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Unraveling post-growth mechanisms of monolayer CsPbBr3 nanocubes:Laser-enhanced transformations and cathodoluminescence-electron microscopy correlations

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Journal of Energy Chemistry 2025年第01期 146-156页

作者： Mingxing Li Xiaoge Wang Xiaofan Cao zhiqun he Chunjun Liang Mingxing Chen Jing Ju Fangtian You Key Laboratory of Luminescence and Optical Information Ministry of Education Institute of Optoelectronic Technology Beijing Jiaotong University Beijing National Laboratory for Molecular Sciences (BNLMS) College of Chemistry and Molecular Engineering Peking University

Lead-halide perovskite nanoparticles（LHP NPs） are highly promising materials for next-generation displays and solid-state lighting due to their exceptional optical properties. However, their inherent instability presents a significant challenge. Recent advances have demonstrated that optoelectronic devices based on monolayer nanoparticle films exhibit both high luminescence efficiency and long-term *** research demonstrates that mobility limitations and anisotropic alignments in CsPbBr3nanocube monolayer films are key to their stabilization, hindering spontaneous growth through face-to-face fusion and resulting in the formation of connecting necks in a diagonal direction. Introducing laser irradiation confirmed this by significantly accelerating nanocubes growth, increasing mobility, and enhancing local structural ordering, leading to larger and more regularly shaped nanosheets. Fourier transform infrared spectroscopy and energy dispersive spectroscopy line-scan analyses indicated that laser irradiation did not disrupt the ligand structure. Transmission electron microscopy and correlative cathodoluminescence electron microscopy revealed the effects of post-growth and heterogeneous structures, including enhanced luminescence and inhomogeneous intensity in the nanosheets. These findings deepen the understanding of the post-growth mechanism of monolayer nanoparticles and the structure-emission correlation and highlight the unique role of laser irradiation in directing the formation of well-defined and regular nanostructures.

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Synthesis and light-emitting properties of 2-(N-phenyl-α-naphthylamino) and 2-dimesitylboron-7-(N-phenyl-α-naphthylamino)-9,9-diethylfluorene

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Science China Chemistry 2009年第7期52卷 952-960页

作者： ZHANG WenGuan he zhiqun HUI GuanBao MU LinPing WANG YongSheng ZHAO ShengMin JING XiPing Key Laboratory of Luminescence and Optical Information Ministry of EducationInstitute of Optoelectronic TechnologyBeijing Jiaotong UniversityBeijing 100044China Laboratory of Printing and Packaging Material and Technology and Beijing Area Major Laboratory Beijing Institute of Graphic CommunicationBeijing 102600China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

A fluorescent organic triarylamine with a symmetric structure, 2,7-bis(N-α-naphthyl-phenylamino)-9,9- diethylfluorene (NPAEF) was synthesized using two methods, modified Ullmann coupling and modified palladium-catalyzed amination. An activated copper and a combination of Pd(OAc)2/P(t-Bu)3 and Pd(dba)2/P(t-Bu)3 were selected as catalysts to improve yields of reactions. These synthetic procedures were also successfully applied to an asymmetric 2-dimesitylboron-7-(N-phenyl-α-naphthylamino)-9,9-diethylfluorene (BNPEF). Photoluminescent emission peaks in solid film and in diluted solution of NPAEF were both observed at 461 nm, while the main emission peaks of BNPEF appeared at 422 nm in hexane, and at 480 nm in methanol. The double emission peaks of BNPEF in hexane reflected fine structure in the vibrational state. With an increasing polarity of solvent, the main PL emission peaks were red-shifted and vibrational fine structure disappeared. Additionally, energy levels of NPAEF were investigated and an electroluminescence (EL) device of ITO/PVK:NPAEF/Al was fabricated, which showed a turn-on voltage of 9 V and peaked at 462 nm. The EL spectrum was in good agreement with PL spectrum, which indicated that they were from the same emitting center in the device.

关键词： catalysis fluorene dimesitylboron triarylamine light-emitting

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Anomalously large interface charge in polarity–switchable photovoltaic devices:an indication of mobile ions in organic–inorganic halide perovskites

Anomalously large interface charge in polarity–switchable p...

