Parameter determination from currentvoltage characteristics of HgCdTe photodiodes in forward bias region
Currentvoltage characteristics of HgCdTe photodiodes in the forward bias region have been modeled considering mechanisms including drift-diffusion current, recombination current, metal-semiconductor contact and constant series resistance. Moreover, a fitting method based on the genetic algorithm has been developed to obtain values of related physical parameters from the measured dynamic resistancevoltage curves. Fitting results of \(n^+\)-on-\(p\) planar devices with different cutoff wavelengths are presented to illustrate the model and method, which are available and promising in acquiring device parameter values and evaluating the electrode contact quality.
currentvoltage characteristics hgcdte photodiode forward bias metal-semiconductor contact composition gradient