A semiconductor diode has three adjacent regions. The doped regions are doped in the same manner and are separated from one another by a third, intrinsic region. The intrinsic region is dimensioned such that upon application of a specific external voltage at the operating temperature of the diode, it...http://www.google.com.au/patents/US5047355?utm_source=gb-gplus-sharePatent US5047355 - Semiconductor diode and method for making it
