This semiconductor photodetector consists of a diode with at least two heterojunctions comprising two external layers, a first layer with a given kind or type of doping and a second layer with a kind or type of doping opposite to that of the first layer, the bandgap width of these two layers being determined...http://www.google.com/patents/US7619240?utm_source=gb-gplus-sharePatent US7619240 - Semiconductor photodetector, device for multispectrum detection of electromagnetic radiation using such a photodetector and method for using such a device
