Paper 96-1
A study of polycrystalline CVD diamond by nuclear
techniques
PHYSICA STATUS SOLIDI A-APPLIED RESEARCH 154
(1): 327-350 MAR 1996 |
Manfredotti C, Fizzotti F, Polesello P, Vittone E, Wang F |
†Università di Torino, Dip. di Fisica Sperimentale, INFN-Sezione di Torino, via P. Giuria 1, I-10125 Torino Italy |
Keywords: RADIATION DETECTORS, diamond |
ABSTRACT
The effect of the
polycrystalline morphology of CVD diamond on its electronic properties has been
investigated by nuclear techniques, essentially by using the sample as a
nuclear detector. A particular
version of a proton
microbeam technique has been used for the first time in order to study the
inhomogeneities of carrier transport properties. The data have been correlated
with results obtained by other
techniques such as SEM,
XPS, and EPMA. A good evidence has been gathered for the connection between the
grain dimensions and the drift length of carriers in CVD diamond and for the
high electric
activity of grain
boundaries. A model for trapping and recombination at grain boundaries, which
could give a crude, but quite general exploration of electronic behaviour of
CVD diamond, is presented and
discussed. Possible
consequences presented on the applications of CVD diamond as a nuclear particle
detector and as UV light emitting diode are also briefly described.