Highly-flexible perovskite photodiodes employing doped multilayer-graphene transparent conductive electrodes

We first report highly-flexible perovskite photodiodes, using AuCl3-doped multilayer-graphene transparent conducting electrodes. The doping effect of the AuCl3 is more effective when the number of layers (L-n) = 1 and 2 rather than 3 and 4, as analyzed by Raman scattering and sheet resistance. The photodiodes optimized at L-n = 2 exhibit a 10(5) photo-/dark-current ratio, 0.4 AW(-1) responsivity, 80% external quantum efficiency, 5.3 x 10(10) cm Hz(1/2)/W detectivity, 90 dB linear dynamic range, and similar to 1.1 mu s response time. In addition, the photodiodes show excellent bending stabilities, maintaining a responsivity at about 70% of its initial value, even after 1000 bending cycles at a bending curvature of 4 mm.