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@PHDTHESIS{Kutovyi:893044,
      author       = {Kutovyi, Yurii},
      title        = {{S}ingle-{T}rap {P}henomena in {N}anowire {B}iosensors},
      volume       = {238},
      school       = {Dortmund, Univ},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2021-02522},
      isbn         = {978-3-95806-544-4},
      series       = {Schriften des Forschungszentrums Jülich Reihe
                      Schlüsseltechnologien / Key Technologies},
      pages        = {171},
      year         = {2021},
      note         = {Dissertation, Dortmund, Univ, 2021},
      abstract     = {Single-trap phenomena (STP) in nanoscale transistor devices
                      possess outstanding propertiesthat are promising for many
                      useful and important applications including information
                      technologiesand biosensing. In this thesis, a novel
                      biosensing approach based on monitoring of STPparameters as
                      a function of target biomolecules on the surface of
                      liquid-gated (LG) silicon (Si)nanowire (NW) field-effect
                      transistor (FET) biosensors was proposed and demonstrated.
                      Toenhance STP dynamics and improve the efficiency of the
                      approach, unique two-layer (TL) NWFETs with NW channels
                      consisting of two Si layers with different concentrations of
                      dopantswere designed and fabricated. A stable and
                      leakage-free operation in liquid confirms the highquality of
                      TL NW devices. At the same time, fabricated TL
                      nanostructures are conceptuallydifferent from the
                      conventional uniformly doped Si NWs and demonstrate more
                      statisticallypronounced STP with considerably stronger
                      capture time dependencies on drain current comparedto that
                      predicted by classical Shockley-Read-Hall theory. A
                      comprehensive analysis ofthe experimental data measured at
                      low temperatures allowed the identification of the origin
                      ofsingle traps in TL NWs as a vacancy-boron complex. Several
                      important effects enabling the advancementof sensing
                      capabilities of STP-based devices were revealed using
                      fabricated TL NWFET biosensors. First, a significant effect
                      of channel doping on the quantum tunneling dynamicsof charge
                      carriers to/from a single trap was registered in TL
                      nanostructures, analyzed, andexplained within the framework
                      of proposed analytical model. Second, a distinct
                      fine-tuningeffect of STP parameters by applying a back-gate
                      potential to LG TL NW FETs was experimentallyrevealed and
                      supported by numerical simulations. Such a unique feature of
                      STP in TLNWs allows the sensitivity of STP-based biosensors
                      to be enhanced in a well-controllable way.Furthermore, STP
                      in NW FETs offer a great opportunity for the suppression of
                      low-frequencynoise. Considering a trap occupancy probability
                      (g-factor) as a signal, a new method for theestimation of
                      g-factor noise was proposed and utilized. As a result, the
                      effective suppressionof the low-frequency noise even beyond
                      the thermal noise limit was experimentally and
                      numericallydemonstrated. The derived analytical model showed
                      an excellent agreement with theobtained results underlining
                      the importance of STP for biosensing applications. Utilizing
                      theunique advantages of STP in fabricated TL NW FET
                      biosensors, several proof-of-concept applicationsincluding
                      high-sensitive detection of target chemical and biological
                      analytes: monoanddivalent ions, ascorbate molecules, and
                      amyloid-beta peptides were demonstrated. Thus,the performed
                      experiments together with the developed analytical models
                      represent a major advancein the field of biosensors and pave
                      the way for the next generation of novel
                      ultrasensitivebioelectronic sensors exploiting single-trap
                      phenomena.},
      cin          = {IBI-3},
      cid          = {I:(DE-Juel1)IBI-3-20200312},
      pnm          = {899 - ohne Topic (POF4-899)},
      pid          = {G:(DE-HGF)POF4-899},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:0001-2021080939},
      url          = {https://juser.fz-juelich.de/record/893044},
}