Non-Stoichiometry in Semiconductors by K.J. Bachmann, H.-L. Hwang and C. Schwab (Eds.)

By K.J. Bachmann, H.-L. Hwang and C. Schwab (Eds.)

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Ultrasound influence on the diffraction intensity in an ideal crystal. Ε. Zolotoyabko 42 In the presence of intrinsic static strains, £, the shape of the I(w) curve is changed essentially. As it is shown in [2], the dip of the diffraction intensity appears at small w (Hw < 1) and only when the dynamic deformation by the acoustic wave 6d = kw (where k is the sound wave vector) exceeds the static strain 6, the linear part of the I(w) curve is observed. The effect is due to the multi-phonon scattering processes.

L T h e s o l u b i l i t y c u r v e o f t h e d o p a n t is l i n e a r up until a c o n c e n t r a t i o n o f t h e o r d e r o f t h e e l e c t r o n c o n c e n t r a t i o n a t t h e g r o w t h t e m p e r a t u r e in u n d o p e d m a t e r i a l ( g i v e n b y Eqn 2 with [ D j = 0). Since n g t < n. in L P E m a t e r i a l , s u c h m a t e r i a l s h o w s a markedly e x t e n d e d solubility range ( s e e Fig 2 o f ref. 16). It c a n f u r t h e r b e r e a d i l y s h o w n t h a t t h e s e l f - c o m p e n s a t i o n b e t w e e n t h e d o n o r a t o m and its a c c e p t o r c o m p l e x i n c r e a s e s w h e n t h e d o p i n g l e v e l e x c e e d s n , and t h a t , as a g t result, the r o o m temperature carrier concentration saturates at a value (n^isat)) given by: n^isat) = βΐη , + g 2 N [V °] exp(-E /kT)] [l g [V i d c A s d v + a A s °] exp(E /kT)/N ]* a v (3) c w h e r e β ( ~ 4 ) is t h e c o m p e n s a t i o n r a t i o N p / N ^ in t h e d i l u t e d o p i n g l i m i t .

Hurle 48 B o t h m a s s p e r u n i t c e l l and t i t r a t i o n t e c h n i q u e s i n d i c a t e t h a t m e l t - g r o w n G a A s g r o w n f r o m m e l t s w h i c h d e v i a t e b y up t o a f e w a t o m i c % f r o m t h e e q u i - a t o m i c c o m p o s i t i o n g i v e r i s e t o c r y s t a l s , t h e c o m p o s i t i o n o f w h i c h d e v i a t e f r o m t h e s t o i c h i o m e t r i c b y up to ~ ±5xl0 cnT . 1 8 Neither It is e n c o u r a g i n g t h a t b o t h t e c h n i q u e s g i v e c o m p a r a b l e m a g n i t u d e s .

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