Ultraviolet light detector with fast response, high sensitivity and low noise

The invention relates to an ultraviolet light detector with fast response, high sensitivity and low noise. The ultraviolet light detector comprises a photosensitive layer which is made of wide forbidden band crystalline material; the two surfaces of the photosensitive layer are respectively provided with a first electrode and a second electrode; a positive electrode of a power source is connectedwith a second electrode layer; a negative electrode of the power source 4 is electrically connected with a coaxial joint by a resistor; a conductive adhesive is coated on the surface of the first electrode 2; the conductive adhesive 8 is coated along the periphery of the surface of the first electrode 2; the shape of a middle blank part of the first electrode is consistent with the shape of a window on a shell; the middle blank part of the surface of the first electrode 2 is a window of the detector; and the photosensitive layer 1 is fixed on the inner wall of the shell 7 by the coated conductive adhesive 8. As the photosensitive layer is made of wide forbidden band material, the ultraviolet light detector does not respond to infrared lights and visible lights. The detector is sealed in the metal shell, not only has very good anti-interference capability, but also has very high detectivity and sensitivity to ultraviolet lights and has very important and wide application in the fields of life, scientific research, military affairs and the like.