From Event: SPIE Organic Photonics + Electronics, 2015
We demonstrate the use of polymeric zwitterions, namely, poly(sulfobetaine methacrylate) (PSBMA), as solution-processable work function reducers for inverted organic electronic devices. A notable feature of PSBMA is orthogonal solubility relative to solvents typically employed in the processing of organic semiconductors. A strong permanent dipole moment on the sulfobetaine moiety was calculated by density functional theory. PSBMA interlayers reduced the work function of a broad range of electrodes [indium tin oxide (ITO), Au, Ag, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), Cu, Al, and even graphene] by over 1 eV. By employing an ultrathin interlayer of PSBMA, one can reduce the electron injection barrier between ITO and C70 by 0.67 eV. As a result, the device performance of OPVs with PSBMA interlayers are significantly improved, and enhanced electron injection is demonstrated in electron-only devices with ITO, PEDOT:PSS and graphene electrodes. This work makes available a new class of dipole-rich, counterion-free, pH insensitive interlayers for use as strong work function reducers for any electrode.
Hyunbok Lee, Egle Puodziukynaite, Todd Emrick, Alejandro L. Briseño, and Paul A. Lane, "Poly(sulfobetaine methacrylate)s as electrode modifiers for inverted solar cells (Presentation Recording)," Proc. SPIE 9567, Organic Photovoltaics XVI, 956704 (Presented at SPIE Organic Photonics + Electronics: August 11, 2015; Published: 5 October 2015); https://doi.org/10.1117/12.2191606.4519371841001.
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