Self-Powered Printed Flexible Bifacial Perovskite Photodetector

Perovskite photodetectors (PPDs) may have an exciting commercial impact owing to their excellent device performance and affordability. However, to enhance their competitiveness in the industry, a few technological aspects of PPDs, such as scalability, robustness, weight, and semitransparency, still require further improvement. This work focuses on the scalable fabrication of PPDs on plastic substrates using slot-die coating techniques employing dielectric-metal-dielectric (DMD) transparent top contacts. The DMD provides the devices with a bifaciality feature. The device’s functional layers are deposited using the slot-die coating technique, whereas the top DMD contacts are deposited using thermal evaporation. The fabricated devices demonstrate remarkable performance and a high bifaciality factor in the visible spectrum. For bottom-side illumination, the responsivity and detectivity of devices have excellent values reaching 0.2 A W^-1 and 2 × 10¹¹ Jones, respectively. As for top-side illumination, they are as high as 0.15 A W^-1 and 1.47 × 10¹¹ Jones, respectively. The overall bifaciality factor in devices for the visible spectrum is around 65% and can reach values of up to 78% in the 610-650 nm range. Furthermore, the fabricated devices without any encapsulation in air maintain around 28% of their initial performance after 50 bendings.