| Summary: | 碩士 === 國立聯合大學 === 光電工程學系碩士班 === 98 === In this article, we have improved the absorption characteristics of solar cells by surface plasmon resonance (SPR), increasing the photo-electric conversion efficiency of single crystal silicon solar cells. We obviously discovered that possess phenomenon of surface plasmon resonance since nano-metal thin films had been annealed; the resonance band of gold (Au) nanoparticles approximately at 500-750 nm, and the other is silver (Ag) nanoparticles which resonance band generally at 350-450 nm. In order to make wider the bandwidth of absorption, we combined gold and silver to form alloy thin films with different proportions. And after annealing process, we can obviously observe that has two absorption peaks of surface plasmon resonance in the spectrum, which resonance band is approximately at 350-600 nm that it was wider than the single metal nanoparticles of resonance band. It well greatly improves the absorption characteristics for solar cells.
According to increase the temperature of annealing, the absorption peaks are moved to long-wavelength also known as red-shift. The surface roughness of metal thin film is 0.10 nm without annealing, when annealed at 400℃ which surface roughness is 0.23 nm, surface roughness were measured by atomic force microscopy (AFM). And by use of scanning electron microscope (SEM), we have obviously discovered nano-metal thin films will become the metal nanoparticles. According to the result as the higher annealing temperature have larger nanoparticles size. We have deposited Au/Ag nanoparticles on surface of single crystal silicon solar cells by E-Gun evaporation. Find the conversion efficiency will enhance approximately 3.5%. As a result, we can confirm that the phenomenon of metal nanoparticles surface plasmon resonance can improve photo-electric conversion efficiency of solar cells.
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