The present invention relates to an organic solar cell having an enhanced light efficiency by using an organic/inorganic nanocomposite in which a metal nanorod and an electron acceptor are self-assembled, in a photoactive layer, and a method of preparing the same. According to the present invention, since the metal nanorod and the electron acceptor are self-assembled, separated electrons are easily transported, and since electron transport via a metal is easier than that via an organic material, the electron transport speed via the metal nanorod of the present invention is faster than that via a related art organic material. Therefore, the organic solar cells of the present invention can increase the charge mobility within the photoactive layer to enhance the photoconversion efficiency.
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