There is provided a solar cell including: a substrate; an energy absorption layer formed on the substrate and having a plurality of nanowire structures, each of the nanowire structures including an n-type semiconductor and a p-type semiconductor joined together; and n-type and p-type electrodes electrically connected to the n-type and p-type semiconductors, respectively. The solar cell exhibits high photoelectric efficiency due to pn junction of the nanowire structures. Further, the solar cell can absorb light falling within a substantially whole range of solar spectrum and does not require an epitaxial growth process, thereby overcoming drawbacks of an epitaxial layer such as crystal defect.