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首页> 外文期刊>Advanced Functional Materials >Revealing the Impact of F4-TCNQ as Additive on Morphology and Performance of High-Efficiency Nonfullerene Organic Solar Cells
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Revealing the Impact of F4-TCNQ as Additive on Morphology and Performance of High-Efficiency Nonfullerene Organic Solar Cells

机译：揭示F4-TCNQ作为添加剂对高效非富勒烯有机太阳能电池的形态和性能的影响

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摘要

Fluorinated molecule 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) and its derivatives have been used in polymer:fullerene solar cells primarily as a dopant to optimize the electrical properties and device performance. However, the underlying mechanism and generality of how F4-TCNQ affects device operation and possibly the morphology is poorly understood, particularly for emerging nonfullerene organic solar cells. In this work, the influence of F4-TCNQ on the blend film morphology and photovoltaic performance of nonfullerene solar cells processed by a single halogen-free solvent is systematically investigated using a set of morphological and electrical characterizations. In solar cells with a high-performance polymer:small molecule blend FTAZ:IT-M, F4-TCNQ has a negligibly small effect on the molecular packing and surface characteristics, while it clearly affects the electronic properties and mean-square composition variation of the bulk. In comparison to the control devices with an average power conversion efficiency (PCE) of 11.8%, inclusion of a trace amount of F4-TCNQ in the active layer has improved device fill factor and current density, which has resulted into a PCE of 12.4%. Further increase in F4-TCNQ content degrades device performance. This investigation aims at delineating the precise role of F4-TCNQ in nonfullerene bulk heterojunction films, and thereby establishing a facile approach to fabricate highly optimized nonfullerene solar cells.
机译：氟化分子2,3,5,6-四氟-7,7,8,8-四氰基喹二甲烷（F4-TCNQ）及其衍生物已用于聚合物：富勒烯太阳能电池中，主要用作掺杂剂以优化电性能和器件性能。然而，对于F4-TCNQ如何影响器件操作以及可能的形态的潜在机理和一般性了解甚少，尤其是对于新兴的非富勒烯有机太阳能电池而言。在这项工作中，使用一组形态学和电学特征，系统地研究了F4-TCNQ对由单一无卤溶剂处理的非富勒烯太阳能电池的共混膜形态和光伏性能的影响。在具有高性能聚合物：小分子共混物FTAZ：IT-M的太阳能电池中，F4-TCNQ对分子堆积和表面特性的影响可忽略不计，同时明显影响其电子性能和均方组成变化块。与平均功率转换效率（PCE）为11.8％的控制设备相比，在有源层中包含痕量F4-TCNQ可以改善设备填充率和电流密度，从而使PCE达到12.4％ 。 F4-TCNQ含量的进一步增加会降低设备性能。这项研究旨在描绘F4-TCNQ在非富勒烯本体异质结薄膜中的确切作用，从而建立一种制造高度优化的非富勒烯太阳能电池的简便方法。

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