Vacuum ultraviolet detection device - a photomultiplier tube (PMT): excellent overall performance, mature technology, but the price is high, weight, easy to damage, and the need high pressure operation. Solid state UV detectors pieces:? Based on Si, GaAs, GaP and other conventional semiconductor technology is relatively mature, the need to install expensive filters based on GaN, SiC and other wide bandgap semiconductor wide band gap, high temperature, wide band gap semiconductor material to ultraviolet? absorption of light by the band gap of the decision, which has a natural frequency selectivity without requiring the installation of filters, while the wide band gap semiconductor materials typically also has good thermal conductivity, high saturated electron drift velocity and excellent chemical stability etc., is an ideal material for the production of UV detector.