The latest review of the material frontier
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Figure 1 Spectral position and PL peak organic halide perovskite is widely used in optoelectronics research. Methylammonium and formazan iodide as photovoltaic materials show excellent optoelectronic properties, which has inspired researchers to illuminate devices and optoelectronics. The research enthusiasm of the detector. Recently, the team of Edward H. Sargent (corresponding author) of the University of Toronto studied the optical and electrical properties of organometallic halide perovskites. It outlines how material composition and morphology are associated with these properties, and how these properties ultimately affect device performance. In addition, the team analyzed different perovskite materials to estimate their material properties, especially bandgap, mobility, diffusion length, carrier lifetime and trap state density. 2. Advanced Materials Review: Photoelectric Applications of 2D Organic Materials 
Figure 2 Several key steps in the application of two-dimensional organic materials 2D materials with atomic-scale thin structures and optoelectronic properties have caused great interest in the application of 2D materials to electronics and optoelectronics. In addition, as an emerging field of two-dimensional material series, the assembly of organic nanostructures into 2D forms offers molecular diversity, flexibility, ease of processing, and light weight, providing exciting prospects for optoelectronic applications. Recently, Professor Hu Wenping and Ren Xiaochen, Assistant Research Fellows (Communication) of Tianjin University reviewed the application of organic two-dimensional materials in optoelectronic devices. Examples of materials include 2D, organic, crystalline, small molecules, polymers, self-assembled monolayers and Covalent organic skeleton. The scheme of 2D organic crystal fabrication and patterning technology is also discussed. Then the application of optoelectronic devices is introduced in detail, and the prospect of 2D materials is briefly prospected. 3. Advanced Materials Review: 2D Ruddlesden–Popper Perovskite Photonics Study 
Figure 3 Schematic diagram of 3D and 2D perovskite structures Traditional 3D organic-inorganic halide perovskites have recently experienced unprecedented rapid development. However, their inherent instability to moisture, light and heat remains a key challenge before commercialization. In contrast, the emerging two-dimensional Ruddlesden-Popper-type perovskites are receiving more and more attention due to their environmental stability. However, research on 2D perovskites has just begun. Recently, a review of the team of Liang Zikai (communication author) of Fudan University first introduced a detailed comparison of 2D perovskite and 3D control. Then two-dimensional perovskite organic spacer cation engineering was discussed. Next, a quasi-two-dimensional perovskite between 3D and 2D perovskites was studied and compared. In addition, the unique exciton properties of 2D perovskites, electron-phonon coupling and polarons are also demonstrated. Finally, a reasonable summary of the structural design, growth control and photophysical research strategies of high-performance electronic devices 2D perovskite is proposed. 4. Overview of Science Advances: Lead-halide perovskite: crystal-liquid duality, formation of phononic glass electronic crystals and large polarons 
Figure 4 Structure of CH3NH3PbX3 perovskite Lead anode perovskite has proven to be a high performance material in solar cells and light-emitting devices. The characteristics of these materials are derived from the expected coherent band transport of crystalline semiconductors, as well as the dielectric response and phonon dynamics of liquids. This "crystal-liquid" duality means that lead halide perovskites belong to phononic glass electronic crystals - one of the most efficient thermoelectric materials. Recently, the team of Columbia University Zhu Xiaoyang (communication author) reviewed the crystal-liquid duality, and the resulting dielectric response is responsible for the formation and screening of carrier polarons, which leads to perovskite defect tolerance, moderate The carrier mobility and the composite properties of the radiation. Large polaron formation and phononic glass characteristics can also account for a significant reduction in the rate of carrier cooling in these materials. 5. Progress in Polymer Science: Lithographic applications for silicon-containing block copolymers 
