Easily fabricated, directly transferred thin nanoporous gold was first used as a back electrode for hole-transport-material-free perovskite solar cells. In order to infiltrate CH₃NH₃PbI₃ into the pores of mesoporous layers and the nanoporous gold back electrode, three ways, namely one-step spin-coating deposition, sequential deposition, and two-step spin-coating deposition were introduced to fabricate CH₃NH₃PbI₃. The devices containing well infiltrated CH₃NH₃PbI₃ show the highest power conversion efficiency of 7.99%.