A bulk charge modulated MOSFET for sensing light comprising a semiconductor substrate with a gate region of a first conductivity type formed in the substrate. The gate region forms a potential well for carriers of the first conductivity type. The well is formed at a substantial depth from the surface...http://www.google.fr/patents/US5317174?utm_source=gb-gplus-shareBrevet US5317174 - Bulk charge modulated device photocell
