Supramolecular Halogen Bond Passivation of Organic-Inorganic Halide Perovskite Solar Cells
Supramolecular Halogen Bond Passivation of Organic-Inorganic Halide Perovskite Solar Cells
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DOI：
10.1021/nl500627x
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发表时间：
2014-06-01
期刊：
影响因子：
10.8
通讯作者：
Snaith, Henry J.
中科院分区：
文献类型：
--
作者：
Abate, Antonio;Saliba, Michael;Snaith, Henry J.
有机-无机卤化物钙钛矿，如CH 3 NH3 PbX 3（X = I-，Br-，Cl-），正吸引越来越多的兴趣来制备低成本的太阳能电池，能够以最高的效率将阳光转化为电能。尽管在提高材料纯度或表面钝化方面的努力微不足道，但已经实现了高效率。在这里，我们表明，陷阱状态在钙钛矿表面产生电荷积累和随之而来的复合损失在工作的太阳能电池。我们确定钙钛矿结构内的配位不足的碘离子负责，并利用超分子卤键络合成功地钝化这些网站。根据这种策略，我们展示了太阳能电池的最大功率转换效率为15.7%，稳定的功率输出超过15%，在恒定的0.81 V正向偏置下，在模拟的全阳光。表面钝化是钙钛矿太阳能电池未来发展的一个重要方向。
Organic-inorganic halide perovskites, such as CH3NH3PbX3 (X = I-, Br-, Cl-), are attracting growing interest to prepare low-cost solar cells that are capable of converting sunlight to electricity at the highest efficiencies. Despite negligible effort on enhancing materials' purity or passivation of surfaces, high efficiencies have already been achieved. Here, we show that trap states at the perovskite surface generate charge accumulation and consequent recombination losses in working solar cells. We identify that undercoordinated iodine ions within the perovskite structure are responsible and make use of supramolecular halogen bond complexation to successfully passivate these sites. Following this strategy, we demonstrate solar cells with maximum power conversion efficiency of 15.7% and stable power output over 15% under constant 0.81 V forward bias in simulated full sunlight. The surface passivation introduces an important direction for future progress in perovskite solar cells.