Dependence of the spectral characteristics of long photodiodes with a variable-band base on the excitation level

10.1007/s11453-008-1016-y

“…It was established that the ∆E g gradient can affect substantially the photoelectric phenomena in long diodes [73]. The use of alloys with variable composition can bring about an additional increase in the photosensitivity due to a variation in the injection-related gain of photocurrent; this gain depends on where in the base optical generation of nonequilibrium charge carriers takes place.…”

“…The injection-related gain is higher in the case of the built-in field that pushes the charge carriers to the bulk of the base. The value and direction of ∆E g , the injection level, and the density of optical flux affect the spectral characteristics of photosensitivity for long graded-gap photodiodes with double injection [74].…”