Porphyrin‐Tape/C60 Organic Photodetectors with 6.5% External Quantum Efficiency in the Near Infrared

Several porphyrin-dimer tapelike molecule/C60 heterojunction detectors are investigated. Their extended π-electron systems provide photovoltaic response into the near infrared, with an external quantum efficiency of up to 6.5% at a wavelength of λ = 1350 nm. Additionally, a specific detectivity of D* = 1.6 × 1011 Jones at λ = 1090 nm, and (2.3 ± 0.1) × 1010 Jones at λ = 1350 nm are detected. The optical response time of the detectors is resistance–capacitance limited at 1.87 ± 0.03 ns.