All-Sprayed-Processable, Large-Area, and Flexible Perovskite/MXene-Based Photodetector Arrays for Photocommunication

Flexible photodetectors (PDs) are attracting more attention due to their promising applications in wearable optoelectronic devices, bendable imaging sensors, and implantable optoelectronics. For the easy-processable technology of massively fabricating PDs, instead of the expensive and complex high-vacuum technique, the well-matched work function of their active materials is essential. Herein, all-sprayed-processable and large-area PDs are demonstrated on common paper based on two-dimensional (2D) CsPbBr3 nanosheets and conductive Ti3C2Tx (MXene). Ascribed to the superior conductivity of MXene, high crystallinity of 2D CsPbBr3, and their well-matched work function, the as-prepared PDs exhibit an outstanding on/off current ratio up to 2.3 x 10(3) and a remarkable photoresponse as fast as 18 ms. Specifically, the detectivity (D*) of 6.4 x 10(8) Jones and responsivity (R) of 44.9 mA W-1 under a bias of 10 V are achieved. Besides, after bending 1500 cycles, the as-prepared PDs can still maintain the excellent flexibility and stability. Based on this, a superior-quality and large-area 1665 pixel sensor in 72 cm(2) (approximate to 24 units cm(-2)) is developed, and it can clearly transmit the image of 0 to realize the photocommunication function. This work provides a low-cost method of massively producing the flexible large-area PDs for wearable optoelectronic devices and expanded photocommunication.