电介质
介电谱
材料科学
有机半导体
有机太阳能电池
半导体
介电常数
极化子
凝聚态物理
化学物理
光电子学
聚合物
物理化学
复合材料
化学
物理
电极
量子力学
电子
电化学
作者
Michael P. Hughes,Katie D. Rosenthal,Niva A. Ran,Martin Seifrid,Guillermo C. Bazan,Thuc‐Quyen Nguyen
标识
DOI:10.1002/adfm.201801542
摘要
Abstract 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.
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