Conductivity of Composite Films Based on Conductive Polymer PEDOT:PSS, Graphene Oxide and Nanoparticles TiO2 for Contact Layers of Perovskite Photovoltaic Structures

摘要

The electrical properties of composite films based on conductive polymer PEDOT: PSS, graphene oxide (GO), and titanium dioxide nanoparticles (TiO2) (PEDOT: PSS- TiO2 and GO-TiO2) used as contact layers of organic and perovskite photovoltaic structures have been studied. As a result of the study of morphology by atomic force microscopy, it was found that the PEDOT: PSS-TiO2 and GO-TiO2 films have a globular structure with a grain size of similar to 200-300 nm. The current-voltage characteristics of the PEDOT: PSS-TiO2 and GO-TiO2 films are measured in the temperature range of 80-300 K, the dependences of the resistivity versus temperature, (T), which have an activation character, are obtained. It is established that as the temperature decreases, the (T) dependences show a transition from large values of the activation energy (570 meV and 329 meV) to lower values (25 meV and 2.2 meV) for the PEDOT: PSS-TiO2 and GO-TiO2 films, respectively. The mechanisms of transport of charge carriers in the materials studied are discussed.