Band Structure Engineering in Organic Semiconductors

有机半导体的体积结构工程

• 批准号: 392969956
• 负责人: Professor Dr. Karl Leo
• 金额: --
• 依托单位: Professur für Optoelektronik
• 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 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/392969956?language=en
• 关键词: Band; Structure; Engineering; Organic; Semiconductors

Band structure engineering, i.e., the possibility to "tune" the band energies of semiconductors by mixing different elements, is a key technology for modern electronics and optoelectronics. In organic semiconductors, this approach seemed to be impossible since it requires delocalized electronic states - a situation which usually is not being observed in polycrystalline or amorphous organic thin films which are relevant for device applications. However, we have recently made the surprising observation that it is nevertheless possible to tune electronic energies in organic semiconductors by mixing molecular substituents: Long-range Coulomb interactions due to quadrupole moments of the molecules average the energies. This opens promising new perspectives for applications, such as the fine-tuning of open-circuit voltages in organic solar cells or emission wave lengths in organic light emitting diodes (OLED), or controlling the injection properties at contacts. In this project, we want to go far beyond the initial observations: We want to address key open questions, like the detailed interplay between local morphology and energy structure, the impact of molecular dipole moments on electronic energies, the effect of long-range interactions on energy level beyond the highest occupied orbitals, and many more. In parallel, the project also addresses first applications.

能带结构工程，即，通过混合不同的元素来“调谐”半导体的能带能量的可能性是现代电子学和光电子学的关键技术。在有机半导体中，这种方法似乎是不可能的，因为它需要离域电子态-这种情况通常不会在与器件应用相关的多晶或非晶有机薄膜中观察到。然而，我们最近做出了令人惊讶的观察，即通过混合分子取代基来调节有机半导体中的电子能量仍然是可能的：由于分子的四极矩而产生的长程库仑相互作用平均了能量。这为应用开辟了有希望的新前景，例如有机太阳能电池中开路电压或有机发光二极管（OLED）发射波长的微调，或控制接触处的注入特性。在这个项目中，我们希望远远超出最初的观察：我们希望解决关键的悬而未决的问题，例如局部形态和能量结构之间的详细相互作用、分子偶极矩对电子能量的影响、远程相互作用的影响对超出最高占据轨道的能级，等等。与此同时，该项目还涉及第一批应用程序。

项目成果

New charge-transfer states in blends of ZnPC with F8ZnPC

ZnPC 与 F8ZnPC 共混物中的新电荷转移态

• DOI: 10.1063/5.0037958
• 发表时间: 2021
• 期刊: AIP Advances
• 影响因子: 1.6
• 作者: L. Graf;K. Ortstein;L. P. Doctor;M. Naumann;J. Beyer;J. Heitmann;K. Leo;M. Knupfer
• 通讯作者: M. Knupfer

Dimers or Solid‐State Solvation? Intermolecular Effects of Multiple Donor–Acceptor Thermally Activated Delayed Fluorescence Emitter Determining Organic Light‐Emitting Diode Performance

• DOI: 10.1002/adom.202002153
• 发表时间: 2021-03
• 期刊: Advanced Optical Materials
• 影响因子: 9
• 作者: P. Imbrasas;R. Lygaitis;P. Kleine;R. Scholz;Christian Hänisch;S. Buchholtz;K. Ortstein;F. Talnack;S. Mannsfeld;Simone Lenk;S. Reineke

Energy Level Engineering in Organic Thin Films by Tailored Halogenation

通过定制卤化进行有机薄膜能级工程

• DOI: 10.1002/adfm.202002987
• 发表时间: 2020
• 期刊: Advanced Functional Materials
• 影响因子: 19
• 作者: K. Ortstein;S. Hutsch;A. Hinderhofer;J. Vahland;M. Schwarze;S. Schellhammer;M. Hodas;T. Geiger;H. Kleemann;F. Schreiber;H. Bettinger;F. Ortmann;K. Leo
• 通讯作者: K. Leo

Multimode Operation of Organic-Inorganic Hybrid Thin-Film Transistors Based on Solution-Processed Indium Oxide Films.

• DOI: 10.1021/acsami.1c10982
• 发表时间: 2021-09
• 期刊: ACS applied materials & interfaces
• 影响因子: 9.5
• 作者: Tianyu Tang;Jakob Zessin;F. Talnack;K. Haase;K. Ortstein;Baiqiang Li;M. Löffler;B. Rellinghaus;M. Hambsch;S. Mannsfeld