We report a facile roll-printing method, geometrically confined lateral crystal growth, for the fabrication of large-scale, single-crystal CH3NH3PbI3 perovskite thin films. Geometrically confined lateral crystal growth is based on transfer of a perovskite ink solution via a patterned rolling mould to a heated substrate, where the solution crystallizes instantly with the immediate evaporation of the solvent. The striking feature of this method is that the instant crystallization of the feeding solution under geometrical confinement leads to the unidirectional lateral growth of single-crystal perovskites. Here, we fabricated single-crystal perovskites in the form of a patterned thin film (3 × 3 inch) with a high carrier mobility of 45.64 cm2 V−1 s−1. We also used these single-crystal perovskite thin films to construct solar cells with a lateral configuration. Their active-area power conversion efficiency shows a highest value of 4.83%, which exceeds the literature efficiency values of lateral perovskite solar cells.
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机译：我们报道了一种用于大型，单晶CH3NH3PbI3钙钛矿薄膜制造的简便的辊式印刷方法，即几何约束的横向晶体生长。在几何上受限的横向晶体生长是基于钙钛矿墨水溶液通过图案化的滚动模具转移到加热的基材上的，其中溶液在溶剂立即蒸发的情况下立即结晶。该方法的显着特征是进料溶液在几何约束下的立即结晶导致单晶钙钛矿的单向横向生长。在这里，我们以图案化的薄膜（3×3英寸）的形式制造了单晶钙钛矿，其载流子迁移率为45.64 cm 2 V -1 s < sup> -1 。我们还使用了这些单晶钙钛矿薄膜来构造具有横向构造的太阳能电池。它们的有效面积功率转换效率最高，为4.83％，超过了文献中横向钙钛矿太阳能电池的效率值。
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