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Chinese Chemical Letters 2022年第1期33卷 547-550页

作者： Yifei Yue Shengnan Liu Ning Zhang Zhongmin Su Dongxia Zhu Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province Department of ChemistryNortheast Normal UniversityChangchun 130024China

We develop the effective modification strategy based on molecular engineering of s-triazine and its derivatives to improve the photoelectric performance of all-inorganic perovskites(AIP)for the first *** surface modification strategy with cyanuric acid successfully increases the PLQY of AIP from 40.55%to 88.15%,and significantly enhances the current of the AIP film under 3 V by almost 20-fold(from4.44 m A to 81.20 m A).This work has proven the effectiveness of improving the photoelectric performances of AIP via s-triazine and its derivatives and also suggested the potential risks of reducing the photoelectric performance of AIP due to inappropriate substituents in conjugated organic ligands.

关键词： all-inorganic perovskites Surface modification s-Triazine Substituents Photoelectric performance

Reveal the large open-circuit voltage deficit of all-inorganic CsPbIBr_(2) perovskite solar cells

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Chinese Physics B 2022年第3期31卷 66-75页

作者：胡颖王家平赵鹏林珍华张思玉苏杰张苗张进成常晶晶郝跃 State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi'an 710071China Advanced Interdisciplinary Research Center for Flexible Electronics Xidian UniversityXi'an 710071China

Due to excellent thermal stability and optoelectronic properties, all-inorganic perovskite is one of the promising candidates to solve the thermal decomposition problem of conventional organic–inorganic hybrid perovskite solar cells(PSCs),but the larger voltage loss(V_(loss)) cannot be ignored, especially CsPbIBr_(2), which limits the improvement of efficiency. To reduce V_(loss), one promising solution is the modification of the energy level alignment between the perovskite layer and adjacent charge transport layer(CTL), which can facilitate charge extraction and reduce carrier recombination rate at the perovskite/CTL interface. Therefore, the key issues of minimum V_(loss) and high efficiency of CsPbIBr_(2)-based PSCs were studied in terms of the perovskite layer thickness, the effects of band offset of the CTL/perovskite layer, the doping concentration of the CTL, and the electrode work function in this study based on device simulations. The open-circuit voltage(V_(oc)) is increased from 1.37 V to 1.52 V by replacing SnO_(2) with ZnO as the electron transport layer(ETL) due to more matching conduction band with the CsPbIBr;layer.

关键词： all-inorganic perovskites CsPbIBr_(2)solar cells device simulation voltage loss Silvaco TCAD

Discrete composition control of two-dimensional morphologic all-inorganic metal halide perovskite nanocrystals

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Journal of Energy Chemistry 2021年第8期30卷 257-275,I0006页

作者： Andrew Hunter Davis Weiwei Zheng Department of Chemistry Syracuse University13244 SyracuseUnited States

Metal halide perovskite nanocrystals(NCs)exhibit impressive optical and electronic properties,making them an important class of functional materials with promising applications in solar cells,light emitting diodes(LEDs),photodetectors,and *** addition to the widely studied 0-dimensional(0 D)metal halide perovskite NCs,such as nanocubes,low dimensional perovskites,such as 2 D all-inorganic perovskite(AIP)NCs,subsist with directionally relevant quantum *** anisotropic NCs have the propensity to exhibit interesting optoelectronic properties that are exceedingly difficult to introduce into 0 D systems,yet as of late are largely *** this review,we discuss the recent synthetic progress of 2 D all-inorganic metal halide perovskite NCs with ABX3 ***,we highlight the discrete composition control of the cations(A and B sites)and anions(X site)by dopant incorporation and alloying in 2 D metal halide perovskite *** will also discuss more complex perovskite crystal structures,such as Ruddlesden-Popper double perovskites,and compare these materials to 0 D perovskite ***,our work culminates in the future interests and perspectives of this field with a focus on the wide applicability of 2 D systems and the large variance in structure capable with discrete compositional tuning.

关键词： all-inorganic perovskites Two-dimensional nanocrystals Composition Doping alloying Ion exchange

Fully-inorganic strontium incorporated CsPbI_(2)Br perovskite solar cells with promoted efficiency and stability

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Journal of Energy Chemistry 2021年第11期30卷 451-458,I0010页

作者： Jyoti V.Patil Sawanta S.Mali Chang Kook Hong Optoelectronic Convergence Research Center School of Advanced Chemical EngineeringChonnam National UniversityGwangju 61186South Korea Polymer Energy Materials Laboratory School of Advanced Chemical EngineeringChonnam National UniversityGwangju 61186South Korea

In the present investigation, we fabricated strontium (Sr2+) incorporated CsPbI2Br-based inorganic perovskite solar cells in ambient conditions. The morphology, crystallinity, absorption, elemental composition and photoluminescence analysis of the bare CsPbI2Br and CsPb1-xSrxI2Br perovskite thin films were studied systematically to investigate the role of Sr2+ incorporation. It is observed that the surface morphology of the CsPbI2Br perovskite thin film has been improved by partial substitution of Pb2+ by Sr2+ which facilitates photoactive black phase-stabilization and defect passivation. The champion device having CsPb0.98Sr0.02I2Br composition exhibited a power conversion efficiency (PCE) of 16.61% which is much higher than the bare device (13.65%). Furthermore, our CsPb0.98Sr0.02I2Br-based devices maintain > 85% of its initial efficiency over 100 h in ambient conditions.

关键词： all-inorganic perovskites Strontium incorporation Deposition method Phase stability Promoted efficiency

Recent advances in resistive random access memory based on lead halide perovskite

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InfoMat 2021年第3期3卷 293-315页

作者： Jiayu Di Jianhui Du Zhenhua Lin Shengzhong(Frank)Liu Jianyong Ouyang Jingjing Chang State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Shaanxi Joint Key Laboratory of GrapheneSchool of MicroelectronicsXidian UniversityXi'anChina Advanced Interdisciplinary Research Center for Flexible Electronics Xidian UniversityXi'anChina Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologyInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'anChina Department of Materials Science and Engineering National University of SingaporeSingaporeSingapore

Lead halide perovskites have attracted increasing attention in photovoltaic devices,light-emitting diodes,photodetectors,and other fields due to their excellent *** optoelectronic devices,growing numbers of studies have focused on the perovskite-based electrical devices in the past few years,such as transistors and resistive random access memories(RRAMs).Here,this article summarizes the recent progress the researchers have made of RRAM ***,the working mechanism and the key parameters of RRAM are ***,the working principles,including the conductive filament model(containing the types of the model of the metal cationsinduced filament and the model of the ions migration in bulk),the interface effect,and the electronic effect are the origins of the RRAM behaviors,and hence,various factors that affect the device performance are ***,RRAMs based on organolead halide perovskite and all-inorganic perovskite are discussed in terms of different structures,different compositions,and different fabrication ***,a brief conclusion and a broad outlook are given on the progress and challenges in the field of perovskite-based RRAMs.

关键词： all-inorganic perovskites conductive filament models organolead halide perovskites resistive random access memories resistive switching