Güneş pilleri için metal nanoparçacık plazmonik uygulamaları

In today's economy, need for development in energy is essential. Solar energyis safe, and at the same time is one of the cleanest, cheapest choices of energyalternative to fossil fuels. In this perspective, using the sun light eectively is infundamental importance. One of the problems, because of the indirect band gapof the material Si, is small energy conversion ratios of various solar cell structuresand limited absorption of red light. Because of the material properties, Si cellscannot absorb red light, which contributes great amount of the sun light. Oneof the recent developed techniques to use red light is using metal nanoparticles(MNP) embedded in a semiconductor medium as sub-wavelength antennas orMNP scatterers, hence increasing the eective path length of light in the cell.Absorption and scattering are mostly in plasmon resonances. Shifting theplasmon resonance peaks is possible by changing various parameters of the system like the size of the MNPs. In this work, Finite-Dierence Time-Domain(FDTD) method is used to analyze various systems worked. Mainly the MEEPpackage, developed at MIT, is used to simulate systems and other codes, relatedto analytical work, have also used to compare results. The plasmon resonances ofvarious sizes of Ag MNPs embedded in dierent mediums at dierent positionsare analyzed. Critical parameters like particle size, shape, dielectric medium, lmthickness are discussed for improved solar cell applications.Keywords: Solar Cells, Plasmonics, metal nanoparticles, Ag nanoparticles,FDTD, MEEP, Drude, Lorentz..