Correlated magnetic field effects on carriers and excitons in single-carrier exciplex-based organic photodiodes
Correlated magnetic field effects on carriers and excitons in single-carrier exciplex-based organic photodiodes
复制标题
相关磁场对单载流子激基复合物有机光电二极管中载流子和激子的影响
DOI：
10.1039/c9cp05178c
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发表时间：
2019
影响因子：
3.3
通讯作者：
Ma Dongge
中科院分区：
文献类型：
--
作者：
Yuan Peisen;Guo Xiaomin;Qiao Xianfeng;Ma Dongge
非磁性有机半导体（OMFEs）在分析有机光电二极管的动态过程时，由于其线形具有指纹特征，磁场效应越来越受到人们的关注。然而，载流子和激子上omfe的起源和相互关系仍然是目前研究人员面临的主要挑战。在这项研究中，我们战略性地设计了基于激子的单载流子器件，以有效地分离载流子和激子，并研究它们的omfe和关系。研究发现，光照作用下明显的正磁导率（MC）不仅与电荷转移态（CT）激子的形成有关，还与光产生激子的解离载流子与注入载流子之间的二次复合过程有关。此外，暗条件下出现负MC，反映了本征磁场对载流子输运的影响。通过测量入射波长相关的光致MC和激子光致发光（MPL），进一步研究了激子和载流子与OMFEs的关系。这两种薄膜表现出相似的振幅依赖曲线，这是由它们的供体-受体吸收特性造成的。此外，该装置所表现出的强三极化子湮灭（TPA）过程提供了不同振幅相关的光诱导MCs。
Magnetic field effects in nonmagnetic organic semiconductors (OMFEs) are attracting increasing attention because of the fingerprint characteristics of their line shapes when they are used to analyze the dynamic processes of organic photodiodes. However, the origin and correlation of OMFEs on carriers and excitons are currently still major challenges for researchers. In this study, we strategically designed exciplex-based single-carrier devices to effectively separate carriers and excitons and investigate their OMFEs and relationships. It is found that the obvious positive magneto-conductance (MC) with illumination is not only related to the formation of charge transfer state (CT) excitons, but is also caused by the secondary recombination process between dissociated carriers from the photo-generated excitons and the injected carriers. Moreover, a negative MC appears under dark conditions, reflecting the intrinsic magnetic field effects on carrier transport. The relationships of the OMFEs with the excitons and carriers were further studied by measuring the incident-wavelength dependent photo-induced MC and the magneto-photoluminescence (MPL) of the exciplex films. The two films show similar amplitude-dependent curves, which are contributed by their donor–acceptor absorption properties. Moreover, the strong triplet-polaron annihilation (TPA) processes exhibited in this device afford different amplitude-dependent photo-induced MCs.