A semiconductor package includes a lower semiconductor chip having a lower semiconductor substrate and upper pads on a top surface of the lower semiconductor substrate, an upper semiconductor chip stacked on the lower semiconductor chip, the upper semiconductor chip including an upper semiconductor substrate and solder bumps on a bottom surface of the upper semiconductor substrate, and a curing layer between the lower semiconductor chip and the upper semiconductor chip, the curing layer including a first curing layer adjacent to the upper semiconductor chip, the first curing layer including a first photo-curing agent, and a second curing layer between the first curing layer and the top surface of the lower semiconductor substrate, the second curing layer including a first thermo-curing agent.