Study of Effect TiO2 Thin Film Morphological on Polyaniline/TiO2 Solar Cell Efficiency AMER N. J AL-DAGHMAN Abstract In this work study preparation, structural, optical and electrical properties of polyaniline (PANi), nanocrystalline TiO2 and PANi: TiO2 nanocomposites. The TiO2 powder of particle size 50-60 nm was synthesized by sol-gel technique and