zhang, Changwen, Wang, Xiangyi, Ma, Liang, Wang, Hao, Lin, He, Zou, Guifu, and Zhu, Juntong

Subjects
ELECTRON energy loss spectroscopy, MONOMOLECULAR films, SCANNING transmission electron microscopy, CHALCOGENS
Abstract

Atomically doping in thin film poses a significant challenge due to the potential for dopant precipitation caused by self‐purification effects. This challenge is particularly pronounced in the case of doping monolayers of photoluminescent transition metal dichalcogenides, where high energy barriers are also required to break the in‐plane bonds between the transition metal (TM) and chalcogen atoms. To address this issue, this study introduces hydroxide ions to adsorb onto the surface of WS2 monolayers. This results in a significant reduction in the formation energy of the TM─S bonds, enabling them to substitute for W sites and overcoming the self‐purification effect of WS2 monolayers. The in‐plane doping of TMs including Cr, Mn, Fe, Co, and Ni atoms is confirmed through precise atomic‐scale chemical imaging using scanning transmission electron microscopy with electron energy loss spectroscopy mapping. Photoluminescence measurements reveal that the band structure of WS2 monolayers can be systematically modulated by different doping metals, owing to their distinct atomic sizes. In addition, the atomically‐doped WS2 monolayers exhibit room‐temperature ferromagnetism, which has never been seen in pristine WS2 monolayers. The modulation of the band structure and the emergence of magnetism in TMs‐doped WS2 monolayers hold significant promise for optoelectronic and magnetoelectric applications. [ABSTRACT FROM AUTHOR]

Published
2024
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50. A Thermoresponsive Lead‐Free Organic‐Inorganic Hybrid Perovskite as a Dielectric Switch.

Author

Ou‐yang, Yuliang, Li, Lutao, Wang, Chen, Zou, Guifu, and Huang, Chao‐Ran

Subjects
PEROVSKITE, ENERGY consumption of buildings, SCIENTIFIC method, THERMORESPONSIVE polymers, DIELECTRIC materials, ELECTROCHROMIC windows, DIELECTRICS
Abstract

Thermochromic perovskites, renowned for their tunable bandgap, high absorption coefficient, and reversible color changes, emerge as promising candidates for applications in smart windows. These advancements not only have the potential to enhance occupant comfort but also contribute significantly to reducing energy consumption in buildings. Here, we present a two‐dimensional lead‐free organic‐inorganic hybrid perovskite [Cyclobutylammonium]2CuCl4 which shows phase transitions from C2/c to P21/c to P21/c space group at 319.5 K and 348.8 K, respectively. Accompanying these transitions is a fascinating, reversible thermochromic behavior that is dependent on the phase structure. This behavior manifests as a vibrant sequence transitioning from yellow to brown and finally to a slightly dark brown. Most importantly, the demonstrated ability to switch stably between high and low dielectric states indicates the enormous potential of this material as a dielectric switch. This non‐toxic thermoresponsive perovskite, characterized by its appropriate transition temperatures, reversible phase structure‐dependent thermochromism, and stable dielectric switching behavior, is expected to generate significant interest within the fields of thermoresponsive and dielectric switching materials. The integration of these features not only positions this perovskite as a noteworthy subject of scientific inquiry but also opens avenues for practical applications in diverse fields. [ABSTRACT FROM AUTHOR]

Published
2024
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