Abstract
We fabricated bulk-hetero junction organic solar cells based on 1,2- dichlorobenzene solutions of poly[[4,8-bis[(2- ethylhexyl)oxy]benzo[1,2-b:4,5-b′] dithiophene-2,6-diyl] [3-fluoro-2- [(2-ethylhexyl) carbonyl]thieno [3,4-b]- thiophenediyl] (PTB7): [6,6]-phenyl- C71-butyric-acid-methyl-ester (PTB7:PC71BM) with additional surfactants of diiodooctane (DIO) and dimethyl sulfoxide (DMSO). The weight ratios of DIO and DMSO relative to the total weight of PTB7:PC71BM were optimized to be 3% and 13%, respectively, and found that the solar cells with the optimized weight ratios of the DIO and DMSO additives exhibited an open circuit voltage of 0.72 V, short circuit current density of 15.63 mA/cm2, fill factor of 0.49, and power conversion efficiency of 5.47%. The significant structural changes were found from the surface morphology observation of the active layer as observed by atomic force microscopy.
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