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Single-crystal perovskite for highly efficient and stable light-emitting diodes

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Science China Chemistry 2023年第8期66卷 2166-2168页

作者： Kebin Lin zhanhua wei Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu611731China Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamen361021China

This highlight mainly focuses on the recent meaningful research progress of single crystals(SCs)perovskite lightemitting diodes(LEDs)made by Xiao et al.[1],published in Nature *** made a breakthrough in the in-situ preparation of micron-thick SCs-based perovskite films on the ITO/hole-transporter layer and successfully fabricated the LEDs.

关键词： diodes perovskite breakthrough

Can two-dimensional graphdiyne-based materials be novel materials for perovskite solar cell applications?

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Materials Futures 2023年第2期2卷 142-151页

Two-dimensional(2D)graphdiyne(GDY)-based materials have attracted attention in the solar cell research community owing to their unique physicochemical properties and hydrophobic nature which can serve as moisture resistance from the surrounding *** from these,the performance and stability ofperovskite solar cells(PSCs)can be greatly improved via the addition of 2D GDY-based *** mini-review summarizes the recent development of 2D GDY-based materials for PSC *** roles of 2D GDY-based materials,such as hole transporting material,electron transporting material,dopant material in perovskite film and interfacial layer,are discussed in ***,we provide future perspectives in this field,aiming to help further progress efficient and stable 2D GDY-based materials in PSCs.

关键词： two-dimensional material graphdiyne perovskite solar cells power conversion efficiency stability

Progress toward understanding the fullerene-related chemical interactions in perovskite solar cells

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Nano Research 2022年第8期15卷 7139-7153页

作者： Kaikai Liu Chengbo Tian Yuming Liang Yujie Luo Liqiang Xie zhanhua wei Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamen 361021China

Fullerene materials have been widely used to fabricate efficient and stable perovskite solar cells(PSCs)due to their excellent electron transport ability,defect passivation effect,and *** studies have shown that fullerene-related chemical interaction has played a crucial role in determining device ***,the corresponding fullerene-related chemical interactions are yet well ***,a comprehensive review of fullerene materials in regulating carrier transport,passivating the surface and grain boundary defects,and enhancing device stability is ***,the influence of the fullerene-related chemical interactions,including fullerene-perovskite,fullerene-inorganic electron transport layer(IETL),and fullerene-fullerene,on the device performance is well ***,we outline some perspectives for further design and application of fullerene materials to enhance the performance and commercial application of PSCs.

关键词： perovskite solar cells functional fullerenes chemical interactions device performance

The strategies for preparing blue perovskite light-emitting diodes

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Journal of Semiconductors 2020年第5期41卷 26-33页

作者： Jianxun Lu zhanhua wei Institute of Luminescent Materials and Information Displays College of Materials Science and EngineeringHuaqiao UniversityXiamen 361021China

Metal halide perovskites have attracted tremendous interest due to their excellent optical and electrical properties,and they find many promising applications in the optoelectronic fields of solar cells,light-emitting diodes,and *** to the contributions of international researchers,significant progress has been made for perovskite light-emitting diodes(Pero-LEDs).The external quantum efficiencies(EQEs)of Pero-LEDs with emission of green,red,and near-infrared have all exceeded 20%.However,the blue Pero-LEDs still lag due to the poor film quality and deficient device ***,we summarize the strategies for preparing blue-emitting perovskites and categorize them into two:compositional engineering and size controlling of the emitting *** advantages and disadvantages of both strategies are discussed,and a perspective of preparing high-performance blue-emitting perovskite is *** challenges and future directions of blue PeroLEDs fabrication are also discussed.

