Fig. 4: Narrow-band and Wide-angle imaging of a hemispherical photodetector.
From: Spray-coated perovskite hemispherical photodetector featuring narrow-band and wide-angle imaging
a The device structure of the hemispherical photodetector. b Left: The schematic of the imaging system and the optical photo of a swan as object. Right: The images captured by hemispherical photodetectors with different I/Br ratios. The colors of images are matched to the color function. c The photocurrent of hemispherical photodetector under irradiation from different angles (The size of the light source is smaller than the area of photodetectors.). The orange line is the relationship between the theoretical normalized transmittance and the incident angle of a planar perovskite film surface. d Left: The schematic of the imaging system for wide angle detection. Right: The images captured by planar and hemispherical photodetectors based on different angles of incident light. e The schematic of the structure of the micro-array (9 × 9) device f Left: The schematic of the imaging system and the optical photo of a square plastic object. Right: The micro-array imaging result.
