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Simulation of Graphene Nanoribbon based Photodetector

Faramarzi, Vahid | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45084 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Faez, Rahim
  7. Abstract:
  8. In this work, we have simulated graphene nanoribbon based photodetector and impact of changing the width, and Boron-Nitride doping and Stone-Wales defects on the optical properties of GNR has study. The energy band structure of GNR with nearest-neighbor approximation in a tight binding model calculated. To correspond with experiment and accuracy, we need to consider the impact of third nearest neighbors and edge bond relaxation. By Using the band structure, we calculated joint density of state and optical matrix elements and obtain inter band selection rule for A-GNR and Z-GNR. Then, using the Fermi’s golden rule, we investigate optical properties of GNR such as optical conductivity and dielectric response function. In further, the effect of the Stone-Wales defect in the GNR and also substituting B-N lattice with carbon atoms in the A-GNR (A_BN/GNR structure) on the optical properties of photodetector has been study. Absorption and electron transport from the valance band to the conduction band in a number of cases has been studied and compared. According to the results of simulations, the presence of defect and adding impurities of B-N in the metallic A-GNR, can increase the number of allowed transition and thus photon absorption occurs in a wider spectrum. In addition, the carrier transport at lower radiation energy range (IR energy range) increases
  9. Keywords:
  10. Photodetector ; Graphene Nanoribbons ; Stone-Wales Defect ; Tight Binding Method ; Fermi's Golden Rule

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