DLTS CAPACITANCE STUDIES ON DEEP LEVEL CENTERS IN VPE GAP-N

From DLTS‐, photo‐DLTS, and photocapacitance spectra on green emitting VPE GaP: N LED's the activation energies, the concentrations, and capture cross sections of four acceptor and four donor traps are determined. The concentration of the donor Ei = Ec − 0.46 eV behaves as the square of the net donor concentration. The most pronounced acceptor level Ei = Ev + 0.75 eV seems to have two states with capture cross sections σ∞ = 6.8 × 10−16 and 1.7 × 10−12 cm2 and respective capture activation energies of E∞ = +0.10 and +0.17 eV. Only the former correlates with the EL efficiency. Copyright © 1979 WILEY‐VCH Verlag GmbH & Co. KGaA