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首页> 外文期刊>Advanced energy materials >New Generation Hole Transporting Materials for Perovskite Solar Cells: Amide-Based Small-Molecules with Nonconjugated Backbones
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New Generation Hole Transporting Materials for Perovskite Solar Cells: Amide-Based Small-Molecules with Nonconjugated Backbones

机译：钙钛矿太阳能电池的新一代空穴传输材料：具有非共轭骨架的基于酰胺的小分子

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摘要

State-of-the-art perovskite-based solar cells employ expensive, organic hole transporting materials (HTMs) such as Spiro-OMeTAD that, in turn, limits the commercialization of this promising technology. Herein an HTM (EDOT-Amide-TPA) is reported in which a functional amide-based backbone is introduced, which allows this material to be synthesized in a simple condensation reaction with an estimated cost of $5 g(-1). When employed in perovskite solar cells, EDOT-Amide-TPA demonstrates stabilized power conversion efficiencies up to 20.0% and reproducibly outperforms Spiro-OMeTAD in direct comparisons. Time resolved microwave conductivity measurements indicate that the observed improvement originates from a faster hole injection rate from the perovskite to EDOT-Amide-TPA. Additionally, the devices exhibit an improved lifetime, which is assigned to the coordination of the amide bond to the Li-additive, offering a novel strategy to hamper the migration of additives. It is shown that, despite the lack of a conjugated backbone, the amide-based HTM can outperform state-of-the-art HTMs at a fraction of the cost, thereby providing a novel set of design strategies to develop new, low-cost HTMs.
机译：基于钙钛矿的先进太阳能电池采用了昂贵的有机空穴传输材料（HTM），例如Spiro-OMeTAD，这反过来限制了这一有前途的技术的商业化。本文报道了一种HTM（EDOT-Amide-TPA），其中引入了基于酰胺的功能性骨架，这使得该材料可以通过简单的缩合反应合成，估计成本低于$ 5 g（-1）。当用于钙钛矿太阳能电池中时，EDOT-Amide-TPA在直接比较中显示出高达20.0％的稳定功率转换效率，并且可再现地优于Spiro-OMeTAD。时间分辨的微波电导率测量表明，观察到的改善源自钙钛矿到EDOT-Amide-TPA的更快的空穴注入速率。此外，这些器件还具有更长的使用寿命，这归因于酰胺键与锂添加剂的配位，从而提供了一种新颖的策略来阻止添加剂的迁移。结果表明，尽管缺少共轭主链，但基于酰胺的HTM可以以一小部分的成本胜过最新的HTM，从而提供了一套新颖的设计策略来开发新的低成本HTM。

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