P. Li, B. N. Shivananju, Y. Zhang, S. Li and Q. Bao
Journal of Physics D: Applied Physics, 50, 094002 (6) (2017)
In this work, a high performance vertical-type photodetector based on two-dimensional (2D) CH3NH3PbI3 perovskite nanosheets was fabricated. The low trap density of the perovskite nanosheets and their short carrier diffusion distance result in a significant performance enhancement of the perovskite-based photodetector. The photoresponsivity of this verticaltype photodetector is as high as 36 mA W−1 at visible wavelength, which is much better than traditional perovskite photodetectors (0.34 mA W−1). Compared with traditional planar-type perovskite-based photodetectors, this vertical-type photodetector also shows the advantages of low-voltage operation and large responsivity. These results may pave the way for exploiting high performance perovskite-based photodetectors with an ingenious device design.