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| 1 | Engineering the Interfacial Materials of Organic Field-Effect Transistors for Efficient Charge Transport显示文摘CONSPECTUS:The development of organic field-effect transistors(OFETs)has witnessed impressive advances in organic electronics,which has broad application prospects in artificial intelligence,information technology,energy storage,and medical treatments.How to reveal the interface behavior of charge carriers and how to obtain efficient charge transfer of OFETs are very important scientific issues,which are essential for the construction of highperformance OFETs and also for the further understanding of the intrinsic properties of organic semiconductor materials.To this end,the investigation of interfacial materials and related interface engineering is an effective and promising approach,offering potential capabilities of optimizing molecular packing of semiconductors,interface energy alignments,growth morphology,charge injection/output,and contact resistance for efficient charge transport.In this Account,we present our recent progress on engineering the interface materials of OFETs for efficient charge transport.Polymer dielectrics as indispensable components of OFETs have the capability of tuning the charge transport by modulating the interface,such as surface functionalization,chemical structural optimization,and self-assembly of functional groups into nanostructures.It is noted that the chemical-structure engineered polymer dielectrics endowing them with nanostructures on their surfaces represent a promising method for interface engineering.Besides pure polymer dielectrics,surface self-assembled monolayers also well-tune molecular packing of semiconductors for efficient photogenerated carrier transport in optoelectronic devices.In comparison with dielectric modulation,micro-/nanopatterning of source/drain electrodes is a novel and effective approach to optimize device interfaces and improve device performance for efficient charge transfer.Different from the bulk film,the monolayer semiconductor might produce highly efficient charge transport because of its two-dimensional nature with fewer grain boundaries and interface defects.Thanks to the charge density redistribution occurring at semiconductor/dielectric interface,the monolayer semiconductor on a pure polymer dielectric exhibited highly efficient charge transport.Interface engineering has promoted the significant progress of OFETs in the preceding years.We hope the above-mentioned methodologies of engineering the interfacial materials(e.g.,the dielectric,semiconductor and electrode)to achieve efficient charge transport of OFETs in this Account will offer a new strategy for designing high-performance optoelectronic devices. | Deyang Ji Liqiang Li Harald Fuchs Wenping Hu | 2021 | Accounts of Materials Research2021，2，3： | 3 |
| 2 | Aggregation-induced emission:Red and near-infrared organic light-emitting diodes显示文摘Red and near-infrared(NIR)organic light-emitting diodes(OLED)have gained remarkable interest due to their numerous applications.However,the construction of highly emissive emitters is hampered by the energy-gap law and aggregation-caused quenching(ACQ)effect.Whereas,aggregationinduced emission(AIE)materials could avoid the undesirable ACQ effect and emit bright light in aggregated state,which is one class of the most promising materials to fabricate high-performance OLED with a high external quantum efficiency and low efficiency roll-off.This review summarizes recent advances in red and NIR OLED with AIE property,including the traditional fluorescence,thermally activated delayed fluorescence,and hybridized local and charge transfer compounds.Meanwhile,the emphasis attention is paid to the molecular design principles,as well as the molecular structure-photophysical characteristics.We also briefly further outlook the challenges and perspective of red and NIR AIE luminogens. | Liangjing Tu Yujun Xie Zhen Li Benzhong Tang | 2021 | SmartMat2021，2，3： | 1 |
| 3 | Incorporation of hydrogen-bonding units into polymeric semiconductors toward boosting charge mobility,intrinsic stretchability,and self-healing ability显示文摘The soft nature has endowed conjugated polymers with promising applications in a wide range of field-effect transistor(FET)based flexible electronics.With unremitting efforts on revealing the molecular structure-property relationships,numerous novel conjugated polymers with high mobility and excellent mechanical property have been developed in the past decades.Incorporating hydrogen-bonding(H-bonding)units into semiconducting polymers is one of the most successful strategies for designing high-performance semiconducting materials.In this review,we aim to highlight the roles of H-bonding units in the performances of polymeric FETs from three aspects.These include(i)charge mobility enhancement for semiconducting polymers after incorporation of H-bonding units into the side chains,(ii)the effects of H-bonding units on the stretchability of conjugated polymers,and(iii)the improvement of self-healing properties of conjugated polymers containing dynamic hydrogen bonds due to the H-bonding units in the side chains or conjugated backbones. | Xiaobo Yu Cheng Li Chenying Gao Xisha Zhang Guanxin Zhang Deqing Zhang | 2021 | SmartMat2021，2，3： | 1 |
| 4 | Optical and electrical modulation in ultraviolet photodetectors based on organic one-dimensional photochromic arrays显示文摘Organic photochromic materials have drawn considerable attention for their potential applications in large-scale and low-cost optoelectronics owing to unique tunable physicochemical properties.For organic photodetectors,photochromic materials have realized optical and electrical engineering of semiconductor layers,which incorporate not only tunable performance,but also functionalities to optoelectronic devices.However,the essential challenge is to assemble large-area photochromic micro-and nanostructure arrays with controllable geometry and precise alignment,which restricts the integration of multifunctional optoelectronic devices.Herein,we fabricate organic photochromic one-dimensional(1D)arrays via a feasible solution process through the confined crystallization of organic molecules.By modulating and controlling the photoisomerization behaviors,these 1D photochromic arrays possess broad spectral tunability,which ensure tunable photoresponse.Furthermore,we investigate the crystallographic transition and electronic performance variation of these 1D photochromic arrays.By adjusting the dwell time of ultraviolet(UV)irradiation,the UV photochromic photodetectors realize tunable and repeatable responsivity from 85.6 to 0.709 mA/W.Our work provides new possibilities for optical and electrical engineering of photochromic microwires towards the integration of multifunctional optoelectronic devices. | Yue Geng Yingjie Zhao Jinjin Zhao Yu Zhai Meng Yuan Xue-Dong Wang Hanfei Gao Jiangang Feng Yuchen Wu Lei Jiang | 2021 | SmartMat2021，2，3： | 0 |
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