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Increasing the Efficiency of Solar Cells Through the Redesign of the Cell Structure and the Addition of A Sensorless Solar Tracker

jalil Sarghaleh, Arsalan | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57335 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Kavehvash, Zahra
  7. Abstract:
  8. In this thesis, the efficiency of energy conversion in solar cells has been enhanced through the use of an innovative structure combining a wideband plasmonic solar absorber (UWB), quantum dots (QDs), and an intermediate band (RB-IBSC). The QD structure has been integrated with a plasmonic array and optimized accordingly. Although the conventional QD structure is effective in improving solar cell efficiency, it has two fundamental issues. Firstly, the short carrier lifetime, which has been addressed by adding the RB-IBSC band. The key concept behind RB-IBSCs involves creating a structure that facilitates electron movement more effectively in one direction than in the other. By asymmetric tunneling, the recombination rate is reduced, resulting in an overall increase in cell efficiency. The second limitation of quantum dots or quantum emitters is the reduced photon absorption rate entering the cell, which is improved using plasmonic nanoparticles or optical nanoantennas. The coupling of plasmonic particles and QDs enhances their absorption coefficient. Furthermore, the proposed absorber surface pattern is obtained through an optimization algorithm. The quantum efficiency measurements have been accurately validated to ensure the precision of the results. Subsequently, these methods are applied in Finite-Difference Time-Domain (FDTD) simulations. FDTD simulations show that the solar cell efficiency reaches 43.52%, and the open-circuit voltage reaches 1.4 volts. To further increase solar cell efficiency, two types of sensorless mechanical trackers for tracking the solar radiation angle and a Maximum Power Point Tracking (MPPT) system based on reinforcement learning have been designed and implemented. These sensorless tracking systems optimize the solar cell efficiency to the best possible state
  9. Keywords:
  10. Maximum Power Point Tracking (MPPT) ; Intermediate Band Solar Cell ; Plasmonic Solar Cell ; Quantum Dot ; Reinforcement Learning

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