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We demonstrate organic heterojunction photodetectors sensitive to wavelengths λ>1500nm based on a solution processed Zn–porphyrin-dimer donor layer that includes phenyl-C 61 -butyric acid methyl ester (PCBM) and/or 4,4′-bipyridyl (Bipy) additives, and an evaporated C 60 acceptor layer. The inclusion of PCBM results in up to a 20-fold increase in differential resistance, while the...
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