Graphene-Assisted Growth of Patterned Perovskite Films for Sensitive Light Detector and Optical Image Sensor...

Controlled growth of high-quality patterned perovskite films on a large scale is essentially required for the application of this class of materials in functional integrated devices and systems. Herein, graphene-assisted hydrophilic-hydrophobic surface-induced growth of Cs-doped FAPbI₃ perovskite films with well-patterned shapes by a one-step spin-coating process is developed. Such a facile fabrication technique is compatible with a range of spin-coated perovskite materials, perovskite manufacturing processes, and substrates. By employing this growing method, controllable perovskite photodetector arrays are realized, which have not only prominent photoresponse properties with a responsivity and specific detectivity of 4.8 AW^-1 and 4.2 × 10¹² Jones, respectively, but also relatively small pixel-to-pixel variation. Moreover, the photodetectors array can function as an effective visible light image sensor with a decent spatial resolution. Holding the above merits, the proposed technique provides a convenient and effective pathway for large-scale preparation of patterned perovskite films for multifunctional application purposes.