الفهرس 
Renewable EnergyOnly 14 pages are availabe for public view
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Abstract
Abstract
In this thesis, the optical and electrical characteristics of modified nanopyramid grating silicon solar cells (SCs) are numerically reported and analyzed. The modified grating SC consists of an upper tapered nanopyramid and a lower nanorectangular part. The geometrical parameters of the proposed design are tuned to maximize the optical absorption and hence the ultimate efficiency. The finite-difference time-domain and finite-element methods are utilized via Lumerical software packages for studying the optoelectronics performance of the suggested design. In this investigation, short-circuit current density (Jsc), optical generation rate, open-circuit voltage (Voc), electrical fill factor, and electrical power conversion efficiency (PCE) are calculated thoroughly. Moreover, the effects of the doping concentration and carrier lifetime on the device performance are investigated. The modified design provides an optical ultimate efficiency of 40.93% and optical Jsc of 33.49 mA/cm2, respectively, with an improvement of 28.3% over the conventional nanopyramid SC. This enhancement is due to the ability of the grating sidewalls to trap more light through the active layer. Additionally, the spacing between the adjacent nanopyramid structures exhibit microcavity resonance, which contributes to light broadband absorption enrichment. The p-i-n axial doping of the proposed SC exhibits Voc of 0.57 V, Jsc of 28.42 mA∕cm2, and PCE of 13.3%, which are better than the Voc of 0.559 V, Jsc of 19.6 mA∕cm2, and PCE of 8.95% of a conventional nanopyramid SC.
In this thesis, Chapter 1 gives a brief introduction for energy world consumption
Chapter 2 introduces an overview of the physics principles of solar cells. Optical and electrical characteristics of solar cells are represented. Solar cell generations and their efficiency are examined. Moreover, Light trapping techniques in silicon nanostructured solar cells are reported.
Chapter 3 describes simulation and analysis of solar cell structures. The formulation of the FDTD and the electrical simulator are discussed. The advantages of the numerical method are considered. In addition, a literature review about nanostructured solar cell is represented.
Chapter 4 discusses an overview of the major common numerical modeling techniques used in studying the proposal design. The optical properties of the proposed silicon nanostructured design solar cell are discussed and analyzed. Also, the electrical characteristics of the suggested design are presented.
Chapter 5 shows the conclusion of the presented research work and the future work linked to the topic of this thesis.