Aqueous Soluble Fullerene Acceptors for Efficient Eco-Friendly Polymer Solar Cells Processed from Benign Ethanol/Water Mixtures,Chemistry of Materials

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Aqueous Soluble Fullerene Acceptors for Efficient Eco-Friendly Polymer Solar Cells Processed from Benign Ethanol/Water Mixtures
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-07-27 00:00:00 , DOI: 10.1021/acs.chemmater.8b02086
Youngkwon Kim ₁ , Joonhyeong Choi ₁ , Changyeon Lee ₁ , Youngwoong Kim ₁ , Changkyun Kim ₁ , Thanh Luan Nguyen ₂ , Bhoj Gautam ₃ , Kenan Gundogdu ₄ , Han Young Woo ₂ , Bumjoon J. Kim ₁

Affiliation

We present a new series of fullerene derivatives that exhibit solubility in ethanol/water solvent mixtures and implement these materials to fabricate polymer solar cells (PSCs) using environmentally benign solvents. In order to simultaneously optimize the processability of the fullerenes in ethanol/water solvent mixtures and device performance, different fullerene mono-adducts were designed by introducing oligoethylene glycol side chains with different lengths and number of branches. As a result, we achieved power conversion efficiencies up to 1.4% for PSCs processed from benign ethanol/water mixtures in air. Significantly, the new alcohol/water-soluble fullerene derivatives displayed electron mobilities up to 1.30 × 10^–4 cm² V^–1 s^–1, 150 times higher than those of a previously reported alcohol-soluble fullerene bis-adduct, owing to efficient packing of the fullerenes. Femtosecond transient absorption spectroscopy revealed the acceptor side chain to markedly impact geminate and/or nongeminate charge recombination in the PSCs. In addition, side chain optimization of these fullerenes produced well-intermixed morphologies with high domain purity when blended with p-type polymer to provide hole and electron transport pathways. Our results provide important guidelines for the design of electroactive materials for safe and environmentally benign fabrication of PSCs and other organic electronic devices.

中文翻译：

水溶性富勒烯受体，用于从良乙醇/水混合物加工的高效生态友好型聚合物太阳能电池

我们提出了一系列新的富勒烯衍生物，它们在乙醇/水溶剂混合物中表现出溶解性，并使用环境友好的溶剂实施这些材料来制造聚合物太阳能电池（PSC）。为了同时优化富勒烯在乙醇/水溶剂混合物中的可加工性和装置性能，通过引入具有不同长度和分支数的低聚乙二醇侧链来设计不同的富勒烯单加合物。结果，对于由空气中良性乙醇/水混合物处理的PSC，我们实现了高达1.4％的功率转换效率。重要的是，新的醇/水溶性富勒烯衍生物显示出的电子迁移率高达1.30×10 ^–4 cm ² V ^–1 s ^–1，由于富勒烯的有效包装，比以前报道的醇溶性富勒烯双加合物高150倍。飞秒瞬态吸收光谱显示，受体侧链显着影响PSC中的发芽和/或非发芽电荷重组。此外，这些富勒烯的侧链优化在与p型聚合物共混以提供空穴和电子传输途径时，产生了具有高域纯度的良好混合的形态。我们的结果为电活性材料的设计提供了重要的指导方针，以安全，环保地生产PSC和其他有机电子设备。

更新日期：2018-07-27

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