Controlled crystallinity and morphologies of 2D Ruddlesden-Popper perovskite films grown without anti -solvent for solar cells
Controlled crystallinity and morphologies of 2D Ruddlesden-Popper perovskite films grown without anti -solvent for solar cells
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用于太阳能电池的无反溶剂生长的 2D Ruddlesden-Popper 钙钛矿薄膜的受控结晶度和形貌
DOI：
10.1016/j.cej.2020.124959
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发表时间：
2020-08-15
影响因子：
15.1
通讯作者：
Tian, Jianjun
中科院分区：
文献类型：
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作者：
Huang, Fei;Siffalovic, Peter;Tian, Jianjun
Ruddlesden-Popper(Ruddlesden-Popper，Ruddlesden-Popper，然而，提高薄膜的结晶度和晶体取向以提高太阳能电池的效率还有很大的空间。此外，为了获得结晶度和取向较好的2D RP钙钛矿薄膜，通常采用反溶剂的辅助方法。然而，反溶剂法产生了大量对人体健康有害的挥发性有机化合物，对控制具有挑战性。在此，我们用简单的一步沉积法制备了2DRP钙钛矿(PEA)_2(MA)_4Pb_5I_(16)(n=0.5)薄膜。MACL添加剂可以在未经热处理的情况下诱导形成由钙钛矿晶体组成的中间相，从而直接促进2D-RP钙钛矿薄膜在衬底上的垂直取向。在介孔TiO2电子传输层上沉积的2D RP薄膜具有较高的结晶度和择优的垂直结晶取向。所得器件的功率转换效率为9.7%，远高于未制备MACL的器件(0.66%)。
Two-dimensional (2D) Ruddlesden-Popper (RP) perovskite films have attracted considerable attention for the environmentally stable perovskite solar cells. However, there is a big space for improving the film crystallinity and its crystallographic orientation to enhance the efficiency of solar cells. In addition, the assistance of anti-solvent is commonly used to obtain a better crystallinity and orientation of 2D RP perovskite films. Nevertheless, the anti-solvent method produces a lot of volatile organic compounds toxic to human health and is challenging to control. Here, we prepared 2D RP perovskite (PEA)2(MA)4Pb5I16(n = 5) films with the assistance of methylammonium chloride (MACl) additive via a simple one-step deposition method by avoiding anti-solvent treatment. The MACl additive is believed to induce the formation of an intermediate phase composed of perovskite crystals without annealing, which directly promotes the vertical alignment of 2D RP perovskite films on the substrate. The 2D RP films deposited on the mesoporous TiO2electron transport layer showed high crystallinity and preferential vertical crystallographic orientation. The resulting devices exhibited a power conversion efficiency of 9.7%, much higher than that of the devices prepared without MACl (0.66%).