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Confinement Effects of Phosphorus Donors Embedded in Silicon Microcrystals
Author(s) -
Pawlak B.J.,
Gregorkiewicz T.,
Ammerlaan C.A.J.
Publication year - 1998
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199812)210:2<631::aid-pssb631>3.0.co;2-0
Subject(s) - hyperfine structure , crystallinity , annealing (glass) , silicon , photoluminescence , materials science , electron paramagnetic resonance , grain size , spectroscopy , scanning electron microscope , crystallography , chemistry , nuclear magnetic resonance , atomic physics , optoelectronics , metallurgy , physics , quantum mechanics , composite material
Due to their extended electronic structure shallow donors are believed to be very sensitive to confinement effects. Our interest is to investigate the influence of size on the properties of shallow donor phosphorus in mechanically milled silicon microcrystals. The crystallinity of powders is confirmed by X‐ray diffraction and the size as determined by scanning electron microscopy was found to be 0.25 μm for smallest to 4 μm for largest microcrystals. In the current experiment we use electron paramagnetic resonance to measure the hyperfine interaction between donor electron and P nucleus. The hyperfine constant and mutual overlap of donor wave functions exhibit significant dependence on grain size and subsequent annealing. By photoluminescence spectroscopy the appearance of a strong band around 1515 nm which shifts to higher energies with diminishing grain size has been established.