Voltage-controlled variable spectrum photodetector for 2D color image detection and reconstruction applications

摘要

Variable spectrum photodetector allowing the detection of the three main colors of the visible spectrum (red, green and blue) by varying the bias voltage by a few volts around zero. It is built using known thin- film technology and is externally connected by means of two electrical terminals, thus rendering the realization of integrated 2D matrices extremely easy. It is especially applied to the manufacture of TV cameras, fax machines, etc. and of all systems requiring images reconstruction, its structure consisting of a specific overlaying of thin films, preferably of hydrogenated amorphous silicon (a-Si:H) and of its silicon- carbon alloys (a-SiC:H) and silicon-germanium (a-SiGe:H) placed by "Glow Discharge" technique. The invention can be applied to big dimensions structures. Advantages essentially are electrical simplicity and, consequently, it has more maintainability.