关键词： perovskite blue light-emitting diodes

Chlorofullerene C_(60)Cl_(6) Enables Efficient and Stable Tin-Based Perovskite Solar Cells

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Energy & Environmental Materials 2024年第1期7卷 176-183页

作者： Jingfu Chen Chengbo Tian Chao Sun Panpan Yang Wenjing Feng Lingfang Zheng Liu Yang Enlong Hou Jiefeng Luo Liqiang Xie zhanhua wei Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamen 361021China

Tin-based perovskite solar cells(TPSCs)have received great attention due to their eco-friendly properties and high theoretical ***,the fast crystallization feature of tin-based perovskites leads to poor film quality and limits the corresponding device ***,a chlorofullerene,C_(60)Cl_(6),with six chlorine attached to the C_(60)cage,is applied to modulate the crystallization process and passivate grain boundary defects of the perovskite *** chemical interactions between C_(60)Cl_(6)and perovskite components retard the transforming process of precursors to perovskite crystals and obtain a high-quality tin-based perovskite *** is also revealed that the C_(60)Cl_(6)located at the surfaces and grain boundaries can not only passivate the defects but also offer a role in suturing grain boundaries to suppress the detrimental effects of water and oxygen on perovskite films,especially the oxidation of Sn^(2+)to Sn^(4+).As a result,the C_(60)Cl_(6)-based device yields a remarkably improved device efficiency from 10.03%to 13.30%with enhanced *** work provides a new strategy to regulate the film quality and stability of TPSCs using functional fullerene materials.

关键词： crystallization regulation defect passivation fullerene derivative perovskites solar cell tin-based perovskite

Composition engineering to obtain efficient hybrid perovskite light-emitting diodes

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Frontiers of Optoelectronics 2020年第3期13卷 282-290页

作者： Chuanzhong YAN Kebin LIN Jianxun LU zhanhua wei These authors contributed equally to this work.Institute of Luminescent Materials and Information Displays College of Materials Science and EngineeringHuaqiao UniversityXiamen 361021China

Metal halide perovskites have received considerable attention in the field of electroluminescence,and the external quantum efficiency of perovsk'c lightemitting diodes has exceeded 20%.CH3NH3PbBr3 has been intensely investigated as an emitting layer in perovskite light-emitting ***,perovskite films comprising CH3NH3PbBr3 often exhibit low surface coverage and poor crystallinity,leading to high current leakage,severe nonradiative recombination,and limited device ***,we demonstrate a rationale for composition engineering to obtain high-quality perovskite *** first reduce pinholes by adding excess CH3NH3B1 to the actual CH3NH3PbBr3 films,and we then add CsBr to improve the crystalline quality and to passivate nonradiative *** a result,the(CH3NH3)1-xCSxPbBx based perovskite light-emitting diodes exhibit significantly improved external quantum and power efficiencies of 6.97%and 25.181m/W,respectively,representing an improvement in performance dozens of times greater than that of pristine CH3NH3PbBr3-based perovskite light-emitting *** study demonstrates that composition engineering is an effective strategy for enhancing the device performance of perovskite light-emitting diodes.

关键词： perovskite light-emitting diode(LED) composition engineering ion doping

Stabilizing semi-transparent perovskite solar cells with a polymer composite hole transport layer

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Nano Research 2024年第3期17卷 1500-1507页

作者： Yongbin Jin Huiping Feng Zheng Fang Liu Yang Kaikai Liu Bingru Deng Jingfu Chen Xueling Chen Yawen Zhong Jinxin Yang Chengbo Tian Liqiang Xie zhanhua wei Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamen 361021China

Semi-transparent perovskite solar cells(ST-PSCs)have broad applications in building integrated ***,the stability of ST-PSCs needs to be improved,especially in n-i-p ST-PSCs since the doped 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene(Spiro-OMeTAD)is unstable at elevated temperatures and high *** this work,aπ-conjugated polymer poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophene-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c:4',5'-c']dithiophene-4,8-dione)](PBDB-T)is selected to form a polymer composite hole transport layer(HTL)with *** sulfur atom of the thiophene unit and the carbonyl group of the polymer interact with the undercoordinated Pb2+at the perovskite surface,which stabilizes the perovskite/HTL interface and passivates the interfacial *** incorporation of the polymer also increases the glass transition temperature and the moisture resistance of *** a result,we obtain ST-PSCs with a champion efficiency of 13.71%and an average visible light transmittance of 36.04%.Therefore,a high light utilization efficiency of 4.94%can be ***,the encapsulated device can maintain 84%of the initial efficiency after 751 h under continuous one-sun illumination(at 30%relative humidity)at the open circuit and the unencapsulated device can maintain 80%of the initial efficiency after maximum power tracking for more than 1250 h under continuous one-sun illumination.

