Abstract We demonstrated a simple and effective processing protocol to improve the electrical conductivity of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films via post-treatment with an alcohol-based solvent, 2-chloroethanol (2-CE), and to enhance their performance as a transparent anode in organic photovoltaic cells (OPVs). Owing to its moderate boiling point, in contrast to previously reported chemicals, 2-CE is advantageous both for handling as a liquid-phase chemical and for drying from the films via evaporation. We compared the optical and electrical properties of the 2-CE-treated PEDOT:PSS with those of standard PEDOT:PSS-based electrodes with the addition of 5 vol% dimethyl sulfoxide (DMSO). With a similar thickness and transmittance in the visible region, the 2-CE-treated polymer electrodes outperformed the DMSO-added films with regard to the electrical conductivity (762 S cm−1 vs. 439 S cm−1). The work functions were almost identical: ∼5 eV. We fabricated and characterized organic photovoltaic devices using the anodes and polymer:fullerene blends and found that the 2-CE treatment resulted in higher device performance. Additionally, the 2-CE treatment was applicable to OPVs on a flexible plastic substrate, indicating the effectiveness of the proposed protocol.

中文翻译：

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高导电性 PEDOT:PSS 电极通过酒精溶剂后处理获得，用于无 ITO 有机太阳能电池

摘要 我们展示了一种简单有效的处理方案，通过用醇基溶剂 2-氯乙醇进行后处理来提高聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）薄膜的电导率（ 2-CE)，并提高它们作为有机光伏电池 (OPV) 中透明阳极的性能。由于其沸点适中，与先前报道的化学品相比，2-CE 有利于作为液相化学品处理和通过蒸发从薄膜中干燥。我们比较了 2-CE 处理的 PEDOT:PSS 与标准 PEDOT:PSS 电极的光学和电学特性，并添加了 5 vol% 二甲基亚砜 (DMSO)。在可见光区具有相似的厚度和透射率，2-CE 处理的聚合物电极在电导率方面优于添加 DMSO 的薄膜（762 S cm-1 与 439 S cm-1）。功函数几乎相同：~5 eV。我们使用阳极和聚合物：富勒烯混合物制造并表征了有机光伏器件，发现 2-CE 处理导致更高的器件性能。此外，2-CE 处理适用于柔性塑料基板上的 OPV，表明所提议的协议的有效性。