Abstract Although the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs) has made remarkable progress in the past decade, so far, a series of problems caused by dye aggregation is still a considerable challenge. To solve this problem, we designed two linear coplanar aromatic compounds with multiple flexible chains, 511-dihydroindeno[1,2-b]carbazole and 612-dihydroindeno[1,2-b]fluorene as the donor units. The research focuses on the accurate evaluation of the key factors affecting dye aggregation and charge recombination, including co-adsorption experiment, electronic impedance test, and open-circuit voltage decay (OCVD) test. The results show that the introduction of multiple alkyl groups into the donor framework helps to control dye aggregation to reduce exciton quenching, and helps to passivate the surface of TiO2 to promote the delay of charge recombination. The open-circuit voltage (Voc) of both ZS01 and ZS02-based DSSCs exceeds 700 mV, which indicates that the linear unit modified by alkyl is expected to be a strong candidate for high-efficiency sensitizer and also provides a new idea for the design of the donor moiety.

中文翻译：

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用于染料敏化太阳能电池的具有多个柔性链的线性供体：抑制染料聚集和电荷复合

摘要 尽管染料敏化太阳能电池（DSSCs）的功率转换效率（PCE）在过去十年取得了显着进步，但迄今为止，染料聚集引起的一系列问题仍然是一个相当大的挑战。为了解决这个问题，我们设计了两种具有多个柔性链的线性共面芳族化合物，511-二氢茚并[1,2-b]咔唑和612-二氢茚并[1,2-b]芴作为供体单元。研究重点是准确评估影响染料聚集和电荷复合的关键因素，包括共吸附实验、电子阻抗测试和开路电压衰减（OCVD）测试。结果表明，在供体骨架中引入多个烷基有助于控制染料聚集以减少激子猝灭，有助于钝化二氧化钛表面，促进电荷复合延迟。ZS01和ZS02基DSSCs的开路电压（Voc）均超过700 mV，表明烷基修饰的线性单元有望成为高效敏化剂的有力候选者，也为设计提供了新思路供体部分。