Micro-Concentrated Photovoltaics Based on Cu(In,Ga)Se2 Microcells: An Optical Study

Micro-concentrated Cu(In,Ga)Se2 (μCPV-CIGSe) solar cells offer the potential to reduce the consumption of raw materials to a great extent while maintaining high efficiencies. A theoretical model of μCPV-CIGSe solar cells, consisting of hexagonally spaced micro-CIGSe solar cells embedded in the low-index dielectric matrix and micro-sized lenses placed right on top, is proposed for optical study. It is discovered that micro-lenses enable to effectively concentrate the incident light due to the inherent nanojet phenomenon, and the μ-CIGSe absorbers trap the penetrated light within absorbers arising from wave-guided modes. The two effects co-contribute to an optimized absorption for μCPV-CIGSe solar cells with a μ-CIGSe absorber diameter of 800 nm and a pitch of 1500 nm. Short-circuit current density reaches 36.5 mA/cm2 and accounts for 98.8% compared to their plain counterparts without lenses, corresponding to an absorber material saving by a factor of 3/4. Notably, a large contacting area between lenses and CIGSe solar cells are recommended for an improved angular tolerance. Those findings will recommend design principles for further experiments.

Characterization and Theoretical study of Nonlinear Optical Properties of (2E)-1-(2, 4-dichlorophenyl)-3-(4-methylphenyl) prop-2-en-1-one

The structural confirmation of the title compound is done by theoretical and experimental study. Experimental techniques such as FTIR, proton NMR, UV-Visible, thermal analysis (TGA & DTA) are employed. Density functional theory is used to analyze spectroscopic data scrutinized. Second order nonlinear optical parameters are obtained. The experimental results are analyzed with theoretically obtained data from density functional theory. TD-DFT also employed for the MLDCLC at different basis set. Keywords: DFT Study, nonlinear optical study, FTIR, 1H NMR