Abstract
A low bandgap conjugated polymer comprising benzodithiophene and diketopyrrolopyrrole units was designed and synthesized. The polymer showed an optical bandgap of ~1.3 eV and exhibited broad absorption in visible and near-infrared spectral ranges. Photodetectors based on the polymer/fullerene derivative blends were fabricated and their electrical behavior was investigated. The devices demonstrated rapid response in the infrared (λ = 850 nm) wavelengths. Photodetectors can be operated in up to 2.6 × 105 Hz frequency regime with responsivity of 42 mA W-1 and detectivity of 1.26 × 1012 Jones at λ = 850 nm and zero external bias.
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