Formation of Silicon Nanoparticles From Porous Silicon for LED Application

Moeini Rizi, Mansoure | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40345 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Taghavinia, Nima
  7. Abstract:
  8. Semiconductor nanocrystals act as a good luminescent layer in new coming electroluminescence devices. Research on luminescent devices based on nanocrystals such as silicon nanoparticles, has been progressed over the last decades. In this research, silicon nanoparticles have been synthesized from porous silicon layer that was created through an electrochemical process. The effective luminescent parameters like electrolyte contents, current density and reaction time have been investigated. The maximum luminescence has been captured when the current density and reaction time were adjusted at 30 and 20 min, respectively. In addition, volume ratio Ethanol:HF 14:8 was another modified parameter to generate maximum luminescence. The optimum porous layer was separated from the silicon wafer and dispersed in dichloromethane or chloroform by using ultrasonic waves to produce silicon nanoparticles, which were applied in the fabricated hybrid light emitting diode. In this research, the single layer hybrid light emitting diode consists of silicon nanoparticels and Poly Vinyl Karazole (PVK) solution, which were spin coated on the indium tin oxide substrate. Silicon-PVK aspect ratio 0.1:1, 0.3:1, 0.6:1 and 0.9:1 mg:ml were selected that just second one shows high electroluminescence at 700 nm, the characteristic of silicon nanoparticles.
  9. Keywords:
  10. Porous Silicon ; Luminescence ; Silicon Nanoparticles ; Hybridlight Emitting Diodes

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