Tunable Fabrication of MAPbX₃ Triangular-Micro-Wires Array for Constructing High Sensitivity Photodetector

Organic-inorganic hybrid perovskite (MAPbX(3)) is known having excellent photoelectric properties. Compared to polycrystalline films, perovskite micro/nanowires can provide improved optoelectronic properties, mechanical flexibility, and adaptability due to higher crystallinity. However, their economical, scalable, and controllable fabrication remains a challenge. In this work, the authors report a facile way to fabricate high-quality MAPbX(3) triangular-micro-wires (TMWs). The Si/SiO2 substrate with triangular-micro-trenches (TMTs) array serves as the template for the growth of MAPbX(3) TMWs array through blade coating. The MAPbX(3) TMW first nucleated at the trench bottom, which facilitating the nanowire growth with high crystallinity. In addition, the size and periodicity of TMTs array can be independently controlled, providing potential for scale-up device applications. The photodetectors fabricated with these MAPbI(3) TMWs show excellent responsivity of (144.5 +/- 2.1) A/W and specific detectivity of (2.7 +/- 0.02) x 10(11) Jones under weak light (0.5 mu W cm(-2)). Their photoresponse to pulsed light is stable and reproducible, with rise and decay times of 7.5 and 6.0 ms, respectively. Finally, with the demonstration of the image sensor application, MAPbX(3) TMWs array is anticipated to be suitable for large-area, high-performance integrated optoelectronics.