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Unraveling the Effect of Stacking Configurations on Charge Transfer in WS_(2) and organic Semiconductor Heterojunctions

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Precision Chemistry 2023年第7期1卷 443-451页

作者： Shuchen Zhang Dewei Sun Jiaonan Sun Ke Ma Zitang Wei Jee Yung Park Aidan H.Coffey Chenhui Zhu Letian Dou Libai Huang Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIndiana 47907United States Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720United States Department of Chemistry Purdue UniversityWest LafayetteIndiana 47907United States

Photoinduced interfacial charge transfer plays a critical role in energy conversion involving van der Waals(vdW)heterostructures constructed of inorganic nanostructures and organic ***,the effect of molecular stacking configurations on charge transfer dynamics is less *** this study,we demonstrated the tunability of interfacial charge separation in a type-Ⅱ heterojunction between monolayer(ML)WS_(2) and an organic semiconducting molecule[2-(3″′,4′-dimethyl-[2,2′:5′,2′:5″,2″′-quaterthiophen]-5-yl)ethan-1-ammonium halide(4Tm)]by rational design of relative stacking *** assembly between ML-WS_(2) and the 4Tm molecule forms a face-to-face stacking when 4Tm molecules are in a selfaggregation *** contrast,a face-to-edge stacking is observed when 4Tm molecule is incorporated into a 2D organic-inorganic hybrid perovskite *** face-to-face stacking was proved to be more favorable for hole transfer from WS_(2) to 4Tm and led to interlayer excitons(IEs)*** absorption measurements show that the hole transfer occurs on a time scale of 150 *** the other hand,the face-to-edge stacking resulted in much slower hole transfer without formation of *** inefficient hole transfer occurs on a similar time scale as A exciton recombination in WS_(2),leading to the formation of negative *** investigations offer important fundamental insights into the charge transfer processes at organic−inorganic interfaces.

关键词： Charge transfer two-dimensional materials organic semiconductors heterojunction stacking configuration interlayer exciton

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Grain boundary engineering of organic semiconductor films in organic transistors

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Aggregate 2023年第6期4卷 27-43页

作者： Yanpeng Wang Shougang Sun Yinan Huang Yao Fu Jiannan Qi Kai Tie Zhongwu Wang Fei Jiao Rongmei Si Xiaosong Chen Liqiang Li Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistryInstitute of Molecular Aggregation ScienceSchool of ScienceTanjin UniversityTanjinChina Haihe Laboratory of Sustainable Chemical Transformations TianjinChina Department of Materials Science and Engineering.Tianjin College University of Science and Technology BeijingTinjinChina Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhouChina

organicﬁeld-effect transistors(OFETs)show great application potential in organic electronic and optoelectronicﬁelds due to their excellent mechanicalﬂexibility,low cost,and solution ***,grain boundaries(GBs)disrupt the aggrega-tion state of organic semiconductor(OSC)ﬁlms and hinder electrical performance and stability,which limits the application of ***,the sensitive nature of GBs is widely used in sensing,but detailed descriptions of the GBs are *** review aims toﬁll this knowledge *** role of GBs and their effect on the per-formance and stability of OFETs are analyzed,followed by a detailed summary of the characterization of ***,strategies for suppressing the negative effects of GBs and utilizing the sensitive nature of GBs for application are ***,potential research directions for GBs in OFETs are discussed.

关键词： aggregation states electrical performance grain boundaries organic field-effect transistors organic semiconductors stability

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用于人工突触的染料敏化钙钛矿/有机半导体三元晶体管

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Science China Materials 2022年第9期65卷 2521-2528页

作者：王鑫郝丹丹黄佳 School of Materials Science and Engineering Interdisciplinary Materials Research CenterFrontiers Science Center for Intelligent Autonomous SystemsTongji UniversityShanghai 201804China Translational Research Institute of Brain and Brain-Like Intelligence Shanghai Fourth People’s Hospital Affiliated to Tongji UniversitySchool of Materials Science and EngineeringTongji UniversityShanghai 200434China

人工智能因其类脑工作模式和高效任务处理能力而受到广泛关注.光刺激突触器件在神经形态计算领域应用潜力巨大.本文报道了具有三元光敏材料体系的光刺激突触器件,该体系由有机金属卤化物钙钛矿CHNHPbBr、有机染料罗丹明B和有机半导体并... 详细信息

人工智能因其类脑工作模式和高效任务处理能力而受到广泛关注.光刺激突触器件在神经形态计算领域应用潜力巨大.本文报道了具有三元光敏材料体系的光刺激突触器件,该体系由有机金属卤化物钙钛矿CHNHPbBr、有机染料罗丹明B和有机半导体并五苯组成.我们发现,通过引入罗丹明B,复合器件的光吸收和光响应性能得到显著提升.通过调整输入信号,复合器件表现出了良好的仿真学习行为.并且,这些器件可对强度低至1.1μW cm^(-2)的光信号响应,并能在低电压下进行工作.器件在-50μV的源漏电压下实现了1.25 fJ的超低功耗,这一能量损耗与单次生物突触活动的能耗相当.此外,复合突触器件还实现了自我学习过程,表现出了良好的学习效率.同时,它们可识别不同摩斯电码之间的细微差别,未来可应用于加密信息解码领域.本文所提出的三元突触器件拥有优异的光性能,在开发人工智能方面具有广泛的应用前景.

