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We propose the solvent-vapor annealing (SVA) as an efficient method for the formation of large [6,6]-phenyl C61 butyric acid methyl (PCBM) single crystals.We compared the results in different conditions by changing the organic solvent of SVA and the substrates,showing that we can change the morphology of PCBM crystals by tuning the parameters of the annealing solvent.