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Extended spectral response in organic photomultiple photodetectors using multiple near-infrared dopants
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We demonstrate highly sensitive polymerphotodetectors (OPDs) with spectral response extending from the ultraviolet to the near-infrared(NIR) region (∼1200 nm). After doping two NIRdopants, high external quantum efficiencies (∼5500%) and high responsivities (23.0 A/W) are achieved under a low reverse bias (−3.7 V). The high gains could be attributed to unbalanced carrier transport in the photoactive layer arising from the electron traps at the NIRdopants. This approach allows the ready preparation of OPDs exhibiting broad spectral responses and high quantum efficiencies simultaneously.
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