Enhancement in the efficiency of an organic-inorganic hybrid solar cell with a doped P3HT hole-transporting layer on a void-free perovskite active layer.

Significant enhancement in the power conversion efficiency of an organic-inorganic hybrid solar cell was achieved by the use of suitably doped poly(3-hexylthiophene-2,5-diyl) (P3HT) spin coated on a 99.5% void-free perovskite layer prepared on a TiO_x electron-transporting layer. The 9.2% device efficiency with pristine P3HT was increased to 12.4%. [ABSTRACT FROM AUTHOR]