Electronic structure and optical properties of silicon nanowires: A study using x-ray excited optical luminescence and x-ray emission spectroscopy

Sham, T. K.; Naftel, S. J.; Kim, P.-S. G.; Sammynaiken, Ramaswami; Tang, Yongliang; Coulthard, I.; Moewes, A.; Freeland, J.W.; Hu, Yongfeng; Lee, S. T.

doi:10.1103/physrevb.70.045313

Cited by 100 publications

(68 citation statements)

References 26 publications

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“…26 It has successfully been used to study the chemical origin of luminescence in porous Si, Si nanowires, SnO 2 nano-ribbons, Ga 2 O 3 nanostructures, and ZnS nanostructures as well as ZnO-ZnS and Si-CdSe nano-heterostructures. [27][28][29][30][31][32][33][34] In XEOL, one monitors the intensity of the luminescent bands as the X-ray energy is raised above the core level binding energy of a particular element in the system, thereby exciting an electron from a core level to a previously unoccupied state in the conduction band. The decay of the excited state can give rise to more intense luminescence via energy transfer to the optical channel.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and optical properties of CdSxSe1−x solid solution nanostructures from X-ray absorption near edge structure, X-ray excited optical luminescence, and density functional theory investigations

Murphy

Yiu

Ward

et al. 2014

Journal of Applied Physics

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Articles you may be interested in Ca K-edge X-ray absorption fine structure in BaTiO3-CaTiO3 solid solutions J. Appl. Phys. 113, 044106 (2013); 10.1063/1.4784226 In situ near-edge x-ray absorption fine structure spectroscopy investigation of the thermal defunctionalization of graphene oxide J. The electronic structure and optical properties of a series of iso-electronic and iso-structural CdS x Se 1Àx solid solution nanostructures have been investigated using X-ray absorption near edge structure, extended X-ray absorption fine structure, and X-ray excited optical luminescence at various absorption edges of Cd, S, and Se. It is found that the system exhibits compositions, with variable local structure in-between that of CdS and CdSe accompanied by tunable optical band gap between that of CdS and CdSe. Theoretical calculation using density functional theory has been carried out to elucidate the observations. It is also found that luminescence induced by X-ray excitation shows new optical channels not observed previously with laser excitation. The implications of these observations are discussed. V C 2014 AIP Publishing LLC.

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Section: Introductionmentioning

confidence: 99%

Electronic structure and optical properties of CdSxSe1−x solid solution nanostructures from X-ray absorption near edge structure, X-ray excited optical luminescence, and density functional theory investigations

Murphy

Yiu

Ward

et al. 2014

Journal of Applied Physics

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“…The native (1-2 nm thick) surface oxide on a SiNW may limit sensor performance due to the presence of interfacial electronic states. 28,29 In addition, the oxide surface of SiNWs acts as a dielectric which can screen the NW from the chemical event to be sensed. Covalent alkyl passivation of Si(111) surfaces can render those surfaces resistant to oxidation in air 30 and under oxidative potentials.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Real-Time Measurements of DNA Hybridization with Alkylated Nonoxidized Silicon Nanowires in Electrolyte Solution

et al. 2006

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The quantitative, real time detection of single stranded oligonucleotides with silicon nanowires (SiNWs) in physiologically relevant electrolyte solution is demonstrated. Debye screening of the hybridization event is minimized by utilizing electrostatically adsorbed primary DNA on an amine-terminated NW surface. Two surface functionalization chemistries are compared: an amine terminated siloxane monolayer on the native SiO 2 surface of the SiNW, and an amine terminated alkyl monolayer grown directly on a hydrogen-terminated SiNW surface. The SiNWs without the native oxide exhibit improved solution-gated field-effect transistor characteristics and a significantly enhanced sensitivity to single stranded DNA detection, with an accompanying two orders of magnitude improvement in the dynamic range of sensing. A model for the detection of analyte by SiNW sensors is developed and utilized to extract DNA binding kinetic parameters. Those values are directly compared with values obtained by the standard method of surface plasmon resonance (SPR), and demonstrated to be similar. The nanowires, however, are characterized by higher detection sensitivity. The implication is that Si NWs can be utilized to quantitate the solution phase concentration of biomolecules at low concentrations. This work also demonstrates the importance of surface chemistry for optimizing biomolecular sensing with silicon nanowires.

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“…In the literature [54], the PL emission from pure bulk silica is at 2.8 eV (442 nm), which is close to the blue peak from the alkylated samples at 430 nm. Sham et al [55] measured X-ray excited optical luminescence (XEOL) and X-ray emission spectroscopy (XES) on silicon nanowires and showed that the blue emission is associated with the silicon oxide layer on the samples employed. This suggests that the blue PL emission we see is from oxidized Si species and the orange PL emission originates from unoxidized Si.…”

Section: Origin Of the Orange And Blue Pl Emissionmentioning

confidence: 99%

Optical Properties of Nanostructured Silicon

Chao

2011

Comprehensive Nanoscience and Technology

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Electronic structure and optical properties of silicon nanowires: A study using x-ray excited optical luminescence and x-ray emission spectroscopy

Cited by 100 publications

References 26 publications

Electronic structure and optical properties of CdSxSe1−x solid solution nanostructures from X-ray absorption near edge structure, X-ray excited optical luminescence, and density functional theory investigations

Electronic structure and optical properties of CdSxSe1−x solid solution nanostructures from X-ray absorption near edge structure, X-ray excited optical luminescence, and density functional theory investigations

Quantitative Real-Time Measurements of DNA Hybridization with Alkylated Nonoxidized Silicon Nanowires in Electrolyte Solution

Optical Properties of Nanostructured Silicon

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