Effect in the power conversion efficiency in inverted P3HT organic solar cells doped with nano-germanium sulfide

Herein, the inverted hybrid solar cells were fabricated with the configuration of FTO/TiO 2 /PFN/P3HT:PC 61 BM:GeS 2 /MoO 3 /Ag. According to our research, it is the first time that nanoparticles of germanium sulfide (GeS 2 ) have been added into a poly(3-hexylthiophene-2,5-diyl)-based inverted organic solar cell that is also free of ITO by using FTO instead. Some optical and electrical properties were obtained, through UV–Vis spectrum, Raman, J–V curves, quantum efficiency curves and impedance, among others, in order to verify the influence of the addition of GeS 2 in the active layer. From this it was found that GeS 2 , in the polymeric active layer based on P3HT, can improve the energy conversion efficiency in the cell with the configuration showed, reaching an efficiency of 4.20% when 1.00wt% of germanium sulfide was added, in contrast to the efficiency of 3.32% achieved without said compound. Graphical Abstract Solar cell squematic representation with the configuration FTO/TiO 2 /P3HT:PC 61 BM:GeS 2 /MoO 3 /Ag