DETERMINATION OF CUTOFF WAVELENGTH AND COMPOSITION DISTRIBUTION IN HG1-XCDXTE

The determination of cut-off wavelength, lambda(co), and composition d istribution for Hg1-xCdxTe has been discussed in this paper. A shift o f the cut-off-wavelength was found from the photo-response calculation for the HgCdTe devices with the same energy gap E-g but different thi ckness d. An expression of lambda(co)(x,T,d) has been derived from the half-maximum photo-response curve calculation.The composition uniform ity has been determined from the room-temperature transmission fitting procedure. The composition real space distribution is suggested to be determined by the combination of absorption edge phenomenon and therm al imaging technique.