Boosted Perovskite Photodetector Performance Using Graphene as Transparent Electrode

In this paper, a new perovskite photodetector based on Graphene/reduced Graphene oxide/Perovskite material system has been investigated. A rigorous study through design of high speed and high sensitivity photodetector has been conducted to achieve an optimum device performance. The proposed photodetector was studied using 3D Atlas Silvaco simulator with regard to dark current, energy band diagram, electric field profile, photo to dark current ratio (PDCR), responsivity, sensitivity and detectivity. Our findings demonstrate the outstanding ability of the proposed Graphene electrode scheme to reduce the undesirable shadowing effect and enhance the collection mechanism. Besides, reduced graphene oxide interlayer with high conductivity plays a crucial role for high efficient charge transportation. The proposed design displays 10 times photocurrent improvement when compared to the conventional design Au/TiO2/Perovskite photodetector. The proposed device displays a high value of responsivity of 340 A/W, a 100 GHz bandwidth with 10 µs transient response, and significant PDCR of 646.4, high detectivity of 2.61 × 1013 (Jones) and high sensitivity of 6.46 × 104. In addition, the proposed photodetector shows ruggedness under high temperature condition. This modeling strategy is able to direct other researchers in the design and development of efficient perovskite optoelectronic devices.