The high-temperature fabrication process for fully printable perovskite solar cell (PSC) limits its synchronization passivation with device fabrication. Herein we have creatively developed a post-decoration process (PDP) using phenyl-C-61-butyric acid methyl ester (PCBM) in chlorobenzene anti-solvent, which not only induces the regrowth of perovskite crystals reducing grain boundaries, but also realizes the relaying delivery of excited state electrons from perovskite to TiO2 in virtue of the ultra-thin PCBM/perovskite heterojunction. The champion device with PCBM achieved a power conversion efficiency of 14.12% with an open circuit voltage of 0.91 V, a current density of 24.03 mA/cm(2) and a fill factor of 0.64. It provides a simple approach towards high efficiency without sacrificing long-term stability of fully printable perovskite solar cells.