在钙钛矿太阳能电池中介导20%功率转换效率的无掺杂剂分子空穴传输材料
Dopant-free molecular hole transport material that mediates a 20% power conversion efficiency in a perovskite solar cell
摘要：
有机分子空穴传输材料（HTM）对于钙钛矿太阳能电池（PSC）的可规模化制造是有吸引力的，因为它们比聚合物和无机HTM更容易以高纯度重复制备。还需要在没有掺杂剂和添加剂的情况下构建PSC，以避免令人生畏的工程和稳定性问题。我们在这里报告的功率转换效率（PCE）为20.6%的分子HTM在倒置（p-i-n）PSC没有任何掺杂剂或夹层。这一新的基准是通过以下发现而成为可能的：退火含有氧化还原活性三苯胺（TPA）单元的螺基无掺杂剂HTM（表示为DFH）经历垂直于基底的优先分子组织。这种结构顺序由DFH二氧六环基团的强分子间相互作用决定，提供了高的固有空穴迁移率（1 × 10 -3 cm 2 V-1 s-1）。DFH的退火膜还使得能够生长大的钙钛矿晶粒（高达2 μ m），其使PSC中的电荷复合最小化。DFH也可以以任何其他有机HTM的一小部分成本分离。
英文摘要：
Organic molecular hole-transport materials (HTMs) are appealing for the scalable manufacture of perovskite solar cells (PSCs) because they are easier to reproducibly prepare in high purity than polymeric and inorganic HTMs. There is also a need to construct PSCs without dopants and additives to avoid formidable engineering and stability issues. We report here a power conversion efficiency (PCE) of 20.6% with a molecular HTM in an inverted (p-i-n) PSC without any dopants or interlayers. This new benchmark was made possible by the discovery that annealing a spiro-based dopant-free HTM (denoted DFH) containing redox-active triphenyl amine (TPA) units undergoes preferential molecular organization normal to the substrate. This structural order, governed by the strong intermolecular interactions of the DFH dioxane groups, affords high intrinsic hole mobility (1x10-3 cm2 V-1 s-1). Annealing films of DFH also enables the growth of large perovskite grains (up to 2 um) that minimize charge recombination in the PSC. DFH can also be isolated at a fraction of the cost of any other organic HTM.
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