Solution processed small molecule organic interfacial layers for low dark current polymer photodiodes |
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| Authors: | Sebastian Valouch Christian Hönes Siegfried W Kettlitz Nico Christ Hung Do Michael FG Klein Heinz Kalt Alexander Colsmann Uli Lemmer |
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| Affiliation: | 1. Light Technology Institute and DFG Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), Engesserstr. 13, 76131 Karlsruhe, Germany;2. Institute of Applied Physics and DFG Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str. 1, 76131 Karlsruhe, Germany |
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| Abstract: | We demonstrate a small molecule solution processed hole interfacial layer approach to improve the dark current characteristics of polymer photodiodes. The two hole blocking materials under investigation 3-phenyl-4(1′-naphthyl)-5-phenyl-1,2,4-triazole (TAZ) and 2-3,5-bis(1-phenylbenzimidazol-2-yl)phenyl]-1-phenylbenzimidazole (TPBi) are spincoated from ethanol as an orthogonal solvent on top of a P3HT:PCBM active layer. We reduce the dark current at a bias voltage of −1 V by a factor of 17.2 by introducing a TAZ interfacial layer while keeping the responsivity unchanged. |
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| Keywords: | Organic photodetector Organic photodiode Interfacial layer Solution process |
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