Perovskite single-crystal films, which exhibit exceptionally low trap density and nearly perfect translational symmetry, are believed to achieve the highest performance of perovskite-based optoelectronic devices. However, fabrication of these perovskite single-crystal films is quite difficult because of the uncontrollable nucleation caused by the rapid reaction of two perovskite precursors. We report a facile seed printing approach to selectively create millimeter-sized perovskite single-crystal films with controlled thickness and high yield. We show that perovskite single-crystal films can be perfectly transferred to almost arbitrary substrates through the printing process. The as-grown perovskite single-crystal films have excellent crystalline quality and morphology. We further demonstrate that perovskite single-crystal films can be directly printed for scalable fabrication of photodetectors and effective image sensors. This strategy allows high-yield fabrication of large perovskite single-crystal films for functional devices and may extend to other solution-processed materials for wide applications.

中文翻译：

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钙钛矿单晶膜可扩展生长的通用印刷方法。

钙钛矿单晶膜具有极低的陷阱密度和近乎完美的平移对称性，据信可实现基于钙钛矿的光电器件的最高性能。然而，由于两种钙钛矿前体的快速反应所引起的不可控制的成核，这些钙钛矿单晶膜的制造是非常困难的。我们报告了一种简便的种子印刷方法，可以选择性地创建具有受控厚度和高产量的毫米大小的钙钛矿单晶膜。我们表明，钙钛矿单晶膜可以通过印刷过程完美地转移到几乎任意衬底上。刚成长的钙钛矿单晶膜具有优异的结晶质量和形态。我们进一步证明，可以直接印刷钙钛矿单晶膜，用于光电探测器和有效图像传感器的可扩展制造。这种策略可以高产量地制造用于功能器件的大型钙钛矿单晶膜，并且可以扩展到其他溶液加工的材料，以实现广泛的应用。