Tetra methyl substituted Cu(II) phthalocyanine as alternative hole transporting material for organometal halide perovskite solar cells

â¿¢Tetra methyl substituted copper phthalocyanine as alternative hole transporting material.â¿¢Application to organometal halide perovskite solar cells.â¿¢Comparison with unsubstituted copper phtalocyanine.â¿¢Enhancement of Q band transitions due to more successful packaging.