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首页> 外文期刊>Advanced Functional Materials >Charge Photogeneration in Non-Fullerene Organic Solar Cells: Influence of Excess Energy and Electrostatic Interactions
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Charge Photogeneration in Non-Fullerene Organic Solar Cells: Influence of Excess Energy and Electrostatic Interactions

机译：非富烯烯有机太阳能电池中的电荷荧光：过量能量和静电相互作用的影响

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In organic solar cells, photogenerated singlet excitons form charge transfer (CT) complexes, which subsequently split into free charge carriers. Here, the contributions of excess energy and molecular quadrupole moments to the charge separation process are considered. The charge photogeneration in two separate bulk heterojunction systems consisting of the polymer donor PTB7-Th and two non-fullerene acceptors, ITIC and h-ITIC, is investigated. CT state dissociation in these donor-acceptor systems is monitored by charge density decay dynamics obtained from transient absorption experiments. The electric field dependence of charge carrier generation is studied at different excitation energies by time delayed collection field (TDCF) and sensitive steady-state photocurrent measurements. Upon excitation below the optical gap, free charge carrier generation becomes less field dependent with increasing photon energy, which challenges the view of charge photogeneration proceeding through energetically lowest CT states. The average distance between electron-hole pairs at the donor-acceptor interface is determined from empirical fits to the TDCF data. The delocalization of CT states is larger in PTB7-Th:ITIC, the system with larger molecular quadrupole moment, indicating the sizeable effect of the electrostatic potential at the donor-acceptor interface on the dissociation of CT complexes.
机译：在有机太阳能电池中，光生成的单态激子形成电荷转移（CT）配合物，随后分为自由电荷载体。在此，考虑了过量能量和分子四极其矩对电荷分离过程的贡献。研究了由聚合物供体PTB7-和两种非富勒烯受体，Itic和H-Itic组成的两个单独的散装异质结系统中的电荷光源。通过从瞬态吸收实验获得的电荷密度衰减动态监测这些供体受体系统中的CT状态解离。通过时间延迟收集场（TDCF）和敏感稳态光电流测量在不同的激励能量下研究了电荷载流子生成的电场依赖性。在低于光学间隙的激发时，自由电荷载流子产生与增加的光子能量依赖于较低的场，这挑战了通过能量最低的CT状态进行的电荷光源的视图。施主接口处的电子 - 空穴对之间的平均距离由经验拟合到TDCF数据确定。 PTB7-TN的临床化在PTB7-TH中的临床化：ITIC，具有较大分子四极矩阵的系统，表明静电势在供体 - 受体界面上的静电电位对CT复合物解离的相当大。

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