Enhanced charge carrier transport in spray-cast organic solar cells using solution processed MoO3 micro arrays

Abstract

A toward all spray fabrication routine was used to fabricate organic solar cells (OSCs), in which a molybdenum oxide (MoO₃) micro array was directly deposited on the active layer, and the influence of the hole transporting property on the OSC performance was studied. The component and morphology of the MoO₃ array as well as the effect on OSCs performance has been investigated. By using the solution processed MoO₃, we obtained a 62.7% enhancement to 3.4% in PCE compared to the non-MoO₃ device base on the P3HT system. Photovoltaic measurement and impedance analysis indicated that the MoO₃ micro array has modified the interface between the electron donor and anode. By improving the ratio of the precursor solvent, the carrier transport performance was further improved. This approach significantly enhances our understanding of the application of MoO₃ micro arrays in all-sprayed OSCs, and indicating that this simple method has good prospects for the handy commercial fabrication of OSCs.