Please use this identifier to cite or link to this item: http://repository.aaup.edu/jspui/handle/123456789/2638
Title: Nanostructured light-trapping interfaces for high efficiency photovoltaics رسالة ماجستير
Authors: Najem, Asma Ahmad$AAUP$Palestinian
Keywords: optical measurments,semiconductor,light trapping
Issue Date: 2020
Publisher: AAUP
Abstract: We integrate advanced light-trapping plasmonic interfaces consisting of gold nanoparticles of sizes (150—200 nm( to a cadmium selenide )CdSe( absorber using a carbon dioxide )SiO) spacer layer, to measure photocurrent enhancement in the absorber. The gold nanoparticles are processed by the self-assembled dewetting technique, where a thin (15 nm) Au film is sputtered on a glass substrate and annealed at temperatures of 400 and 500 °C in sub atmospheric pressure for annealing times of 30 and 60 minutes. Scanning Electron Microscope (SEM) are used to verify the dewetting of gold on into the appropriate size of nanoparticles, optical reflectance and transmittance to characterize localized surface plasmon resonance, and enhancement in photocurrent in the absorber to verify preferential scattering. The measurements are repeated for different SiO2 spacer layer thicknesses of 0, 15, 30, 45 nm between the nanoparticles and the absorber. This study investigates the dependence of optical trapping on the distance of the interface from the absorber film. The CdSe is used as the absorber due to its high photosensitivity and its high refractive index relative to that of most materials used in the plasmonic interface to optimize scattered by the interface preferentially into the CdSe absorber. A significant photocurrent improvement was obtained in the CdSe absorber using Au nanoparticles integrated to al50 nm CdSe absorber using an SiOz spacer thickness of 15 nm. The energy band gap for CdSe was verified to remain essentially constant at about 2.5 eV for all samples with different interfaces indicating that the increase in the photoelectric current is due to localized surface plasmon resonance (LSPR).
Description: Master’s degree in Physics
URI: http://repository.aaup.edu/jspui/handle/123456789/2638
Appears in Collections:Master Theses and Ph.D. Dissertations

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