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Study of Surface Modified Silicon Nanoparticles for Printable Optoelectronics
The main objective of the present work is to study the influence of etching and surface functionalization on the optical, electrical and dispersion properties of silicon nanoparticles (Si-NPs) for printable optoelectronic applications. The synthesis of Si-NPs is carried out in a gas-phase microwave plasma reactor via pyrolysis of SiH4. The native oxide layer, covering the surface of as-synthesized Si-NPs after handling in air, is removed by etching them with HF. The surface of Si-NPs is terminated with organic molecules by surface functionalization of freshly etched particles with n-alkenes. Silicon nanoparticles in the size regime of 6 nm and below exhibit photoluminescence (PL) in the visible due to quantum size effects. Etching of as-synthesized Si-NPs with HF increases their photoluminescence intensity and causes a weak blue shift in their luminescence spectrum. During the etching of Si-NPs with a mixture of HF and HNO3, the PL emission can be tuned from red to green by increasing the etching time, whereas blue emission is obtained after the re-oxidation of orange luminescing etched Si-NPs. The freshly etched particles emitting in orange to red and yellow to green regime undergo blue and red shift in emission after their surface functionalization, respectively. The functionalized Si-NPs with different coverage of organic molecules on their surface show difference in the wavelength of their PL emission. The functionalized Si-NPs exhibit higher stability in air against re-oxidation compared to freshly etched Si-NPs. The particles functionalized with different organic molecules show different surface coverage and a difference in long-term stability in air. It is found that functionalization with dodecene exhibits a high long-term stability. The freshly etched Si-NPs show higher electrical conductivity compared to as-synthesized particles covered by a native oxide. The conductivity of etched Si-NPs in air decreases with time due to their surface oxidation. The surface functionalization of freshly etched Si-NPs ...
Study of Surface Modified Silicon Nanoparticles for Printable Optoelectronics
The main objective of the present work is to study the influence of etching and surface functionalization on the optical, electrical and dispersion properties of silicon nanoparticles (Si-NPs) for printable optoelectronic applications. The synthesis of Si-NPs is carried out in a gas-phase microwave plasma reactor via pyrolysis of SiH4. The native oxide layer, covering the surface of as-synthesized Si-NPs after handling in air, is removed by etching them with HF. The surface of Si-NPs is terminated with organic molecules by surface functionalization of freshly etched particles with n-alkenes. Silicon nanoparticles in the size regime of 6 nm and below exhibit photoluminescence (PL) in the visible due to quantum size effects. Etching of as-synthesized Si-NPs with HF increases their photoluminescence intensity and causes a weak blue shift in their luminescence spectrum. During the etching of Si-NPs with a mixture of HF and HNO3, the PL emission can be tuned from red to green by increasing the etching time, whereas blue emission is obtained after the re-oxidation of orange luminescing etched Si-NPs. The freshly etched particles emitting in orange to red and yellow to green regime undergo blue and red shift in emission after their surface functionalization, respectively. The functionalized Si-NPs with different coverage of organic molecules on their surface show difference in the wavelength of their PL emission. The functionalized Si-NPs exhibit higher stability in air against re-oxidation compared to freshly etched Si-NPs. The particles functionalized with different organic molecules show different surface coverage and a difference in long-term stability in air. It is found that functionalization with dodecene exhibits a high long-term stability. The freshly etched Si-NPs show higher electrical conductivity compared to as-synthesized particles covered by a native oxide. The conductivity of etched Si-NPs in air decreases with time due to their surface oxidation. The surface functionalization of freshly etched Si-NPs ...
Study of Surface Modified Silicon Nanoparticles for Printable Optoelectronics
Gupta, Anoop (author) / Schulz, Christof
2011-10-20
Theses
Electronic Resource
English
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