Vyacheslav Diev - Use of additives in porphyrin-tape/C60 near-infrared photodetectors

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      Publication Details (including relevant citation   information):

      Organic   Electronics   2011, 12, 869-873.

      Abstract:

      We demonstrate organic heterojunction photodetectors sensitive to   wavelengths λ > 1500 nm based on a solution processed   Zn–porphyrin-dimer donor   layer that includes phenyl-C61-butyric acid methyl   ester (PCBM) and/or 4,4′-bipyridyl (Bipy) additives, and an evaporated   C60 acceptor layer. The inclusion of PCBM results in   up to a 20-fold increase in differential resistance, while the   inclusion of Bipy results in   up to a 100% increase in external quantum efficiency   (EQE) compared to devices lacking additives. The devices   have peak specific detectivities of D = 8.8   ± 0.2 × 1011 Jones (EQE = 3.6 ± 0.1%) at   λ = 1130 nm, and D = 8.2 ± 0.2 ×   1010 Jones (EQE = 10.5 ± 0.2%) at λ  = 1400 nm. The maximum external quantum efficiency at λ  = 1400 nm is 13.5 ± 0.3%, approximately double that of previously   reported organic near infrared detectors.

      Address (URL): http://www.sciencedirect.com/science/article/pii/S1566119911000632