Abstract: In this study,a strategy of hole transport layer-free（HTL-free）is proposed. The self-assembled monolayer is used as the additive of perovskite active layer,then the perovskite film is directly deposited on the conductive substrate surface using a one-step spin coating method,and the quality and uniformity of the film are improved. Furthermore,the method is applied to the commercial and low-cost diamond-wire sawn with high surface roughness,resulting in the formation of a perovekite film characterized by high coverage,dense morphoogy,and absence of cavities. In terms of the photoelectric performance,the single-junction perovskite solar cells yield a champion power conversion efficiency（PCE）of 21.3%,with a high fill factor（FF）of over 83%. Finally,a PCE of 28% for perovskite/silicon tandem solar cells based on diamond-wire sawn is demonstrated.