Journal
APPLIED PHYSICS EXPRESS
Volume 5, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1143/APEX.5.025701
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We have established an atomic-layer-deposited Al2O3 overlayer deposition method, which makes the H-surface-terminated p-type channel diamond surface thermally stable and completely keeps the concentration and mobility high even at 150 degrees C. In a range from 230 to 500 K, the mobility is proportional to the inverse of temperature showing a property characteristic for degenerate hole gas. The ionization energy is estimated to be 6.1 meV, indicating that holes are not generated mainly by thermal activation. This thermal stabilization technology enables us to measure hole properties up to 230 degrees C and to realize H-terminated diamond field-effect transistors with a reproducible high drain current. (C) 2012 The Japan Society of Applied Physics
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