Dynamics of photoexcited charge carriers in self-organized organic bulk semiconductors

自组织有机体半导体中光激发载流子的动力学

• 批准号: 220464899
• 负责人: Professor Dr. Vladimir Dyakonov
• 金额: --
• 依托单位: Lehrstuhl für Experimentelle Physik VI
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/220464899?language=en
• 关键词: Dynamics; photoexcited; charge; carriers; self

The overall project goal is to develop a fundamental understanding of the influence of molecular order on the dynamics of the processes, occurring in molecular bulk semiconductors with variable architecture, along the whole process chain, from light absorption to charge carrier transport. For organic bulk semiconductors, both local and macroscopic mobilities are of importance. The former reflects the potential of the material itself, the second is the essential parameter for device applications. Ideally, one needs to know the whole picture to recognize the application potential of any newly developed material and to deliver feedback on its optimisation: either of the material itself (in case of low local mobility) or of the device under test (macroscopic mobility by far lower than local mobility). In the next project phase, we will apply the method of transient microwave conductivity (TRMC) for selected materials, polymers and oligomers, provided by the FOR 1809 partners, to investigate their microscopic transport properties. TRMC is based on the fact that charge carriers, generated by a light pulse, lead to dielectric losses in the material under study (microwave absorption). A quantitative analysis of TRMC measurements, however, is only possible, if the charge carrier density is known. Therefore, measurement of the microwave response should ideally be done together with measurements of optical density via, e.g. transient absorption (TA) under the same conditions. In the first funding period we succeeded in the construction of a combined set-up, which allows, to carry out both TRMC and TA simultaneously, on the same sample during the same laser excitation pulse, while even including a cryostat for temperature-dependent measurements. We will use this method to systematically study macromolecules based on squaraine conjugates. In contrast to that, indolenine-squaraines can be produced specifically in the form of stretched zig-zag or helical polymer structures. Therefore it is interesting to investigate the influence of the superstructure on the local charge carrier transport. Further, we plan to perform TA/TRMC studies on hierarchical perylenbisimide derivates, forming Jaggregates, which are liquid crystalline in bulk, but may also form aggregates in liquid solution. Again, it will be interesting to find the influence of the aggregate state on local charge dynamics and transport properties. To address the macroscopic conductivity properties of photovoltaic devices, we will perform transient conductivity measurements, such as OTRACE, TDCF, ToF, TPV/TPC. Theoretical analysis will be done in collaboration with the theory partners within the research group.

总体项目目标是对分子顺序对过程动力学的影响进行基本理解，该过程发生在分子体积的半导体中，沿整个过程链，从光吸收到电荷载体传输。对于有机散装半导体，局部和宏观的迁移率都很重要。前者反映了材料本身的潜力，第二个是设备应用的基本参数。理想情况下，人们需要了解整个情况，以识别任何新开发的材料的应用潜力并就其优化提供反馈：材料本身（如果局部移动性较低）或正在测试的设备（宏观迁移率远低于本地移动性）。在下一个项目阶段，我们将应用瞬态微波电导率（TRMC）的方法，用于由1809年合作伙伴提供的选定材料，聚合物和低聚物，以研究其微观运输特性。 TRMC基于以下事实：通过光脉冲产生的荷载体导致所研究材料（微波吸收）的介电损失。但是，只有在已知电荷载体密度的情况下，只有对TRMC测量的定量分析才有可能。因此，理想情况下，应与光密度的测量通过，例如在相同条件下的瞬态吸收（TA）。在第一个资金期间，我们成功地构建了合并的设置，该设置允许在同一激光激发脉冲期间同时在同一样品上同时执行TRMC和TA，同时甚至包括用于温度依赖温度测量的低温恒温器。我们将使用这种方法来系统地研究基于方形缀合物的大分子。与此相反，可以专门以拉伸的曲折或螺旋聚合物结构的形式生产吲哚汀平方英。因此，研究上层建筑对局部电荷载体运输的影响很有趣。此外，我们计划对分层perylenbisimide进行TA/TRMC研究，形成批量液晶的jaggregates，但也可能在液体溶液中形成聚集体。同样，找到骨料状态对局部电荷动力和运输属性的影响将很有趣。为了解决光伏设备的宏观电导率特性，我们将执行瞬时电导率测量值，例如Otrace，TDCF，TOF，TOF，TPV/TPC。理论分析将与研究小组中的理论合作伙伴合作进行。

项目成果

Singlet Exciton Diffusion in Organic Crystals Based on Marcus Transfer Rates.

• DOI: 10.1021/ct500014h
• 发表时间: 2014-02
• 期刊: Journal of chemical theory and computation
• 影响因子: 5.5
• 作者: V. Stehr;R. Fink;B. Engels;J. Pflaum;C. Deibel

Direct Observation of Spin States Involved in Organic Electroluminescence Based on Thermally Activated Delayed Fluorescence

基于热激活延迟荧光直接观察有机电致发光中涉及的自旋态

• DOI: 10.1002/adom.201600926
• 发表时间: 2017
• 期刊: Advanced Optical Materials
• 影响因子: 9
• 作者: S. Väth;K. Tvingstedt;M. Auth;A. Sperlich;A. Dabuliene;J. V. Grazulevicius;P. Stakhira;V. Cherpak;V. Dyakonov
• 通讯作者: V. Dyakonov

Photophysics of Deep Blue Acridane- and Benzonitrile-Based Emitter Employing Thermally Activated Delayed Fluorescence

• DOI: 10.1021/acs.jpcc.8b08716
• 发表时间: 2018-10-04
• 期刊: JOURNAL OF PHYSICAL CHEMISTRY C
• 影响因子: 3.7
• 作者: Drigo, Nikita A.;Kudriashova, Liudmila G.;Dyakonov, Vladimir
• 通讯作者: Dyakonov, Vladimir

Anisotropy of singlet exciton diffusion in organic semiconductor crystals from ab initio approaches.

• DOI: 10.1063/1.4858464
• 发表时间: 2014-01
• 期刊: The Journal of chemical physics
• 作者: V. Stehr;B. Engels;C. Deibel;R. Fink

Effects of characteristic length scales on the exciton dynamics in rubrene single crystals

• DOI: 10.1103/physrevb.90.205305
• 发表时间: 2014-11-17
• 期刊: PHYSICAL REVIEW B
• 影响因子: 3.7
• 作者: Gieseking, Bjoern;Schmeiler, Teresa;Pflaum, Jens
• 通讯作者: Pflaum, Jens