“…Among the currently used organic materials, pentacene (C 22 H 14 ) is proved to be a promising candidate for solar cells [1][2][3][4][5], thin film transistors [6][7][8], photo detectors [9] and memory devices [10][11][12] due to its polycrystalline morphology, large carrier mobility, small optical band gap, long exciton diffusion length and strong absorption in the visible region of solar spectrum. Pentacene is an organic semiconductor consisting of five p-conjugated aromatic benzene rings as shown in Fig.…”