High-detectivity near-infrared (NIR) polymer photodetectors (PDs) fabricated by a novel low-bandgap semiconducting polymer blended with fullerene derivatives are reported. Operating at room temperature, the polymer PDs have a spectral response from 400 to 1100 nm. By incorporation of an alcohol/water-soluble polymer as a cathode interlayer in bulk heterojunction polymer PDs, the polymer PDs exhibit a high detectivity of 1.75 × 10 13 cm•Hz 1/2 /W at 800 nm. These results demonstrated that the NIR polymer PDs are comparable to Si-based PDs.
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Hu et al. (2013) studied this question.