关键词： perovskites Rhodamine B organic semiconductors synapses artificial intelligence

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有机半导体增强介电屏蔽效应以制备高效稳定的钙钛矿太阳能电池

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Science Bulletin 2022年第12期67卷 1243-1252,M0004页

作者：陈海阳成沁蓉刘恒程双王淑惠陈炜杰沈赟秀李欣琪杨海迪杨合一奚嘉琛陈子源路新慧蔺洪振李耀文李永舫 Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationSoochow UniversitySuzhou 215123China i-Lab Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Department of Physics Chinese University of Hong KongHong Kong 999077China Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190China

在钙钛矿太阳能电池(pero-SCs)中,载流子扩散过程中带电缺陷的捕获是其非辐射复合损失的主要来源,而常见的缺陷态钝化策略具有较强的尺寸依赖性,使得大面积应用受限.因此,本文通过精准设计合成高介电常数的p-型有机半导体,构筑了具备高... 详细信息

在钙钛矿太阳能电池(pero-SCs)中,载流子扩散过程中带电缺陷的捕获是其非辐射复合损失的主要来源,而常见的缺陷态钝化策略具有较强的尺寸依赖性,使得大面积应用受限.因此,本文通过精准设计合成高介电常数的p-型有机半导体,构筑了具备高介电常数的钙钛矿薄膜,增强了介电屏蔽效应,降低了载流子捕获概率,减少了非辐射复合损失.该本征策略表现出较低的钙钛矿组分和尺寸依赖性,基于此策略制备了效率为23.35%的小面积(0.062 cm^(2))和21.93%的大面积(1 cm^(2))器件;同时,该策略提高了器件的工作稳定性和热稳定性,为制备高性能的大面积pero-SCs开辟了一条新途径.

关键词： organic semiconductors Dielectric screening effect Reduced non-radiative recombination Operational stability Perovskite solar cells

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Developing molecular-level models for organic field-effect transistors

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National Science Review 2021年第4期8卷 167-180页

作者： Haoyuan Li Jean-Luc Brédas School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics Georgia Institute of Technology Department of Chemistry and Biochemistry University of Arizona

organic field-effect transistors(OFETs) are not only functional devices but also represent an important tool for measuring the charge-transport properties of organic semiconductors(OSs). Thus, efforts to understand the performance and characteristics of OFET devices are not only useful in helping achieve higher device efficiencies but also critical to ensuring accuracy in the evaluations of OS charge *** studies rely on OFET device models, which connect the measured current characteristics to the properties of the OSs. Developing such OFET models requires good knowledge of the charge-transport processes in OSs. In device active layers, the OS thin films are either amorphous(e.g. in organic light-emitting diodes and organic solar cells) or crystalline(e.g. those optimized for charge transport in OFETs). When the electronic couplings between adjacent OS molecules or polymer chain segments are weak, the charge-transport mechanism is dominated by hopping processes, which is the context in which we frame the discussion in this Review. Factors such as disorder, mobility anisotropy, traps, grain boundaries or film morphology all impact charge transport. To take these features fully into account in an OFET device model requires considering a nano-scale, molecular-level resolution. Here, we discuss the recent development of such molecular-resolution OFET models based on a kinetic Monte Carlo approach relevant to the hopping regime. We also briefly describe the applicability of these models to high-mobility OFETs,where we underline the need to extend them to incorporate aspects related to charge delocalization.

关键词： organic semiconductors charge transport kinetic Monte Carlo simulations mobility measurements gradual channel approximation

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Dual-function surfactant strategy for two-dimensional organic semiconductor crystals towards high-performance organic field-effect transistors

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Science China Chemistry 2021年第6期64卷 1057-1062页

作者： Zheng Chen Shuming Duan Xiaotao Zhang Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin University&Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin 300072China Joint School of National University of Singapore and Tianjin University Fuzhou International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China Institute of Molecular Aggregation Sciences Tianjin UniversityTianjin 300072China

Two-dimensional(2D)organic semiconductor crystals(OSCs)are ideal platforms for investigating fundament materials as well as achieving high-performance organic field-effect transistors(OFETs).The surfactants played an important role in the 2DOSCs growth in previous ***,residual surfactants may cause performance degradation of ***,a simple and effective dual-function surfactant strategy is used to control the growth of large-area few-molecular-layer *** introduction of phosphatidylcholine decreases the interfacial tension and improves the crystal growth dynamics,resulting in high-quality and large-area few-molecular-layer 2,6-bis(4-hexylphenyl)anthracene(C_6–DPA)*** additive also passivates charge traps,boosting the mobility of 2DOSC-based OFETs by almost *** method is also suitable for the growth of various high-quality 2DOSCs,opening up a new avenue for high-quality 2DOSCs towards high-performance OFETs.

