Anisole 1 Cobalt compounds 1 Conversion efficiency 1 Copper compounds 1 Cost effectiveness 1 Dopant-free 1 Free holes 1 Green synthesis 1 Hole mobility 1 Hole transport materials 1 Hybrid materials 1 Hybrid perovskite Low-costs 1 Organic solvents 1 Perovskite 1 Perovskite solar cells 1 Porphyrinoids 1 Propylene glycols 1 Solvent based 1 Zinc compounds 1 anisole 1 green synthesis 1 hybrid perovskites 1 porphyrinoids 1 propylene glycol 1