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Solution processed small molecule organic interfacial layers for low dark current polymer photodiodes

Authors
Journal
Organic Electronics
1566-1199
Publisher
Elsevier
Volume
13
Issue
11
Identifiers
DOI: 10.1016/j.orgel.2012.07.044
Keywords
  • Organic Photodetector
  • Organic Photodiode
  • Interfacial Layer
  • Solution Process

Abstract

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 −1V by a factor of 17.2 by introducing a TAZ interfacial layer while keeping the responsivity unchanged.

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