Enhanced long wavelength omnidirectional photoresponses in photonic-structured perovskite photodetectors

Enhanced long wavelength omnidirectional photoresponses in organo-lead triiodide (CH3NH3PbI3) perovskite photodetectors (PDs) have been realized by incorporating a 1-D photonic-structured hole transporting layer (HTL), created by nanoimprint lithography. Our theoretical simulation supports the experimental results, revealing that photonic-structured CH3NH3PbI3 PDs enable efficient light absorption. Photonic-structured perovskite PDs also exhibit faster transient photoresponses as compared to a planar control PD over the wavelength range from UV to NIR. The photoresponsivity of photonic-structured PDs is less dependent on the angle of incident light, arising from the improved light in-coupling over a broader angle range of incident light. In particular, photonic-structured CH3NH3PbI3 PDs with unique features such as polarization-insensitive and enhanced long wavelength omnidirectional photoresponses are very attractive for application in high performance near infrared light detection.