ナノ溝ガイドによる曲げ可能なプラスチック上でのCsPbBr3ナノワイヤアレイを用いた高機能フレキシブルフォトディテクタによる画像センシングと伝送

Perovskite nanowires offer exceptional optoelectronic properties, yet their large-scale integration into flexible optoelectronics faces challenges, including the inability to achieve epitaxial growth on amorphous flexible substrates and vulnerability of perovskites to degradation during postgrowth assembly. This work presents a nanogroove-guided crystallization strategy that enables in-plane aligned growth of CsPbBr₃ nanowires on bendable poly(ethylene naphthalate) (PEN) at 50 °C. By combining nanogrooved polydimethylsiloxane (PDMS) stamps and wettability-engineered PEN substrates, the method creates aligned nanochannels with vertically asymmetric wettability, guiding unidirectional nanowire growth without requiring lattice-matching or high-temperature processing. This approach facilitates transfer-free flexible device integration via in situ electrode deposition, preserving the nanowire's intrinsic optoelectronic properties. The resulting flexible photodetector combines a responsivity of up to 909.9 A W^-1, detectivity of up to 7.35 × 10¹³ Jones, response speed as fast as ∼50 μs, wide linear dynamic range of 89.5 dB, and robust mechanical stability─withstanding over 2000 bending cycles at a severe bending radius of 0.5 cm, underscoring the benefits of transfer-free flexible integration in harnessing the exceptional optoelectronic properties of perovskite nanowires. Last, their proof-of-concept application is showcased in optical image sensing and wireless image transmission. This study provides a scalable, low-temperature, and lattice-match-free pathway for integrating perovskite nanowires into high-performance flexible optoelectronics.