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Determining the Dielectric Constants of Organic Photovoltaic Materials Using Impedance Spectroscopy

机译：使用阻抗光谱法测定有机光伏材料的介电常数

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1801542.1-1801542.11%The photovoltaic and electrical properties of organic semiconductors are characterized by their low dielectric constant, which leads to the formation of polarons and Frenkel excitons. The low dielectric constant of organic semiconductors has been suggested to be significantly influential in geminate and bimolecular recombination losses in organic photovoltaics (OPVs). However, despite the critical attention that the dielectric constant has received in literature discussions, there has not yet been a thorough study of the dielectric constant in common organic semiconductors and how it changes when blended. In fact, there have been some inconsistent and contradictory reports on such dielectric constants, making it difficult to identify trends. Herein, at first a detailed explanation of a specific methodology to determine the dielectric constant in OPV materials with impedance spectroscopy is provided, including guidelines for possible experimental pitfalls. Using this methodology, the analysis for the dielectric constant of 17 common neat organic semiconductors is carried out. Furthermore, the relationship between the dielectric constant and blend morphology are studied and determined. It is found that the dielectric constant of a blend system can be very accurately predicted solely based on the dielectric constants of the neat materials, scaled by their respective weight ratios in the blend film.
机译：1801542.1-1801542.11 %%有机半导体的光伏和电特性的特征在于其低介电常数，这导致形成极化子和Frenkel激子。已经提出，有机半导体的低介电常数在有机光伏（OPV）中对发芽和双分子重组损失有显着影响。然而，尽管在文献讨论中介电常数受到了极大的关注，但尚未对普通有机半导体中的介电常数及其在混合时如何变化进行深入研究。实际上，已经有关于这种介电常数的一些不一致和矛盾的报道，这使得很难确定趋势。在本文中，首先提供了使用阻抗谱确定OPV材料中介电常数的特定方法的详细说明，包括可能的实验陷阱的指南。使用这种方法，对17种普通纯有机半导体的介电常数进行了分析。此外，研究和确定介电常数与共混物形态之间的关系。已经发现，仅基于纯净材料的介电常数，就可以根据混合膜中它们各自的重量比来缩放，从而可以非常准确地预测混合系统的介电常数。

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