Overcoming size limits with dynamic templates enabling large area single crystal nanowire arrays for photodetectors

Ordered one dimensional perovskite single-crystal nanowire arrays, which combine high surface-to-volume ratios, directional charge transport, and mechanical flexibility, are typically prepared through solution or vapor phase techniques using templates of silicon, polydimethylsiloxane, photoresist, or aluminum oxide to control crystal growth. However, the size limits of these templates restrict the scalability of the arrays. Here, we introduce a dynamic template-assisted coating strategy that integrates blade coating to address this limitation. The method enables deposition of nanowire arrays on substrates with an area 12 times larger than the template. Incorporating a fluorinated passivating agent into the precursor suppresses surface defect formation and improves structural quality. Photodetectors based on MAPbBr₃ arrays achieve a detectivity of 3.9 × 10¹⁴ Jones, a linear dynamic range of 160.3 dB, and a responsivity of 1660 A W^-1, and retain 90.3% of their photocurrent after 300 h at 85% relative humidity without encapsulation.