Bio-inspired materials as interfacial layers for high performance perovskite photodetectors

Perovskites have shown potential for use as high performance photodetectors, where the responsivity and detectivity of the perovskite photodetector (PePDs) can be improved by engineering its interfacial properties. Herein we report the applications of bio-inspired materials, deoxyribonucleic acid (DNA) and guanine, as functional interfacial layers for high performance PePDs. The best bio-material modified PePDs exhibit ∼2x enhancement of the photo-current than that of the reference PePDs with no modifications. Further optimization of the thickness for the bio-materials based functional layers enables the PePD to achieve a remarkable responsivity of 0.37 A W^-1 and detectivity of 1.85 x 10¹² Jones at the wavelength of 745 nm. Electrical and morphological studies of the PePDs indicate that DNA functional layers acting as electron extraction pathways could effectively enhance the photo-current. Our work comes up with an ecofriendly and low-cost method for fabricating high performance PePDs and therefore provides foundations for the future exploration of the application of bio-materials in opto-electronics.