关键词： semi-transparent solar cells π-conjugated polymer composite hole transport layer building integrated photovoltaics

Phase Regulation and Defect Passivation Enabled by Phosphoryl Chloride Molecules for Efficient Quasi‑2D Perovskite Light‑Emitting Diodes

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Nano-Micro Letters 2023年第8期15卷 181-191页

作者： Mingliang Li Yaping Zhao Jia Guo Xiangqian Qin Qin Zhang Chengbo Tian Peng Xu Yuqing Li Wanjia Tian Xiaojia Zheng Guichuan Xing Wen‑Hua Zhang zhanhua wei Sichuan Research Center of New Materials Institute of Chemical MaterialsChina Academy of Engineering PhysicsChengdu 610200People’s Republic of China Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamen 361021People’s Republic of China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoTaipaMacao 999078People’s Republic of China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005People’s Republic of China School of Materials and Energy Yunnan UniversityKunming 650050People’s Republic of China

Quasi-2D perovskites have attracted tremendous interest for application as lightemission layers in light-emitting diodes(LEDs).However,the heterogeneous n phase and non-uniform distribution still severely limit the further development of quasi-2D perovskite LEDs(Pero-LEDs).Meanwhile,the increased defect density caused by the reduced dimension and grain size induces non-radiative recombination and further deteriorates the device ***,we found that a series of molecules containing phosphoryl chloride functional groups have noticeable enhancement effects on the device performance of quasi-2D ***,we studied the modification mechanism by focusing on the bis(2-oxo-3-oxazolidinyl)phosphinic chloride(BOPCl).It is concluded that the BOPCl can not only regulate the phase distribution by decreasing the crystallization rate but also remain in the grain boundaries and passivate the *** a result,the corresponding quasi-2D Pero-LEDs obtained a maximum external quantum efficiency(EQE_(max))of 20.82%and an average EQE(EQE_(ave))of around 20%on the optimal 50 devices,proving excellent *** work provides a new selection of molecular types for regulating the crystallization and passivating the defects of quasi-2D perovskite films.

关键词： Quasi-2D perovskite Phosphoryl chloride functional group Crystallization control N phase control Passivation

Side-chain cyclization enhancing molecular rigidity and π-πstacking yields as-cast binary organic solar cells with 19.1%efficiency

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Science China Chemistry 2024年

作者： Lang Li wei Gao Ruijie Ma Xinjing Zhao Top Archie Dela Pe?a Jiaying Wu Jianxin Tang zhanhua wei Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information Displays College of Materials Science and Engineering Huaqiao University Department of Electrical and Electronic Engineering Research Institute for Smart Energy (RISE) Photonic Research Institute (PRI) The Hong Kong Polytechnic University Advanced Materials Thrust Function Hub The Hong Kong University of Science and Technology Nansha Macao Institute of Materials Science and Engineering (MIMSE) Faculty of Innovation Engineering Macau University of Science and Technology

High-performance as-cast organic solar cells (OSCs) are rarely reported due to the challenges in achieving high-quality active layer morphology via a single-step process. Herein, four small molecule acceptors (SMAs) substituted with cyclic alkyl chains of varying carbon numbers were synthesized and utilized to fabricate highly efficient as-cast OSCs. The side-chain cyclization strategy significantly enhances molecular rigidity and strengthens intermolecular packing, particularly in Se-Cb, which exhibits an excellent three-dimensional (3D) stacking framework with aπ-πstacking distance as short as 3.34?. As the size of cyclic alkyl chain increases, the packing mode of SMA single crystals shift from 3D to 2D, accompanied by a greaterπ-πstacking distance due to increased steric hindrance. As-cast binary devices based on D18/Se-Cb achieved a record power conversion efficiency (PCE) of 19.1%with a fill factor (FF) exceeding 80%, and a certified value of 18.45%. Se-Cb forms a more uniform vertical phase separation morphology than the control SMA within the D18 matrix, enhancing carrier transport and significantly suppressing sub-nanosecond bimolecular recombination. This study systematically investigates the effects of cyclic alkyl chain substitution on the properties and photovoltaic performance of SMAs, identifying cyclobutyl as a promising candidate for efficient as-cast OSCs with high FF.

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