Evidence for Anisotropic Electronic Coupling of Charge Transfer States in Weakly Interacting Organic Semiconductor Mixtures.
Evidence for Anisotropic Electronic Coupling of Charge Transfer States in Weakly Interacting Organic Semiconductor Mixtures.
复制标题
DOI：
10.1021/jacs.7b01622
复制
发表时间：
2017-06
影响因子：
15
通讯作者：
V. Belova;P. Beyer;Eduard Meister;Theresa Linderl;M. Halbich;M. Gerhard;S. Schmidt;T. Zechel;Tino Meisel;A. Generalov;A. S. Anselmo;R. Scholz;O. Konovalov;A. Gerlach;M. Koch;A. Hinderhofer;A. Opitz;W. Brütting;F. Schreiber
中科院分区：
文献类型：
--
作者：
V. Belova;P. Beyer;Eduard Meister;Theresa Linderl;M. Halbich;M. Gerhard;S. Schmidt;T. Zechel;Tino Meisel;A. Generalov;A. S. Anselmo;R. Scholz;O. Konovalov;A. Gerlach;M. Koch;A. Hinderhofer;A. Opitz;W. Brütting;F. Schreiber
我们提出了一个全面的研究在弱相互作用的有机半导体混合物中的电荷转移（CT）效应。选择二烯二烯（DIP）和N，N'-双（2-乙基己基）-1,7-二氰二烯-3,4/9,10-双（二羧基亚胺）（PDIR-CN2）作为模型体系。为了表征分子间相互作用的结构、光学、电子和器件性质，使用了广泛的实验方法。通过详细的分析，我们证明了这种弱相互作用混合物中的部分CT对基态没有很强的影响，也不会产生杂化轨道。我们还发现在光吸收以及光致发光和电致发光中有很强的CT跃迁。通过使用不同的层序和组成，我们能够区分平面内和平面外的电子耦合，从而表征CT状态的各向异性。最后，我们讨论了CT激子产生对载流子输运和光电器件效率的影响。
We present a comprehensive investigation of the charge-transfer (CT) effect in weakly interacting organic semiconductor mixtures. The donor-acceptor pair diindenoperylene (DIP) and N,N'-bis(2-ethylhexyl)-1,7-dicyanoperylene-3,4/9,10-bis(dicarboxyimide) (PDIR-CN2) has been chosen as a model system. A wide range of experimental methods was used in order to characterize the structural, optical, electronic, and device properties of the intermolecular interactions. By detailed analysis, we demonstrate that the partial CT in this weakly interacting mixture does not have a strong effect on the ground state and does not generate a hybrid orbital. We also find a strong CT transition in light absorption as well as in photo- and electroluminescence. By using different layer sequences and compositions, we are able to distinguish electronic coupling in-plane vs out-of-plane and, thus, characterize the anisotropy of the CT state. Finally, we discuss the impact of CT exciton generation on charge-carrier transport and on the efficiency of photovoltaic devices.