The invention discloses a regular oblique parallelepiped-shaped Pb-MOF crystal. The regular oblique parallelepiped-shaped Pb-MOF crystal contains Pb, C and O elements, and concretely contains, by atomquantity, 5-10% of Pb, 55-60% of C and 35-40% of O; and the side length of the bottom regular hexagon of the Pb-MOF is 5-10 nm, the height of the parallelepiped is 1-3 nm, an angle between the oblique side surface and the bottom surface is 40-60 DEG. The invention also discloses a regular oblique parallelepiped-shaped halo ring-containing SP-MOF crystal. The SP-MOF crystal contains the Pb, C, N,and O elements, and concretely contains, by atom quantity, 1-5% of Pb, 75-80% of C, 3-5% of N and 15-20% of O, the side length of the bottom regular hexagon is 1.2-1.5 [mu]m, the height of the parallelepiped is 0.7-1 [mu]m, an angle between the oblique side surface and the bottom surface is 40-60 DEG, and a halo ring with a width of 50-60 nm exists in the periphery of the crystal. The SP-MOF can be applied to the hole transport layer of a perovskite solar cell in order to improve the moisture resistance and the photoelectric conversion efficiency of the cell.