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Compton, W.D. Jones, Colin Elliott 2011-07-27T15:44:50Z 2011-07-27T15:44:50Z 10000-01-01 1970 Silicon crystals which have been irradiated with neutrons, high energy electrons, or gamma-rays at room temperature show two strong luminescence bands in the near infrared. Both bands have a sharp zero-phonon line followed by a series of broad phonon assisted peaks. The higher energy band associated with a zero-phonon line at 0.97 eV is independent of any impurities while the lower energy band with a zero-phonon line at 0.79 eV is seen only in silicon containing oxygen. Data on the temperature and stress dependence of the luminescence bands have been taken in order to obtain information on the type of defects and the optical transitions involved. The narrow line widths observed for the zerophonon lines show that the transitions do not involve a free carrier. The zerophonon broadening and the major phonon assisted structure can be related to interactions with the momentum conserving transverse acoustical phonons. The energies and form of the bands do not fit the usual mechanisms involving an exciton bound to a neutral or ionized donor or acceptor. An exciton bound to a neutral defect which has a trapping level nearly as deep as the binding energy determined from the luminescence is a possible mechanism. The zero-phonon line at 0.79 eV is a doublet showing thermal pbpulation effects which relate it to two levels in the initial state. The lack of any association with impurities, the annealing, and the stress data for the bands associated with the 0.97 eV zero-phonon line all support an identification of these bands, with the divacancy. The oxygen dependence and the thermal stability of the bands associated with the 0.79 eV zero-phonon line lead to a tentative identification of these bands with the K-center or G-15 center seen in EPR. A model for this defect which was tentatively suggested by the EPR investigators consists of two nearest neighbor substitutional oxygen atoms in a [221] crystal orientation. The stress data are not completely explained by this model and a [lOO] defect model would also fit the stress splitting. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-27T15:44:49Z No. of bitstreams: 1 1970_jonesc.pdf: 3948843 bytes, checksum: 3dc7d96e498fab6dce0ba99c1a4ef320 (MD5) Made available in DSpace on 2011-07-27T15:44:50Z (GMT). No. of bitstreams: 1 1970_jonesc.pdf: 3948843 bytes, checksum: 3dc7d96e498fab6dce0ba99c1a4ef320 (MD5) Previous issue date: 1970 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-27T15:44:50Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:33:10-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 6054238 http://hdl.handle.net/2142/25858 en 1970 Colin Elliott Jones luminescence spectrum irradiated silicon silicon crystals stress dependence The effect of stress on the luminescence spectrum of irradiated silicon Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.