Spin-diffusion across a organic-semiconductor interface

B.Sc. thesis, Unpublished, May 2002.

(main results published in Goehring and Michal, 2004)

Download pdf: Goehring_bsc.pdf

Lucas Goehring

Department of Physics, University of British Columbia,

6224 Agricultural Road, Vancouver, BC, V6T 1Z1, Canada

Cross-polarization experiments were done to observe and quantify the diffusion of spin polarization between hydrogen nuclei and phosphorus nuclei, at the surface of an indium phosphide powder coated with 4-trifluoromethylbenzylbromine. I report a series of models describing this spin diffusion, and present NMR results confirming predictions of these models.  I show that spin diffusion occurs efficiently across this organic-semiconductor interface. I also show how spin polarization can be manipulated with simple pulse programs.  This research will be of use in the development of a technique to enhance NMR signals by the optical pumping of semiconductors.