Patent ID: 11948951
Assignee: XI AN TECHNOLOGICAL UNIVERSITY
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A method for preparing a wide spectral region multi-band detection structure with selective absorption enhancement, the detection structure comprising a plurality of sub-pixel units capable of detecting incident light in different bands, each sub-pixel unit is composed of a square well-shaped microstructure array and a metal lower electrode (2), a photosensitive layer (3), and an upper electrode (4) on the surface thereof, the size and array spacing of square well-shaped microstructures in different sub-pixel units are determined according to the detection bands of the sub-pixel units where they are located, the upper openings of the square well-shaped microstructures are hollow to form a resonant cavity, and the adjacent square well-shaped microstructures in the same sub-pixel unit form a resonant cavity, and
the method is featured by comprising the following steps:
determining the microstructure sizes of red light, green light, blue light and infrared light square wells respectively according to working wavebands;
preparing red light, green light, blue light and near-infrared light square well array structures simultaneously on a substrate to form a substrate;
electrolessly plating a conductive metal film as a metal lower electrode on the surfaces of the red, green, blue and infrared light square well array structures;
preparing a nano photosensitive layer with wide spectral response on the surface of the metal lower electrode;
preparing a transparent conductive nanowire grid as an upper electrode on the surface of the photosensitive layer;
etching an upper electrode, a photosensitive layer and a metal lower electrode among the red, green, blue and near-infrared light square well array structures to form mutually isolated red, green, blue and near-infrared light sub-pixel units.