Carbon-based perovskite solar cells (PSCs) have received widespread attention due to their low cost and high stability. The carbon electrode prepared by the doctor blade method easily forms defects at the interface between the perovskite layer, thereby reducing its photoelectric conversion efficiency (PCE). In this study, an easily deformable Co-Ni alloy@carbon aerogel was added between the carbon electrode and the perovskite layer via the grinding process, thereby effectively improving the interface quality and hole transporting ability. Correspondingly, the open-circuit voltage and fill factor of the hole-transport-material-free PSCs were significantly improved. A PCE of 12.71% was achieved, but it decreased to 10.77%, which remained at 86%, after 1296 h in the air. Chronoamperometry, Nyquist characterization, and capacitive effect were used to explain the cause of the hysteresis in the PSCs in detail.