Umbrella-shaped gate field-effect transistor for biosensing measurements

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dc.contributor.advisor Santosh Pandey
dc.contributor.author Tao, Chengwu
dc.contributor.department Electrical and Computer Engineering
dc.date 2018-08-11T16:32:48.000
dc.date.accessioned 2020-06-30T02:30:56Z
dc.date.available 2020-06-30T02:30:56Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2008
dc.date.embargo 2013-06-05
dc.date.issued 2008-01-01
dc.description.abstract <p>Based on previous CMOS-compatible biosensor designs and the flash memory technology, a novel Umbrella-Shaped Field-Effect Transistor (UGFET) is realized as a biochemical charge sensor in the MOSIS AMIS 1.5 um standard CMOS process. The devices show high scalability and versatility needed for VLSI application. The UGFET device architecture is modified from previous CvMOS (Shen et al. 2003) and CMFET (Barbaro et al. 2006) designs and is scaled down to maximize the charge sensing area and drastically improve the chip density. The device simulation results show an approximate 1 volt increase in floating gate voltage for every 10 nC/cm^2 charge density increase on the sensing electrode. The designed UGFET devices are quite stable and very sensitive to the gate potential change. Two methods based on shifts in the threshold voltage and drifts in the subthreshold voltage slope are developed to sense and detect miniscule charges in charged poly electrolytes and poly amino acids. All the measured results are consistent and show the applicability of using UGFET devices as charge-modulated biosensors. Array implemented sensor chips are also taped out and tested with biochemical solutions.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/10779/
dc.identifier.articleid 1771
dc.identifier.contextkey 2806969
dc.identifier.doi https://doi.org/10.31274/etd-180810-1471
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/10779
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/24985
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/10779/Tao_iastate_0097M_10031.pdf|||Fri Jan 14 18:27:48 UTC 2022
dc.subject.disciplines Electrical and Computer Engineering
dc.subject.keywords biosensor
dc.subject.keywords floating gate transistor
dc.title Umbrella-shaped gate field-effect transistor for biosensing measurements
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication a75a044c-d11e-44cd-af4f-dab1d83339ff
thesis.degree.level thesis
thesis.degree.name Master of Science
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