This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/25309
Description
Title
Microwave studies of amorphous silicon
Author(s)
Askew, Thomas Rendall
Issue Date
1984
Doctoral Committee Chair(s)
Stapleton, H.J.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
amorphous silicon
electron paramagnetic resonance
electron spin relaxation
Language
en
Abstract
Electron paramagnetic resonance and electron spin relaxation rates of the intrinsic paramagnetic center (g=2.0055) in amorphous silicon have been studied in the 0.3 -1.2 K temperature range. Various sample preparation techniques were used, including ion implantation, sputtering, arid vacuum evaporation. The temperature dependence of the spin lattice relaxation rates depends somewhat on sample preparation but is always very
close to simple T power laws. The n values observed in this study fall into two ranges: 2.09 -2.36 and 3.26 -3.47. Comparison of measurements at 9.3 GHz and 16.5 GHz indicates that the observed rates are independent
or very nearly independent of microwave frequency and applied magnetic field.
Conventional one and two phonon spin lattice relaxation mechanisms cannot account for the observed temperature dependences. A theory involving spin lattice relaxation by coupling to a distribution of two level systems (TLS) is presented. The theory is adjusted so that it can be applied in the relevant temperature range and its predictions are compared to the experimental results. An attempt is made to identify the TLS and the TLS-spin coupling using electron-nuclear double rescnance (ENDOR), microwave frequency dielectric absorption, and magn
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
