BTO Nanocomposite Thin Films Deposited via Aerosol Assisted Chemical Vapor Deposition for Perovskite Solar Cells*

Perovskite solar cell technology is the fastest-advancing solar technology to date. The power conversion efficiency of perovskite solar cells increased from 3.13 % in 2009 to 22.1 % within 6 years. Organolead halide perovskites, specifically methylammonium lead iodide chloride, (CH3NH3PbI3-xClx) is a promising candidate to harvest solar energy. Ferroelectrics can be exploited to reduce bimolecular recombination because spontaneous electric polarization associated local internal electric fields can be used to reduce charge carrier recombination hence photo current density can be enhanced. In this work, we explore structural, optical, and ferroelectric properties of CH3NH3PbI3-xClx: BTO (a well-known ferroelectric material) nanocomposite thin films fabricated via the process of Aerosol Assisted Chemical Vapor Deposition (AACVD). Structural and optical measurements demonstrate as BTO concentration increases in the composite thin films, the crystallinity and optical absorption of composite thin films decrease. The perovskite grain size in the composite decreases as well. Structural, optical, and ferroelectric characterization of CH3NH3PbI3-xClx: BTO nanocomposite thin films fabricated at different BTO nanoparticle concentrations will be presented.