By Albert C. Beer, R. K. Willardson
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Extra resources for Deep Levels, GaAs, Alloys, Photochemistry
1981). The rest were compiled by Mircea and Bois (1979). Using ( u ) and N, as given in the caption of Fig. 88 x 1OZ0)exp(-AET/kT). 1. DEEP LEVELS IN WIDE BAND-GAP 1II-V 25 TABLE I1 VALUE^ OF FRANCK-CONDON SHIFT(d& Energy (eV) d,-, (eV) Center FOR VARIOUS CENTERS Temp. 05 % one-electron center GaAs (“O”), EL2 center GaAs (Cr) Grimmeiss et al. 896 293 0 0 0 Kopylov and Pikhtin (1974b) Henry and Lang (1977) Jaros (1977)b Monemar and Samuelson (1978)” Henry and Lang (1977) Tyler et al. 2 Chantre and Bois (1980)’ and Chantre et al.
PCUR Braun & Grimrneiss (1973) PCAP TCAP Kukimoto et LPE TSC Fabre & Bhargava (1974) LEC TSC LPE TC LPE TSC LPE TSC I-MeV e DLTS I l l Fabre et 1 I l l VPE DLTS VPE PCAP VPE DLTS Lang & Kirnerling (1976) I? Henry & Lang (1977) I Wessels (1977) Gloriozova & Kolesnik (1978) I= IZ Tell & Kuijpers (1978) Ereitenstein et al. (1979) Nishizawa et al. (1979) I Schairer (1979) Fc Eaves et al. (1980) E I IS I5 DLTS OA (1974) Bhargava et al. (1976) I PCAP DLTS (1973) Smith et al. (1975) I DLTS VPE 81. Smith & Carter (1975) DLTS PCAP VPE 81.
15c. The transition of energy E, is the (optical) absorption, whereas the thermal excitation has energy E , . Thus the thermal and optical energies are not equal, differing by an energy A E , + AE, (28) where A E is related to the curvature and displacement of the parabolas. Optical emission, again assuming a Franck-Condon process, is at an energy E,. For parabolas of equal curvature, E, = E , E , = E, - 2 AE. (29) The difference in absorption and emission energies (= 2 A E for the present model) is the so-called Stokes shift.