Methods to determine the agglomerated–amorphous ratio of P3HT in P3HT:PCBM solar cell mixtures, and control the degree of agglomeration–crystallinity of P3HT in the final device using a solvent mixing method and no further heat-treatment or preparation of the polymer are presented. As-cast devices have an efficiency of ∼4%.
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Moulé et al. (2007) studied this question.
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