Figure 5 Dimer block copolymer melt phase diagram Recently, National University of Tsinghua University Rong-Ming Ho (corresponding author) and others published a review summarizes the recent progress in the preparation of ordered block copolymer (BCP) films by different methods, focusing on research Silicon-containing BCP is used as a lithography application. By virtue of the inclusion of Si blocks, these BCPs have smaller feature sizes due to their high resolution, large segregation strength and high etch contrast. Considering that poly(dimethylsiloxane) (PDMS) has been extensively studied in Si-containing BCPs, the possibility of using lithography applications using PDMS-containing BCP has been demonstrated by previous and ongoing studies. The main results of the DSA approach are detailed in the subsequent sections. The new trends in lithographic applications and the application of lithographic nanopatterns using silicon-containing BCPs are also discussed. Finally, the conclusions and prospects of BCP lithography are introduced. 6. Angewandte Chemie International Edition Review: Theoretical Study of CH3NH3PbI3 Perovskite Solar Cells 
Figure 6. Hybridized halo-perovskite solar cells (PSCs) with more than 22% electron density pattern power conversion efficiency (PCEs) have attracted considerable attention. Although perovskites play an important role in the operation of PSCs, the basic theories related to perovskites remain unresolved. Recently, Professor Yun Sining (communication author) of Xi'an University of Architecture and Technology and others evaluated the structure and electronic properties of CH3NH3PbI3 perovskite based on first-principles calculations, defects, current theory of ion diffusion and transfer current, and ion transport. Effect on PSC current-voltage curve lag. The mobile current associated with the possible presence of ferroelectricity is also discussed. It also highlights the benefits, challenges and potential of perovskites for PSCs. 7. Chemical Society Reviews: Molecular Engineering of Organic Electroactive Materials for Redox Cells 
Figure 7 Molecular engineering of redox species for sustainable RFBs As an important large-scale energy storage system, redox cells (RFBs) have high scalability and independent energy and power control capabilities. However, the application of conventional RFB is limited by performance and the high cost and environmental issues associated with the use of metal-based redox species. Recently, the team of Guihua Yu (Corresponding author) of the University of Texas at Austin proposed a systematic molecular engineering program for designing these new redox species. The article provides a detailed synthesis strategy for modifying organometallic and organometallic redox species in terms of solubility, redox potential and molecular size. Recent developments are also presented, covering the reaction mechanisms, specific functionalization methods and electrochemical properties of redox species classified by their molecular structure. Finally, the author analyzes the future development direction and challenges of this emerging research field. 8. Chemical Society Reviews: Atomic-scale non-layered nanomaterials for energy storage and conversion 
Figure 8 Atomic Thickness Layered and Non-Layered Nanomaterials After the discovery of graphene, two-dimensional nanomaterials with large atomic thickness and large lateral dimensions are highly affected by their high specific surface area, heterogeneous electronic structure and fascinating physicochemical properties. Great research interest. Recently, the team of Dou Shi, a graduate student of the University of Wollongong (communication author) comprehensively summarized the preparation method of non-layered nanomaterials with atomic thickness, studied its heterogeneous electronic structure, introduced the operational strategy of electronic structure, and outlined its energy storage and conversion. Applications, with particular emphasis on lithium-ion batteries, sodium-ion batteries, oxygen evolution, CO2 reduction, CO oxidation reactions. Finally, based on the current research progress, the future direction is proposed - in the practical application to explore the performance and novel features. 9. Chemical Reviews Overview: Electrochemistry in the Synthesis of Heterocyclic Structures 
Figure 9. Mechanism of Electro-Induced Cationic Chain Reactions Heterocycles are one of the largest organic compounds to date, and the preparation and conversion of heterocyclic structures have been of great interest to organic chemistry researchers. Various heterocyclic structures are widely found in bioactive natural products, organic materials, agrochemicals and pharmaceuticals. When people notice that about 70% of all drugs and agrochemicals have at least one heterocyclic ring, one cannot ignore them. importance. Recently, Professor Zeng Chengchu (Corresponding Author) of Beijing University of Technology reviewed the progress of electrochemical construction of heterocyclic compounds published by intramolecular and intermolecular cyclization reactions since 2000.