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第二届新型太阳能电池学术研讨会

作者： Yong Zhao Chunjun Liang zhiqun he Key Laboratory of Luminescence and Optical Information Ministry of EducationInstitute of Optoelectronics Beijing Jiaotong University

The development of organic–inorganic halide perovskite solar cells(PSCs) has been very fast, recently. PSCs display diversified device architectures and anomalous current–voltage hysteresis. These features imply that the organic–inorganic halide perovskites possess some unique properties. here we report an polarity-switchable photovoltaic device in the structure of ITO/PEDOT:PSS/CHNHPbI/MoO/Al. The polarity of the device is switchable with a preset voltage. An unusually large quantity of interface charge is observed. The accumulation of the interface charge converts the device from a hole-only device to a functional photovoltaic device in a time scale of 0 s. The interface charge has been proved to mainly originate from mobile ions in the hybrid perovskite. The discovery of the interface charge reveals a unique device mechanism in perovskite photovoltaics. The interface charge changes the band bending near the interface and thus leads to a wide range of device architectures, current–voltage hysteresis, and polarity switch. The results suggest that manipulating the interface charge is key to controlling the performance of PSCs. The discovery of the mobile ions indicates an unexpected, unique property of the hybrid perovskites. Future studies should investigate the origin and the related effects of the mobile ions.[1]

关键词：钙钛矿太阳能电池界面电荷极性可变的光伏器件

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Organic-inorganic perovskite light-emitting electrochemical cells with a large capacitance

Organic-inorganic perovskite light-emitting electrochemical ...

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第四届新型太阳能电池学术研讨会

作者： Huimin Zhang Chunjun Liang zhiqun he Key Laboratory of Luminescence and Optical Information Ministry of EducationInstitute of Optoelectronics Beijing Jiaotong University

While perovskite light-emitting diodes typically made from high work function anode and low work function cathode have recently gained intense interests, we demonstrate perovskite light-emitting devices from two high work function electrodes with interesting ***, electroluminescence can be easily obtained from both forward and reverse ***, the results of impedance spectroscopy indicate that the ionic conductivity in the iodide perovskite(CHNHPbI) is large with a value of ***, the shift of the emission spectrum in the mixed halide perovskite(CHNHPbIBr) lightemitting devices indicates that I-ions are mobile in the ***, our work shows that the accumulated ions at the interfaces results in a large capacitance(00 μFcm).The above results conclusively prove that the organic–inorganic halide perovskites are solid electrolytes with mixed ionic and electronic conductivity and the light-emitting device is a light-emitting electrochemical *** work also suggests that the organic-inorganic halide perovskites are potential energy-storage materials, which may be applicable in the field of solid-state super capacitors and batteries.[1] [2]

关键词：钙钛矿发光电化学池界面电荷

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Exploring alkylthiol additives in PBDB-T:ITIC blended active layers for solar cell applications

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Chinese Physics B 2019年第8期28卷 425-432页

作者： Xiang Li zhiqun he Mengjie Sun Huimin Zhang Zebang Guo Yajun Xu Han Li Chunjun Liang Xiping Jing Key Laboratory of Luminescence and Optical Information Ministry of EducationInstitute of Optoelectronic TechnologyBeijing Jiaotong UniversityBeijing 100044China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

Bulk heterojunction,non-fullerene PBDB-T:ITIC blend polymer solar cells have been *** active layers consisting of PBDB-T as a donor and ITIC as an acceptor are optimized using a series of alkylthiol additives(1,3-propanedithiol,1,4-butanedithiol,and 1,8-octanedithiol).It is found that the donor and acceptor are phase separated with different crystalline *** additives effectively re-organize the morphology and extend the molecule ordering in lamellar structure with increased correlation length in ITIC domain,benefiting the generation and dissociation of exciton and reducing charge recombination.A substantial improvement in power conversion efficiency of the devices from 8.13%to 9.44%is *** study shows that the application of alkylthiol additives is a simple and effective approach to improve the device performance in solar cells based on polymer/non-fullerene blend system.

关键词： bulk heterojunction(BHJ)polymer/non-fullerene solar cells solvent additive morphology crystallization

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