Room-Temperature Meniscus Coating of >20% Perovskite Solar Cells: A Film Formation Mechanism Investigation
Room-Temperature Meniscus Coating of >20% Perovskite Solar Cells: A Film Formation Mechanism Investigation
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DOI：
10.1002/adfm.201900092
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发表时间：
2019-06-01
影响因子：
19
通讯作者：
Li, Gang
中科院分区：
文献类型：
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作者：
Hu, Hanlin;Ren, Zhiwei;Li, Gang
理想情况下，钙钛矿太阳能电池（PSC）完全通过可扩展的溶液工艺在低温下制造，以实现简单制造、低成本加工、与柔性基板兼容以及基于钙钛矿的串联太阳能电池的承诺。然而，在这些加工条件下制备高质量的光活性钙钛矿薄膜是一个挑战。在这里，设计了一种层流空气刀辅助的室温弯月面涂覆方法，该方法使人们能够在固化过程中控制干燥动力学，并实现高质量的钙钛矿薄膜和太阳能电池。此外，该方法提供了用于钙钛矿膜干燥动力学的原位UV-vis和显微镜调查的固体模型平台，其提供了与动力学干燥过程期间的过饱和度、成核和生长速率相关的丰富见解，并最终提供了太阳能电池器件的膜形态和性能。展示了制造友好的无抗溶剂的室温涂层，其具有0.06 cm（2）的20.26%的功率转换效率和1 cm（2）的18.76%的功率转换效率。
Perovskite solar cells (PSCs) are ideally fabricated entirely via a scalable solution process at low temperatures to realize the promise of simple manufacturing, low-cost processing, compatibility with flexible substrates, and perovskite-based tandem solar cells. However, high-quality photoactive perovskite thin films under those processing conditions is a challenge. Here, a laminar air-knife-assisted room-temperature meniscus coating approach that enables one to control the drying kinetics during the solidification process and achieve high-quality perovskite films and solar cells is devised. Moreover, this approach offers a solid model platform for in situ UV-vis and microscopic investigation of the perovskite film drying kinetics, which provide rich insights correlating the degree of supersaturation, the nucleation, and growth rate during the kinetic drying process, and ultimately, the film morphology and performance of the solar cell devices. Manufacturing friendly, antisolvent-free room-temperature coating of hysteresis-free PSCs with a power conversion efficiency of 20.26% for 0.06 cm(2) and 18.76% for 1 cm(2) devices is demonstrated.