Bulk heterojunction polymer solar cells made from a novel low-bandgap polymer show the highest photocurrent response so far for this class of materials (see figure). Efficiencies up to 3.2 % are realized, but this conjugated polymer has the intrinsic capability to reach 7 % efficiency because of its material properties. Possible loss mechanisms and improvements are discussed.
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Mühlbacher et al. (2006) studied this question.
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