Determination of pseudogap state density and carrier mobility in rf sputtered amorphous silicon. Quarterly technical progress report, January-March 31, 1980

Technical Report · Sun Jun 01 00:00:00 EDT 1980

DOI:https://doi.org/10.2172/6379217· OSTI ID:6379217

Paul, W

The effect of a variety of plasma cleaning procedures on the level of bulk and interfacial contaminants in the films is analyzed by secondary ion mass spectrometry. Bulk levels of 0 have been reduced considerably by N/sub 2/ plasma cleaning, but no reproducible reductions in interfacial contamination have been achieved. A method is described of determining the gap state density N(epsilon) of a-Si:H from field effect, in which no assumptions are made about the form of the band bending in the semiconductor. The problem is reduced to three successive integrals over an assumed N(epsilon) by change of variable from distance to applied voltage and the best fit to the experimental data is obtained by iteration of the assumed state density. The method is shown to be no less rigorous and considerably more economical than the recent analysis of Goodman, Fritzsche and Ozaki. In addition, an experimental means of determining the flat-band voltage to within 5% of the maximum gate voltage V/sub g/ used is demonstrated, by finding the value of V/sub g/ for which (kT/e)dlog I/sub SD//dV/sub g/ is independent of temperature.

• Research Organization: Harvard Univ., Cambridge, MA (USA). Div. of Applied Sciences
• Sponsoring Organization: USDOE
• DOE Contract Number: AC03-79ET23037
• OSTI ID: 6379217
• Report Number(s): DOE/ET/23037-3
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
36 MATERIALS SCIENCE
SILICON
CARRIER MOBILITY
ENERGY GAP
AMORPHOUS STATE
CARBON
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
HYDROGENATION
INTEGRALS
NITROGEN
OXYGEN
SPUTTERING
CHEMICAL REACTIONS
ELEMENTS
MOBILITY
NONMETALS
PHYSICAL PROPERTIES
SEMIMETALS
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