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composition engineering to obtain efficient hybrid perovskite light-emitting diodes

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 diodes.However,perovskite films comprising CH3NH3PbBr3 often exhibit low surface coverage and poor crystallinity,leading to high current leakage,severe nonradiative recombination,and limited device performance.Herein,we demonstrate a rationale for composition engineering to obtain high-quality perovskite films.We 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 defects.As 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 diodes.Our 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

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Boosted urea electro-oxidation over Ni_(3)N-based nanocomposite via systematic regulation tactic

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Journal of Energy Chemistry 2023年第12期87卷 479-490,I0013页

作者： Ping Li Yuqi Huang Quhua Huang Wenqin Li Shuanghong Tian School of Environmental Science and engineering Sun Yat-sen UniversityGuangzhou 510275GuangdongChina Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou 510275GuangdongChina

Exploiting high-efficiency Ni-based materials for electrocatalytic urea oxidation reaction(UOR) is critical for urea-related technologies.The catalytic site density,intrinsic activity,charge transfer,and mass diffusion determine overall electrocatalytic efficiency.Simultaneous modulation over the above four factors promises advanced electrocatalysis,yet challenging.Herein we propose a systematic regulation tactic over composition and geometric structure,constructing a nanocomposite comprising Mn doped Ni_(3)N nanoparticles anchored on reduced graphene oxide(rGO/Mn-Ni_(3)N),achieving elegant integration of four design principles into one,thereby eminently boosting UOR.Particularly,Mn doping in Ni_(3)N can modulate electronic state to induce intrinsic activity regulation.Combining metallic Mn-Ni_(3)N with rGO to engineer hierarchical architecture not only promotes charge transfer,but also enriches active site population.Intriguingly,improved hydrophilicity could impart better electrolyte penetration and gas escape.Consequently,such system-optimized rGO/Mn-Ni_(3)N demonstrates state-of-the-art-level UOR electrocatalysis.This work offers a novel paradigm to create advanced catalysts via systematic and integrated modulation.

关键词： Ni_(3)N Geometric structure composition engineering Systematic regulation Urea oxidation

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High-performance self-powered color filter-free blue photodetector based on wide-bandgap halide perovskites

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Journal of Materials Science & Technology 2023年第21期152卷 100-108页

作者： Yeonghun Yun Hanbyeol Cho Jina Jung Sung Woong Yang Devthade Vidyasagar Rajendra Kumar Gunasekaran Sangwook Lee School of Materials Science and engineering Kyungpook National University(KNU)Daegu 41566South Korea KNU Advanced Material Research Institute Kyungpook National UniversityDaegu 41566South Korea Institute of Microstructure Technology&Light Technology Institute Karlsruhe Institute of TechnologyKarlsruhe 76131Federal Republic of Germany

Blue photodetectors(PDs)are attracting great attention for various applications.Commercial blue PDs based on inorganic GaP or InGaN absorbers are limited by their expensive,complex,and high-temperature fabrication techniques.Organic absorber-based blue PDs still have much lower photode-tecting properties than inorganic blue PDs.In this study,a high-performance self-powered blue PD is developed using methylammonium lead halide(MAPbX_(3);X=I,Br,and Cl)perovskites based on the eco-nomic and facile solution process at low temperatures.Optimal composition is obtained through halide-composition engineering.Our best-performing device exhibits an average external quantum efficiency and an average detectivity of 42.7%and 8.65×10^(11) Jones,respectively,within the blue region.The peak responsivity of the proposed PD is 0.174 A W^(−1) at 455 nm,which is comparable to that of commercial gallium phosphide blue PD(0.180 A W^(−1) at 470 nm).Moreover,the proposed device exhibits excellent environmental stability under ambient air conditions.These findings will act as a basis for next-generation image sensor technologies,such as vertically stacked red/green/blue PDs.

关键词： Perovskites Photodetectors Blue composition engineering Self-powered Wide bandgap

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Advances in perovskite quantum-dot solar cells

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Journal of Energy Chemistry 2021年第1期30卷 351-353,I0011页

作者： Aili Wang Zhiwen Jin Ming Cheng Feng Hao Liming Ding School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina School of Physical Science and Technology Key Laboratory for Magnetism and Magnetic Materials(MoE)Lanzhou UniversityLanzhou 730000GansuChina Institute for Energy Research Jiangsu UniversityZhenjiang 212013JiangsuChina Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Perovskite quantum-dots (PQDs) have emerged as prominent candidates for intriguing photovoltaic application due to their superior optoelectronic properties such as multiple exciton generation, bandgap tunability, elec... 详细信息

关键词： Charge transport Ligand capping Defect passivation composition engineering

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Blade-coating Perovskite Films with Diverse compositions for Efficient Photovoltaics

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Energy & Environmental Materials 2021年第3期4卷 277-283页

作者： Jun-Xing Zhong Wu-Qiang Wu Liming Ding Dai-Bin Kuang MOE Key Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-sen UniversityGuangzhou 510275China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

In this research highlight,recent significant advances with hot-assisted blade-coating or air knife-assisted blade-coating of different perovskite compositions with bandgaps ranging from 1.3 eV to 1.9 eV(i.***.widebandgap or small-bandgap perovskites with mixed cations and anions,2D/3D perovskites,Pb/Sn binary perovskites,and all-inorganic perovskites)for single-junction or tandem PSCs are discussed,with an emphasis on elucidating the distinct ink formulation engineering strategies,crystal growth mechanisms,crystallization kinetics,and optoelectronic properties of the different perovskite compositions.

关键词： perovskite solar cells blade-coating composition engineering bandgaps power conversion efficiencies

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