Density of gap states in hydrogenated amorphous silicon

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dc.contributor.author Yahya, Eddy
dc.contributor.department Physics and Astronomy
dc.date 2018-08-17T10:32:26.000
dc.date.accessioned 2020-07-02T06:05:33Z
dc.date.available 2020-07-02T06:05:33Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 1984
dc.date.issued 1984
dc.description.abstract <p>Amorphous silicon hydride films have been grown by an improved r.f. sputtering method in a hydrogen-argon atmosphere. Deposition parameters such as substrate temperature, gas flow rate, r.f. power, and argon partial pressure were kept constant, while hydrogen partial pressure was varied. The infrared vibrational modes, optical absorption, conductivity, and density of gap states from the Fermi level upward toward the conduction band edge of these films have been studied as a function of hydrogen content of the films. The density of states distribution of the films has been deduced from Space Charge Limited Current measurements with an Au/a-Si:H Schottky diode structure. Samples with ('(TURN)) 15.5% at. H have densities of states of 3 x 10('14) states/cm('3) eV and show large majority carrier mobility-lifetime products of 10('-5) cm('2)V('-1). An Au/a-Si:H diode which is nearly ideal (diode quality factor = 1.05) was obtained for a-Si:H films with hydrogen concentrations of about 16 at. %. The experi- mental results indicate that a high quality a-Si:H material with a low;density of states of 3 x 10('14) states/cm('3)eV can be obtained by r.f. sputtering method; ('1)DOE Report IS-T-1163. This work was performed under contract No. W-7405-Eng-82 with the U.S. Department of Energy.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/8230/
dc.identifier.articleid 9229
dc.identifier.contextkey 6330839
dc.identifier.doi https://doi.org/10.31274/rtd-180813-12030
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/8230
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/81196
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/8230/r_8505885.pdf|||Sat Jan 15 02:08:35 UTC 2022
dc.subject.disciplines Condensed Matter Physics
dc.subject.keywords Physics
dc.subject.keywords Solid state physics
dc.title Density of gap states in hydrogenated amorphous silicon
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 4a05cd4d-8749-4cff-96b1-32eca381d930
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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