The influence of blocking layer on the photovoltaic performance of organometal halide perovskite solar cell

The existence of a compact electron blocking layer is critical in organometal halide perovskite solar cell, since it prevented the charge recombination originated in fluorine-doped tin oxide (FTO) electrode and the hole conducting layer and ensured an effective charge abstract. A compact TiO₂ thin film was fabricated on FTO by spin coating different sols. Commercial peroxo titanic acid (PTA) aqueous sol and titanium isopropoxide (TTIP) sol prepared according to literature were used to regulate the performance of the compact layer. With the optimized blocking layer a PCE of 5.15% was archived with P3HT as hole-transport material (HTM) and magnetron sputtering Ag as counter electrode.