Volume 86, Issue 10, 15 November 1999
Index of content:
86(1999); http://dx.doi.org/10.1063/1.371610View Description Hide Description
A closed hydrodynamic approach for a full nonparabolic band model is developed from the maximum entropy principle. Generalized kinetic fields are introduced within a total average-energy scheme. Numerical calculations for bulk and submicron Si structures are found to compare well with those obtained by ensemble Monte Carlo simulators thus validating the proposed approach.
86(1999); http://dx.doi.org/10.1063/1.371611View Description Hide Description
Electrical activation of In of 18%–52% of the implanted dose was obtained in Si samples having a coimplantation after rapid thermal annealing (RTA) at 800–1000 °C for 15 s. This electrical activation yield markedly contrasts with that in samples singly implanted with In in which only ≅0.5% of the dose was activated. The following features were observed in the coimplanted samples: (i) a reverse annealing of the electrical activation in the temperature range of 800–900 °C; (ii) significant reduction of the In profile redistribution during RTA; and (iii) the electrically activated In concentration is substantially higher than the substitutional In concentration. These findings are discussed in terms of the interaction between C atoms and Si self-interstitials strain compensation between C and In atoms in the Si lattice, and formation of stable In substitutional–C substitutional acceptors centers.
86(1999); http://dx.doi.org/10.1063/1.371612View Description Hide Description
This study concerns a hitherto unknown bcc→fcc allotropic transformation in Nb induced by the mechanical alloying of This metastable transformation is preceded by a gradual increase in the lattice parameter of bcc–Nb. The stored excess energy in nanocrystalline bcc–Nb may be responsible for the bcc→fcc phase transition.