عدنان فالح حسن الدحيدحاوي

Abstract A method was proposed to construct a luminescent solar concentrator (LSC) by using a Pyranine dye. it's organic dye , fluorine and sensitive to light. The efficiency of silicon solar cell was measured before and after using the (LSC). Significant improvement was noticed in the solar cell efficiency (η) Where the increase was of efficiency from (0.619) to (2.192). and also, the (absorption & fluorescence), stokes shift (Δη), radiated lifetime (τfm) , fluorescence lifetime (τf) and quantum efficiency (Qfm) was calculated.

AuramineO is fluorined organic and sensitive for light,has been chosen in this workdissolved in ethanol liquid. The Ethanol did not effected onAuramineO absorption because the absorption of Ethanol drop and approaches to zero in the visible spectrum region .After studying the spectroscopic properties of AuramineO dye ,it showed that it have wide range of absorptionspectra and high fluoridation.So the relative intensity of both absorption and fluorescespectra were increasedbyincreasing concentrationto a certain extent andthus compatible with Beer- Lambert law. Accordingly we could determine the highest absorption and fluorescence of each concentration and calculated molar absorptioncoefficientes ,quantum efficiency , radiated lifetime, fluorescence lifetime and stokes shift . These panelsofAuramineO dye were used as concentrators for solar cell and all their panels are infallible improving and raies the efficiency of solar cell at ratio spotty.Measuresof the thickness for the panelsshowed they effect on the efficiency solar cell that the thicknessof panels if increase thesolar cell efficiency decrease, therefore it is preferred using little thickness.

n this research we choose the design of Dipole nanoantenna with the adoption of finite difference time domain method. The design result of 0.55μm optical antenna and its performance are presented. The optimal parameters are: [Gap=(10, 15, 20, 25, 30)nm & Length=(200, 240, 280, 320, 360)nm]. The influence of the geometrical parameters (gap dimension , nanoantenna length) on the antenna field enhancement and spectral response is discussed. We found the field enhancement be bigger when the gap be very small at dipole nanoantenna, where in the Gap=10nm the field enhancement more than in the Gaps (15, 20, 25, 30)nm.

A new design for increased power extraction for NanoSatellites is proposed, which is used for KufaSat. This proposed design contains four expandable panels with additional sixteen solar cells, two solar cells on each side of panel. The proposed design with additional panels and how these additional panels are assembled to the body of KufaSat and how they are deployed after the launching are presented. Comparison between original design and proposed design in addition to discussion the increasing in power production and charge current are included.