Hybrid solar cells were fabricated by depositing monolayered ZnS nanoparticles on the ZnO layer of an inverted polymer solar cell via a spin assisted successive ion layer adsorption and reaction technique (spin-SILAR). The effects of ZnS layer on the photovoltaic performances of the hybrid solar cells have been investigated. Results show that solar cell device based on ITO/ ZnO/ ZnS QD/ P3HT/ PCBM/ Ag configuration with the area of 0.06 cm2 achieves enhanced device characteristic with an impressive PCE of 2.58% under 1 sun illumination (AM1.5) test conditions. It greatly outperforms a reference device (PCE=1.54%) based on an ITO/ZnO/P3HT/PCBM /Ag configuration without the ZnS interlayer. This ZnS QDs interlayer exerts multiple positive effects on the device performance, including improving light absorption, reducing charge recombination as a blocking layer which improves charge collecting efficiency.
