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Enhancing Silicon Absorption with Metallic Nanoparticles: Small Particles, Big Hopes

This study investigates the enhancement of light absorption in silicon using metallic nanoparticles. The absorption spectra of silicon with particles on TiO2 and SiO2 coatings are analyzed, showing a significant increase in absorption at 1150nm. Localized surface plasmons in the nanoparticles play a crucial role in trapping and coupling light into silicon. The fabrication process involves oxidation, dielectric film deposition, silver film evaporation, and low-temperature annealing. The findings have promising implications for solar energy applications. (442 characters)

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Enhancing Silicon Absorption with Metallic Nanoparticles: Small Particles, Big Hopes

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  1. Fiona Beck Small Particles, Big Hopes: Absorption Enhancement in Silicon using Metallic Nanoparticles

  2. C ES Centre for Super Earth-saving Science

  3. Solar Energy Superheros Regular Superhero

  4. Absorption Spectra of Silicon Rubbish absorption above 1000nm % Absorption Wavelength (nm)

  5. Texturing to trap light in bulk silicon cells light SEM image of textured silicon taken by Luke Johnson

  6. - - - - - - - + + + + + + -e -e -e -e -e -e -e -e -e -e -e -e -e -e -e -e + + + + + + - - - - - - - Localised Surface Plasmons in Metal Nanoparticles E-field Incident Light Time t Timet + /2c

  7. Interface effects Incident light Silver Nanoparticle Dielectric layer Induced surface plasmon Light coupled into silicon in trapped modes

  8. Sample Fabrication: 1) Silicon wafer, thin and shiny Oxidation for SiO2 2) Dielectric film deposition ~30nm APCVD TiO2 3)Silver film evaporation ~10nm 4) Low temperature anneal ~260 degree C Nanoparticles !

  9. Smallest particles Biggest particles Resonance peaks

  10. Optical measurements Particles on front Light source Particles on rear SiO2 Coating TiO2 Coating

  11. Absorption Spectra for Particles on Silicon Absorption Spectra for Particles on Silicon

  12. Absorption Spectra for Particles on Silicon 16 fold increase in light absorption for particles on TiO2 at 1150nm 5.6 times more absorption of light at 1150nm for particles on the rear of a silicon-SiO2 sample

  13. SEM Images Particles on TiO2 Particles on SiO2

  14. With thanks to.. My supervisors Klaus Weber and Kylie Catchpole, currently at the Institute of Atomic and Molecular Physics in the Netherlands. Luke Johnson for the TiO2 deposition and the nice SEM image and everyone who has helped me out in the labs.

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