Triplet concepts for organic photovoltaics: new materials, devices and mechanisms

有机光伏的三重概念：新材料、器件和机制

• 批准号: 392306670
• 负责人: Professorin Dr. Anna Köhler, since 4/2019
• 金额: --
• 依托单位: National Natural Science Foundation of China
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/392306670?language=en
• 关键词: Triplet; concepts; organic; photovoltaics; new

This collaborative research is aimed to explore high efficiency organic photovoltaic materials and devices where triplet states play a crucial role. In current state-of-the-art organic photovoltaics triplet states and charge transfer triplet states have only rarely been considered to improve device efficiencies. Most bulk heterojunction solar cells rely on the photogeneration of singlet excited states, which form singlet charge transfer states at the donor/acceptor interface and may separate into free charges. Limiting factors are for example the small exciton diffusion length or further recombination processes at the donor-acceptor interface. In order to address those factors, this project aims to gain a fundamental understanding in the utilization of triplet mechanisms and their application in high efficiency photovoltaics. Novel triplet active components and high efficiency conjugated organic photovoltaic materials will be synthesized. The latter may provide a broad and strong optical absorption, suitable highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) energy levels and high charge mobility. Furthermore, these materials will be used to investigate the photophysics of different concepts that utilize triplet states in detail. These include donor/acceptor blends with heavy metal complexed dopants as well as donor materials that carry incorporated heavy metal complexes to directly access triplet states. For example, recombination should be slowed down or avoided and hence charge generation enhanced, if the charge transfer triplet states can be efficiently accessed and triplet levels of respective donor materials are sufficiently high. New materials will be developed, theoretical calculated and synthesized by Prof. Tao, Nanjing Tech and the structural, nanomorphological and opto-electronic properties will be investigated by Prof. Huettner, Universtät Bayreuth, providing complementary advantages of materials synthesis and device physics between the two research groups. With this collaborative research we hope to shine new light into long asked questions of the role of triplets in organic photovoltaics. Furthermore, it is expected to discover new phenomena as well as raise new questions in the field of organic solar cells and provide guidelines for the further design rules of new photovoltaic materials.

这项合作研究旨在探索三线态发挥关键作用的高效有机光伏材料和器件。在当前最先进的有机光伏器件中，很少考虑使用三重态和电荷转移三重态来提高器件效率。大多数本体异质结太阳能电池依赖于单线态激发态的光生，其在供体/受体界面处形成单线态电荷转移态并且可以分离成自由电荷。限制因素例如是小的激子扩散长度或供体-受体界面处的进一步复合过程。为了解决这些因素，该项目旨在对三重态机制的利用及其在高效光伏发电中的应用有一个基本的了解。将合成新型三重态活性组分和高效共轭有机光伏材料。后者可以提供宽且强的光学吸收、合适的最高占据分子轨道(HOMO)/最低未占据分子轨道(LUMO)能级和高电荷迁移率。此外，这些材料将用于详细研究利用三重态的不同概念的光物理学。这些包括与重金属络合掺杂剂的供体/受体混合物以及携带掺入的重金属络合物以直接获得三线态的供体材料。例如，如果可以有效地获得电荷转移三重态并且相应施主材料的三重态能级足够高，则应当减慢或避免复合，从而增强电荷产生。新材料将由南京工业大学陶教授进行开发、理论计算和合成，结构、纳米形貌和光电性能将由拜罗伊特大学Huettner教授进行研究，实现两个研究组在材料合成和器件物理方面的优势互补。通过这项合作研究，我们希望为有机光伏中三元组的作用这一长期被问到的问题提供新的线索。此外，有望在有机太阳能电池领域发现新现象、提出新问题，为新型光伏材料的进一步设计规则提供指导。

项目成果

The Impact of Solvent Vapor on the Film Morphology and Crystallization Kinetics of Lead Halide Perovskites during Annealing.

• DOI: 10.1021/acsami.1c09075
• 发表时间: 2021-09
• 期刊: ACS applied materials & interfaces
• 影响因子: 9.5
• 作者: Yu Zhong;D. Seeberger;E. Herzig;A. Köhler;Fabian Panzer;Cheng Li;S. Huettner

Investigating two-step MAPbI3 thin film formation during spin coating by simultaneous in situ absorption and photoluminescence spectroscopy

• DOI: 10.1039/c9ta12409h
• 发表时间: 2020-03-14
• 期刊: JOURNAL OF MATERIALS CHEMISTRY A
• 影响因子: 11.9
• 作者: Chauhan, Mihirsinh;Zhong, Yu;Panzer, Fabian
• 通讯作者: Panzer, Fabian

Short-Axis Methyl Substitution Approach on Indacenodithiophene: A New Multi-Fused Ladder-Type Arene for Organic Solar Cells

茚并二噻吩的短轴甲基取代方法：一种用于有机太阳能电池的新型多稠合梯型芳烃

• DOI: 10.3389/fchem.2019.00372
• 发表时间: 2019-06
• 期刊: Frontiers in Chemistry
• 影响因子: 5.5
• 作者: Li Yun;Wang Menghan;Wu Fupeng;Gao Xuyu;Huettner Sven;Tao Youtian;Jiang Zuo-Quan
• 通讯作者: Jiang Zuo-Quan

Thermally Activated Delayed Fluorescent Dendrimers that Underpin High‐Efficiency Host‐Free Solution‐Processed Organic Light‐Emitting Diodes

• DOI: 10.1002/adma.202110344
• 发表时间: 2022-04
• 期刊: Advanced Materials
• 影响因子: 29.4
• 作者: Dianming Sun;Eimantas Duda;Xiaochun Fan;Rishabh Saxena;M. Zhang;S. Bagnich;Xiaohong Zhang;A. Köhler;E. Zysman‐Colman

A cyclometalating organic ligand with an Iridium center toward dramatically improved photovoltaic performance in organic solar cells.

• DOI: 10.1039/c9cc00173e
• 发表时间: 2019-02
• 期刊: Chemical communications
• 影响因子: 4.9
• 作者: Qingjing Wu;Yang Cheng;Zhongyuan Xue;Xuyu Gao;Menghan Wang;Wenbo Yuan;S. Huettner;Shigang Wan;Xudong Cao;Youtian Tao;Wei Huang