关键词： two-dimensional crystals organic semiconductors organic field-effect transistors

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Electronic structure engineering in organic thermoelectric materials

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Journal of Energy Chemistry 2021年第11期30卷 204-219,I0005页

作者： Xiaojuan Dai Qing Meng Fengjiao Zhang Ye Zou Chong-an Di Daoben Zhu Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

Electronic structures, which play a key role in determining electrical and optical properties of π-conjugated organic materials, have attracted tremendous interest. Efficient thermoelectric (TE) conversion of organic materials has rigorous requirements on electronic structures. Recently, the rational design and precise modulation of electronic structures have exhibited great potential in exploring state-of-the-art organic TE materials. This review focuses on the regulation of electronic structures of organic materials toward efficient TE conversion. First, we present the basic knowledge regarding electronic structures and the requirements for efficient TE conversion of organic materials, followed by a brief introduction of commonly used methods for electronic structure characterization. Next, we highlight the key strategies of electronic structure engineering for high-performance organic TE materials. Finally, an overview of the electronic structure engineering of organic TE materials, along with current challenges and future research directions, are provided.

关键词： organic thermoelectric materials Electronic structure organic semiconductors

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Optimization of a poly (p-phenylene benzobisoxazole)-based light-emitting device with a complex cathode structure

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Chinese Physics B 2013年第11期22卷 607-611页

作者：张晓晋何志群汪璟穆林平赵瓛梁春军庄启昕韩哲文 Key Laboratory of Luminescence and Optical Information Ministry of Education Institute of Optoelectronic TechnologyBeijing Jiaotong University Key Laboratory for Specially Functional Polymeric Materials and Related Technology Ministry of Education East China University of Science and Technology

In this work, we report the preparation of a series of electroluminescent （EL） devices based on a high-performance polymer, poly（p-phenylene benzobisoxazole）（PBO）, and their optoelectronic properties, which have been rarely explored. The device structure is optimised using a complex cathode structure of tris-（8-hydoxyquinoline） aluminium （Alq3）/LiF/Al. By tuning the thickness of the Alq3 layer, we improve the device efficiency dramatically in an optimized condition. Further analysis reveals that the Alq3 layer in the complex cathode structure acts as a hole blocker in addition to its electron-injection role. A green light emission with a maximum brightness of 8.7×103 cd/m2 and a moderate current efficiency of 4.8 cd/A is obtained. These values are the highest ever reported for PBO devices. The high operational stability demonstrated by the present device makes it a promising tool for display and lighting applications. A new material is added to the selection of polymers used in this field up to now.

关键词： electroluminescence organic semiconductors light-emitting devices electronic transport phe-nomena

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Thieno[3,4-c]pyrrole-4,6-dione based copolymers for high performance organic solar cells and organic field effect transistors

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Chinese Chemical Letters 2016年第8期27卷 1277-1282页

作者： Pan He Xiao-Lan Qiao Qun Qian Hong-Xiang Li Department of Chemistry Shanghai University Shanghai Institute of organic Chemistry Chinese Academy of Sciences

Donor-acceptor type copolymers have wide applications in organic field-effect transistors and organic photovoltaic ***[3,4-c]pyrrole-4,6-dione（TPD）,as an electron-withdrawing unit,has been widely used in D-A type copolymers *** now,the highest power conversion efficiency and mobility of TPD-based copolymers are over 8% and 1.0 cm^2 V^（-1） s^（-1） *** this review,the recent progress of TPD-based copolymers in organic solar cells and organic transistors is summarized.

关键词： Donor-acceptor type copolymers organic semiconductors Thieno[3 4-c]pyrrole- 6-dione unit organic transistors organic solar cells

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Review and perspective of materials for flexible solar cells

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Materials Reports(Energy) 2021年第1期1卷 45-68页

作者： Xiaoyue Li Peicheng Li Zhongbin Wu Deying Luo Hong-Yu Yu Zheng-Hong Lu Department of Physics Center for Optoelectronics Engineering ResearchYunnan UniversityKunming650091PR China Department of Materials Science and Engineering University of TorontoTorontoOntarioM5G 3E4Canada School of Microelectronics Southern University of Science and TechnologyShenzhen518055PR China

Thin-film flexible solar cells are lightweight and mechanically *** with rapidly advancing battery technology,flexible solar panels are expected to create niche products that require lightweight,mechanical flexibility,and moldability into complex shapes,such as roof-panel for electric automobiles,foldable umbrellas,camping tents,*** this paper,we provide a comprehensive assessment of relevant materials suitable for making flexible solar *** materials reviewed include metals,ceramics,glasses,and *** active materials,we focus primarily on emerging new semiconductors including small organic donor/acceptor molecules,conjugated donor/acceptor polymers,and organometal halide *** electrode materials,transparent conducting oxides,thin metal films/nanowires,nanocarbons,and conducting polymers are *** also discuss the merits,weaknesses,and future perspectives of these materials for developing next-generation flexible photovoltaics.

关键词： Flexible solar cells Substrates Electrodes organic semiconductors Polymers Perovskites Silicon

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