Electronic processes at the interfaces between photoactive layers and TiO x buffer layers in organic solar cells

The effect a layer of TiOx located between a photoactive layer and a metallic Al electrode has on the photovoltaic properties of an organic solar cell based on P3HT:PC70BM polymer is studied. The optimum thickness of the TiOx layer at which the efficiency of the solar cells is highest and the TiOx layer ensures the transfer of electrons from the photoactive polymer layer to the electrode while blocking vacancies is found to be 10 nm. The effect oxygen has on electronic processes during the operation of the photovoltaic cell is discussed.