The hybrid solar cells (HSCs) are most widespread solar cell structures among the researchers. Including nanostructure patterns in HSCs enhances its capability of trapping of light with broad range of absorption wavelength. In this chapter, we have analyzed the proposed PEDOT:PSS/c-Si HSCs with single and dual nanostructure with FDTD method by using FDTD Solutions and DEVICE software of Lumerical Inc. packages. The optical Jsc for each type of nanostructure-based HSC designs are obtained as 35.91 mA/cm2 for single nanostructure-based HSC, like nanopyramids (NPs) and 36.47 mA/cm2 and 40.94 mA/cm2 for combined nanostructures like NP with Ag metal nanoparticles (MNPs) and NP with Al MNP, respectively. The electrical Jsc for the above structures are 23.66 mA/cm2, 22.42 mA/cm2, and 21.17 mA/cm2, respectively. Among all these structures, HSCs with NP + Ag MNPs and MoO3 coating achieved the highest open circuit voltage (Voc) of 1.1 V, power conversion efficiency (PCE) of 20.36% and fill factor (FF) of 82.56%.