Pairs of electron-holes are produced in the space-charge region of a diode pn
heterojunction as a result of an accelerated electron beam collisions having
enough energy larger or equal (≤ ٥٠ kev). Due to the intrinsic electric field an
electric cu
rrent will flow (Electron beam induced current EBIC) in an
appropriate external electric circiut. When an external forward electric field is
applied an electric current IF will flow, helping in electron-hole which
combination produc an additional cathodo-lumines-cence. the study of cothodolumines-
cence intensity variations will give electronic properties and electric
structure of the space - charge.