Recent Progress in Perovskite Solar Cell: Fabrication, Efficiency, and Stability -- State-of-the-Art of Solution-Processed Crystalline Silicon/Organic Heterojunction Solar Cells: Challenges and Future -- Structure, Electronic and Charge Transfer Properties of Organic Photovoltaics from Density Functional Theory Methods -- Dye-Sensitized Solar Cells: A Brief Historical Perspective and Uses in Multijunction Devices -- Delving Charge-Transfer Excitations in Hybrid Organic-Inorganic Heterojunction of Dye-Sensitized Solar Cell: Assessment of Excitonic Optical Properties Using the GW and Bethe-Salpeter Green's Function Formalisms -- Promising DSSCs involving organic D-pi-A and similar structures for n- and p- type semiconductors - A Theoretical Approach -- Application of QSPR Modeling in Designing and Prediction of Power- Conversion Efficient Solar Cell -- Computational Screening of Organic Dye-sensitizers for Dye-sensitized Solar Cells: DFT/TDFT Approach -- Chemometric modeling of absorption maxima of carbazole dyes used in dye-sensitized solar cells.