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The charged defect density in common π-conjugated polymers such as poly(3-hexylthiophene), P3HT, is around 1018 cm−3. Despite, or perhaps because of, this huge defect density, bulk heterojunction solar cells made from these polymers and a C60 derviative such as PCBM exhibit some of the highest efficiencies (∼5%) yet obtained in solid state organic photovoltaic cells. We discuss defects in molecular...
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