Integration of Nanowire Devices in Out-of-Plane Geometry

Manandhar, Pradeep; Akhadov, E. A.; Tracy, Clarence; Picraux, S. T.

doi:10.1021/nl100747w

Cited by 23 publications

(32 citation statements)

References 45 publications

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“…Modulating the distribution of the number of particles per patterned feature at a single particle level demonstrates the capabilities of the nanopatterned PEG brushes as a platform for the assembly of Au NPs on surfaces. Previous studies33, 41, 42 showed that confining the substrate‐particle interaction into nanoscopic dimensions leads to immobilization of NPs at specific numbers and orientations. The novelty of nanopatterned PEG brushes is the presence of additional knobs (molecular weight of the brush and size of the particle) to tune the substrate‐particle interaction at the nanoscale.…”

Section: Resultsmentioning

confidence: 99%

Tunable Assembly of Gold Nanoparticles on Nanopatterned Poly(ethylene glycol) Brushes

Önses

Nealey

2013

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The organization of metallic nanoparticles (NPs) into ordered arrays on nanopatterned surfaces is an enabling process to fabricate devices and study the properties of the particles. Tailoring the interaction between NPs and nanopatterns is a necessity to gain a high level of control in this process. Here, nanopatterned poly(ethylene glycol) (PEG) brushes are presented as a platform for the organization of Au NPs on surfaces. The binding of citrate-stabilized Au NPs to the PEG brushes depends on the size of the particles and molecular weight of the brushes: the density of NPs immobilized on the nanopatterns of PEG brushes increases with decreasing the diameter of the particles and increasing the chain length of the brushes. The key aspect of the process is to pattern PEG brushes with high resolution and chemical contrast to provide controllable and specific interaction between Au NPs and nanopatterns at a single particle resolution. The modulation of the number (0-4) of Au NPs (e.g., 30 nm) per patterned feature with a high level of accuracy and the generation of patterned heterostructures that consist of two different sizes (e.g., 40 and 20 nm) of particles constitute two examples showing the capabilities of the presented platform.

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Section: Resultsmentioning

confidence: 99%

Tunable Assembly of Gold Nanoparticles on Nanopatterned Poly(ethylene glycol) Brushes

Önses

Nealey

2013

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“…In addition, the RTJ units by themselves are tiny units that can be structured and arranged into periodic array (by controlling the VLS growth of SiNWs as demonstrated in previous works,) which will be convenient for precise electric addressing and signal processing. Meanwhile, the Si‐based RTJ units are promising candidates to serve as self‐powered and biofriendly photodetectors to bio tissue environment .…”

Section: Resultsmentioning

confidence: 99%

Biomimetic Radial Tandem Junction Photodetector with Natural RGB Color Discrimination Capability

Wang

et al. 2017

Advanced Optical Materials

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crystalline Si (c-Si) are weak in the light absorption over the human vision spectrum, because of its indirect bandgap, while the critical color-sensing capability is also lost in these implementations. [14] Actually, in human retina, there are three types of retinal cone cells, labeled as S, M, and L in Figure 1c, that are in charge of discriminating color signals in Blue, Green, and Red wavelength bands, [1][2][3] respectively. Imitating natural rod or cone cells could inspire a biomimetic design of advanced photoreceptors with new functionalities powered by three dimensional (3D) nanophotonic structuring and engineering.In this work, we propose a novel 3D radial tandem junction (RTJ) photodetector design, consisting of two radially stacking hydrogenated amorphous silicon (a-Si:H) PIN junctions over 3D silicon nanowire (SiNW) cores as schematically illustrated in Figure 1b, to achieve natural RGB-colordiscrimination in the RTJ rod-cells without the need of any filter system. It is important to note, the a-Si:H layer allows a much stronger light absorption compared to that of c-Si, with an order of magnitude stronger light absorption coefficient over the full human vision spectrum, [15][16][17][18][19][20] as shown in Figure 1d. Built over a 3D NW framework, [21][22][23][24] a highly efficient light trapping and absorption can be expected thanks to the unique resonant-mode-assisted wavelength-selective absorption profile within the cavity-like nanowire radial junction units. [21,[25][26][27][28] These biomimetic RTJ photodetectors could find important applications in exploring a new RGB color sensing implementation.

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“…In previous work on the electrostatic assembly of nanoparticles, substrates were left in the nanoparticle solutions overnight to reach equilibrium [9]. However, the electrostatic assembly should be rather fast due to the strong attraction between the negatively charged particles and the positively charged nanopattern.…”

Section: Effect Of the Immersion Time On The Nanopatterningmentioning

confidence: 99%

“…It is often used in conjunction with another functional molecule that repels or prevents the Au NPs from non-specifically depositing on the non-aminosilane patterned areas [10,17,19,20,22]. In other cases, the resist remains on the Si surface to enable easy removal of non-specifically bound Au NPs [9,10].…”

Section: Introductionmentioning

confidence: 99%

Directed self-assembly of nanogold using a chemically modified nanopatterned surface

Nidetz

Kim

2012

Nanotechnology

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Electron-beam lithography (EBL) was used to define an aminosilane nanopatterned surface in order to electrostatically self-assemble gold nanoparticles (Au NPs). The chemically modified nanopatterned surfaces were immersed into a Au NP solution to allow the Au NPs to self-assemble. Equilibrium self-assembly was achieved in only 20 min. The number of Au NPs that self-assembled on an aminosilane dot was controlled by manipulating the diameters of both the Au NPs and the dots. Adding salt to the Au NP solution enabled the Au NPs to self-assemble in greater numbers on the same sized dot. However, the preparation of the Au NP solution containing salt was sensitive to spikes in the salt concentration. These spikes led to aggregation of the Au NPs and non-specific deposition of Au NPs on the substrate. The Au NP patterned surfaces were immersed in a sodium hydroxide solution in order to lift-off the patterned Au NPs, but no lift-off was observed without adequate physical agitation. The van der Waals forces are too strong to allow for lift-off despite the absence of electrostatic forces.

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Integration of Nanowire Devices in Out-of-Plane Geometry

Cited by 23 publications

References 45 publications

Tunable Assembly of Gold Nanoparticles on Nanopatterned Poly(ethylene glycol) Brushes

Tunable Assembly of Gold Nanoparticles on Nanopatterned Poly(ethylene glycol) Brushes

Biomimetic Radial Tandem Junction Photodetector with Natural RGB Color Discrimination Capability

Directed self-assembly of nanogold using a chemically modified nanopatterned surface

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