NOVEL HYBRID ORGANIC-INORGANIC PEROVSKITE MATERIALS AND SOLAR CELLS

Abstract

Novel hybrid perovskites are prepared and investigated as light absorbers for fabrication of perovskite solar cells. High power conversion efficiencies of more than 18% are obtained with solar cells incorporating hybrid perovskites that are composed of mixed-organic cations and mixed halides; (CH3NH3)1-x(CH(NH2)2)xPbI3-yCly. It has been shown that perovskite solar cells with (CH3NH3)1-x(CH(NH2)2)xPbI3-yCly significantly outperform conventional perovskite solar cells incorporating CH3NH3PbI3, CH3NH3PbI3-yCly and CH3NH3PbI3-yBry as light harvesters. Furthermore, a novel two-dimesional hybrid perovskite material which consists of a conjugated polymer, protonated polyaniline, as the organic cation component is synthesized and characterized. It has been shown that self-assembly of the protonated conjugated polymer chains and PbI6 octahedra results in formation of two-dimensional hybrid perovskites. These findings show that many other conjugated polymers and macromolecules could be self assembled with a metal halide network in the same manner for the design of novel two-dimensional hybrid perovskites for a large variety of applications.