THE EFFECT OF MOLYBDENUM DISULFIDENANOPARTICLES ON THE PROPERTIES ZINC OXIDE ELECTRON TRANSPORT LAYER OF ORGANIC SOLAR CELLS

Abstract

In this work, the effect of molybdenum disulfidenanoparticles on the properties zinc oxideelectron transport layer of organic solar cells is studied. molybdenum disulfidenanoparticles were obtained by laser ablation of MoS2 powder in isopropyl alcohol. To form composite films, nanoparticles were added to a sol–gel zinc oxidesolution with different concentrations.According to scanning electron microscope study, as the concentration of nanoparticles in the film increases, the thickness of the molybdenum disulfidelayer on the zinc oxide surface changes. molybdenum disulfidenanoparticles in the film structure gradually fill the bulk and surface voids inzinc oxide. However, when the concentration exceeds 1%, holes and voids are formed in the film. The absorption spectra of composite films showed that as the concentration of nanoparticles in the film increases, the absorption intensity enhances due to theincrease of the overall thickness. At the same time, zinc oxideoptical band gap width doesnot change, which means the molybdenum disulfidenanoparticles do not affect the electronic structure of zinc oxide. It was shown that the observed changes in the volt-ampere characteristicof organic solar cells with composite films electron transport layer composite films was associated with the influence of molybdenum disulfidenanoparticles on electron transport in organic solar cells.According to impedance spectroscopy study, it was found that molybdenum disulfidenanoparticles at concentration below critical value increases the lifetime of charge carriers and the diffusion coefficient in composite film.