Roll-to-roll slot-die coated P-I-N perovskite solar cells using acetonitrile based single step perovskite solvent system
Roll-to-roll slot-die coated P-I-N perovskite solar cells using acetonitrile based single step perovskite solvent system
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DOI：
10.1039/d0se00460j
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发表时间：
2020-07-01
影响因子：
5.6
通讯作者：
Watson, Trystan
中科院分区：
文献类型：
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作者：
Burkitt, Daniel;Patidar, Rahul;Watson, Trystan
在P-I-N钙钛矿型太阳能电池组中，使用单步钙钛矿型油墨和乙腈溶剂体系和柔性塑料基板，展示了所有有源层的滚涂。通过使用适当长度的弯月面导轨作为每种油墨流变性的涂布头的一部分，开发了缝模涂布辊到辊工艺(所有层具有共同的涂布速度)。高性能的器件展示了四个卷到卷的槽芯涂层和蒸发的顶部电极。对钙钛矿层的干燥条件进行了优化，发现干燥条件是获得良好性能的关键。开发了用于电子收集层的多溶剂混合体系，这些体系比常用的氯苯溶剂体系更具工业兼容性，并利用溶剂挥发度的梯度来提供良好的宏观成膜和快速干燥。稳定的功率转换效率为12.2%，这是迄今为止报道的最高的器件，除了顶部电极堆积卷对卷外的所有层。这项工作证明了一种用于钙钛矿太阳能电池的卷到卷制造工艺的可行性，这种工艺可以转移到完全在线的卷到卷工艺，所有涂层和干燥阶段在一条生产线上以相同的涂层速度顺序运行，并进一步展示了使用卷到卷制造方法生产高效率光伏电池的潜力。
Roll-to-roll coating of all active layers is demonstrated for a P-I-N perovskite solar cell stack, using a single step perovskite ink with an acetonitrile solvent system and flexible plastic substrate. A slot-die coating roll-to-roll process (with a common coating speed for all layers) is developed by using appropriate length meniscus guides as part of the coating head for each ink rheology. High performance devices are demonstrated with four roll-to-roll slot-die coated layers and evaporated top electrode. The drying conditions of the perovskite layer are optimized and found to be critical to achieving good performance. Multi solvent blend systems for the electron collection layer are developed that are more industrially compatible than the commonly used chlorobenzene solvent system and make use of a gradient of solvent volatilities to give both good macro film formation and rapid drying. A stabilised power conversion efficiency of 12.2% is demonstrated, that is the highest reported to date for devices with all layers other than the top electrode deposited roll-to-roll. This work demonstrates the feasibility of a roll-to-roll fabrication process for perovskite solar cells that could be transferred to a fully inline roll-to-roll process with all coating and drying stages made sequentially on one line running at a common coating speed and further demonstrates the potential to produce high efficiency photovoltaics using roll-to-roll fabrication methods.