Silicon nanowires for network photodetectors and plasmonic applications

Download

index.pdf

Date

2013

Author

Mülazımoğlu, Emre

Metadata

Show full item record

Item Usage Stats

138
views

67
downloads

Being the key component of the semiconductor industry, silicon in nanowire form has gained increased attention. In this thesis, vertical arrays of silicon nanowires (Si NWs) have been fabricated with metal assisted etching method (MAE). MAE method is a simple, solution based and low temperature process. In this method, fabricated nanowires inherit the starting wafer characteristics, such as doping type, density and crystal orientation. In the first part, fabricated NWs in network form have been demonstrated as the active layer in metal-semiconductor-metal photodetectors. Devices showed partial transparency and fully reversible switching behavior. Moreover, fast dynamic response has been obtained with 0.43 milliseconds for the rise time and 0.58 milliseconds for the fall time. Flexible PDs were fabricated on polyethylene-terephtalate substrates and operational during bending up to a radius of 1 cm. In the second part, surface plasmon resonance properties of the silver (Ag) nanoparticle decorated Si NWs have been investigated. Si NWs were fabricated through one-step and two-step MAE method. Two-step MAE method involved the use of hydrogen peroxide. Ag nanoparticles were decorated onto Si NWs through simple evaporation and annealing processes. The hydrogen peroxide in MAE method was found to degenerate the surface of nanowires and created oxygen defects. Defects enhanced infrared absorption at higher frequencies and led to emission of light by radiative recombination. Almost 50-fold enhanced localized-surface-plasmon-resonance (LSPR) was obtained. It was attributed to the change in the dielectric constant of effective medium. LSPR wavelength could be tuned by changing Ag particle size and NW length.

Subject Keywords

Nanosilicon., Nanowires., Nanostructured materials., Optical detectors., Semiconductors

URI

http://etd.lib.metu.edu.tr/upload/12616071/index.pdf
https://hdl.handle.net/11511/22680

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Silicon nanostructures for electro-optical and photovoltaic applications Kulakcı, Mustafa; Turan, Raşit; Department of Physics (2012) Recently extensive efforts have been spent in order to achieve all silicon based photonic devices exploiting the efficient light emission from nanostructured silicon systems. In this thesis, silicon based nanostructures have been investigated for electro-optical and photovoltaic applications. The thesis focused on three application areas of silicon nanostructures: Light emitting diode (LED), light modulation using quantum confined Stark effect (QCSE) and photovoltaic applications. In the context of LED appl...
Synthesis of germanium nanowires by vapor transport and fabrication of fully transparent flexible photodetectors Aksoy, Burcu; Ünalan, Hüsnü Emrah; Department of Metallurgical and Materials Engineering (2012) Nanomaterials are widely investigated by researches and because of their unique properties they have been utilized in many different devices. Nanowires are one of these materials which show deviated mechanical, chemical, physical and optical, properties from their bulk counterparts. These deviations in properties of the nanowires are based on both their high surface to volume ratio and quantum confinement effect. Lately optical properties of nanowires have received great attention as they also exhibit good ...
Nonlinear compressible finite viscoleasticity of epoxy-based polymers Dal, Hüsnü; Gromala, P. J.; Han, B. (2019-01-01) Epoxy-based polymers are widely used in the semiconductor industry as thermal and/or electrical interfaces and as encapsulating material. In the automotive industry, epoxy-based molding compounds (EMCs) are often used to protect not only the single IC packages but also the entire electronic control units (ECUs) (or the power modules). The stress caused by the mismatch of the coefficient of thermal expansion (CTE) between EMC and adjacent materials is one of the major causes for premature failure. In the tem...
Optical characterization of CuIn5S8 crystals by ellipsometry measurements IŞIK, MEHMET; Gasanly, Nizami (2016-04-01) Optical properties of CuIn5S8 crystals grown by Bridgman method were investigated by ellipsometry measurements. Spectral dependence of optical parameters; real and imaginary parts of the pseudodielectric function, pseudorefractive index, pseudoextinction coefficient, reflectivity and absorption coefficients were obtained from the analysis of ellipsometry experiments performed in the 1.2-6.2 eV spectral region. Analysis of spectral dependence of the absorption coefficient revealed the existence of direct ban...
Hydrothermally grown zinc oxide nanowires and their utilization in light emitting diodes and photodetectors Ateş, Elif Selen; Ünalan, Hüsnü Emrah; Department of Metallurgical and Materials Engineering (2012) Zinc oxide, with its direct wide bandgap and high exciton binding energy, is a promising material for optoelectronic devices. Quantum confinement effect and high surface to volume ratio of the nanowires imparts unique properties to them and makes them appealing for researchers. So far, zinc oxide nanowires have been used to fabricate various optoelectronic devices such as light emitting diodes, solar cells, sensors and photodetectors. To fabricate those optoelectronic devices, many different synthesis metho...

Citation Formats

E. Mülazımoğlu, “Silicon nanowires for network photodetectors and plasmonic applications,” M.S. - Master of Science, Middle East Technical University, 2013.