Poly(sulfobetaine methacrylate)s as Electrode Modifiers for Inverted Organic Electronics

Published

January 14, 2015

Author(s)

Hyunbok Lee, Egle Puodziukynaite, Dean DeLongchamp, Todd Emrick, Alejandro Briseno

Abstract

We demonstrate the use of poly(sulfobetaine methacrylate) (PSBMA), and its pyrene-containing copolymer, as solution-processable work function reducers for inverted organic electronic devices. A notable feature of PSBMA is its 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 metals, graphene, and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) by over 1 eV, and an ultrathin interlayer of PSBMA reduced the electron injection barrier between ITO and C70 by 0.67 eV. As a result, the device performance of OPVs with PSBMA interlayers is 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 polymer interlayers with demonstrated effectiveness in inverted devices.

Citation

Journal of the American Chemical Society

Pub Type

Journals

Citation

Lee, H. , Puodziukynaite, E. , DeLongchamp, D. , Emrick, T. and Briseno, A. (2015), Poly(sulfobetaine methacrylate)s as Electrode Modifiers for Inverted Organic Electronics, Journal of the American Chemical Society (Accessed May 18, 2024)