Lookup NU author(s): Professor Patrick Briddon
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A center from the family of "fourfold coordinated (FFC) defects", previously predicted theoretically, has been experimentally identified in crystalline silicon. It is shown that the trivacancy (V-3) in Si is a bistable center in the neutral charge state, with a FFC configuration lower in energy than the (110) planar one. V-3 in the planar configuration gives rise to two acceptor levels at 0.36 and 0.46 eV below the conduction band edge (E-c) in the gap, while in the FFC configuration it has trigonal symmetry and an acceptor level at E-c-0.075 eV. From annealing experiments in oxygen-rich samples, we also conclude that O atoms are efficient traps for mobile V-3 centers. Their interaction results in the formation of V3O complexes with the first and second acceptor levels at E-c-0.46 eV and E-c-0.34 eV. The overall picture, including structural details, relative stability, and electrical levels, is accompanied and supported by ab initio modeling studies.
Author(s): Markevich VP, Peaker AR, Lastovskii SB, Murin LI, Coutinho J, Torres VJB, Briddon PR, Dobaczewski L, Monakhov EV, Svensson BG
Publication type: Article
Publication status: Published
Journal: Physica Review B
ISSN (print): 1098-0121
ISSN (electronic): 1550-235X
Publisher: American Physical Society
Notes: Article no. 235207
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