Rapid Capillary-Assisted Solution Printing of Perovskite Nanowire Arrays Endables Scalable Production of Photodectors.

: The ability to deliberately solution-print large-scale perovskite-based nanostructures represents a significant endeavor towards the convenient creation of a rich variety of optoelectronic materials and devices. Despite recent impressive progress in producing perovskite nanowires (NWs) for optoelectronics, it remains challenging to solution-print an array of NWs with precisely controlled position and orientation. Herein, we report a robust capillary-assisted solution printing (CASP) strategy to rapidly access aligned and highly crystalline perovskite NWs array. The key to the CASP approach lies in the judicious integration of capillary-directed assembly via periodic nanochannels and solution printing via the programmably-moved substrate to fast guide the deposition of perovskite NWs. The growth kinetics of perovskite NWs is closely examined by in-situ optical microscopy to scrutinize the perovskite crystallization. Intriguingly, as-printed perovskite NWs array exhibit excellent optical and optoelectronic properties, and can be conveniently implemented for scalable fabrication of photodetectors.