Porous Single-Wall Carbon Nanotube Templates Decorated with All-inorganic Perovskite Nanocrystals for Ultraflexible Photodetectors

As an inevitable optoelectronic material with unique properties, halide perovskites have attracted increasing attention in recent years. Meanwhile, the hybridization of nanostructured perovskites with one-dimensional (1D) or two-dimensional (2D) functional materials has exhibited unique applications in nanotechnology. In this communication, a highly conducting porous single-wall carbon nanotube (p-SWCNT) template decorated with phase-pure CsPbBr₃ nanocrystals by a simple solution-phase technique was demonstrated, and the ultraflexible photodetector Au/p-SWCNT:CsPbBr₃/Au showed high sensitivity even in a highly bending state. Also, the mechanism of wetting CsPbBr₃ along the p-SWCNT and the detailed fabrication process for the ultraflexible photodetectors were highlighted. The direct contact (in situ) on the p-SWCNT by crystallization of the perovskite precursor can effectively enhance the charge transfer at their interface. At an applied bias of +5 V, the optimized photodetector Au/p-SWCNT:CsPbBr₃/Au exhibits a maximum photoresponsivity of 41.0 AW^-1 with a specific detectivity of 1.67 × 10¹² Jones under an incident 232 μW/cm² 520 nm illumination. In addition, it exhibits excellent mechanical and electrical properties even under high strain (i.e., bending angle up to -17°) and recovers the original performance after repeated bending cycles up to 1000 times. Our experimental results showed that such hybrid materials provide a promising method for rigid and flexible optoelectronic devices.