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High-Efficiency and Stable Organic Solar Cells Enabled by Dual Cathode Buffer Layers

机译：双阴极缓冲层的高效率和稳定的有机太阳能电池

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摘要

Various cathode interface materials have been used in organic solar cells (OSCs) to realize high performance. However, most cathode interface materials have their respective weaknesses in maximizing the efficiency or stability of OSCs. Herein, three kinds of alcohol-soluble cathode interfacial materials are combined with bathocuproine (BCP) to serve as multifunctional bilayer cathode buffers for the regular OSCs, and thus greatly enhanced power conversion efficiencies over 10.11% and significantly improved device stability have been achieved. By utilizing double interlayers, both light absorption and light distribution in active layer are improved. Furthermore, double interlayers offer favorable energy-level alignment, alcohol treatment, and duplicate protection of active layer, resulting in significantly reduced leakage current, suppressed recombination, and efficient charge collection. The improved device stability is related to the blocking effect of the complex formed between BCP and the metal electrode and the additional protection effect of the underlying alcohol-soluble materials. In view of the universal use of alcohol-soluble organic electrolyte as cathode buffer layers and by courtesy of the superiority of the double cathode layers relative to the monolayer controls, the double interlayer strategy demonstrated here opens a new way to fully exploiting the potential of OSCs and is believed to be extended to a wider application.
机译：各种阴极接口材料已用于有机太阳能电池（OSC）以实现高性能。然而，大多数阴极接口材料具有它们各自的弱点，最大化OSC的效率或稳定性。这里，三种醇可溶性阴极界面材料与浴室（BCP）组合用作常规OSC的多功能双层阴极缓冲器，因此实现了超过10.11％的功率转换效率，并且已经实现了显着提高的装置稳定性。通过利用双相层，有源层的光吸收和光分布都得到改善。此外，双层间层间提供有利的能量水平对准，醇类处理和对有源层的重复保护，导致漏电流显着降低，重组和有效的充电收集。改进的装置稳定性与在BCP和金属电极之间形成的复合物的阻断效果以及底层醇溶性材料的附加保护作用。鉴于普遍使用酒精可溶性有机电解质作为阴极缓冲层并且通过相对于单层控制的双阴极层的优越性，这里显示的双层策略开辟了充分利用OSC的潜力的新方法被认为扩展到更广泛的应用程序。

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