Ternary blends of poly(3-hexylthiophene): [6,6]-phenyl C61-butyric acid methyl ester (P3HT:PC61BM) and the insulating bulk polymers high-density polyethylene (HDPE), isotactic- and atactic polystyrene (i-PS, a-PS), are investigated. Addition of up to ≈50 wt% of the electronically inert, semicrystalline HDPE and i-PS to the organic semiconducting system does not significantly degrade the performance of photovoltaic devices fabricated with these ternary blends.
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