An article by Hyunbok Lee, Egle Puodziukynaite, Yue Zhang, John C. Stephenson, Lee J. Richter, Daniel A Fischer, Dean M. DeLongchamp, Todd Emrick*, and Alejandro L. Briseno* is featured in the current issue of JACS.
Dr. Hyunbok Lee et al. demonstrate the use of poly(sulfobetaine methacrylate)s (PSBMA) as solution-processible work function reducers for inverted organic electronic devices. 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. As a result, the performance of organic photovoltaic devices with PSBMA interlayers is significantly improved. This work makes available a new class of dipole-rich, counterion-free, pH insensitive polymer interlayers with demonstrated effectiveness in inverted devices.