کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1265366 | 972216 | 2011 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Use of additives in porphyrin-tape/C60 near-infrared photodetectors Use of additives in porphyrin-tape/C60 near-infrared photodetectors](/preview/png/1265366.png)
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.
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► Porphyrin tape compounds with additives used for efficient infrared photodetectors.
► Efficiencies of 13.5% and detectivities of ∼1012 Jones are obtained.
► Dark currents and ideality factors are modified by the additive concentration.
Journal: Organic Electronics - Volume 12, Issue 5, May 2011, Pages 869–873