Filterless Si-Based Ultraviolet-Selective Photodetectors

Monolithic semiconductor photodiodes that discriminate against infrared and visible light and that can be tailored to detect ultraviolet light in selected wavelength bands have been invented. These devices could serve as ultraviolet sensors in such instruments as hydrogen- and hydrocarbon-flame detectors, dosimeters for monitoring exposure to ultraviolet in industrial processes, and instruments for measuring ultraviolet in sunlight to monitor the ozone content of the upper atmosphere.