Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.205
Publication date: 6th July 2018
Solution processed graphene oxide (GO), has gained increased interest as optoelectronic device platform due to its ability to act as amphiphilic macromolecule, favoring the formation of complexes with conjugated polymers, that can be used in improved optoelectronic devices. Recently, charge transfer has been demonstrated in complexes of poly(3-hexylthiophene nanoparticles (P3HT NPs) and GO sheets (P3HTNPs – GO hybrids) prepared by self-assembly in-situ reprecipitation [1]. In this work, Kelvin Probe Force Microscopy (KPFM) is used to investigate the P3HTNPs–GO nanohybrids formation. By mapping the local surface potential (SP) in darkness, the polymer chain aggregrate structure is resolved. In addition, surface photovoltage (SPV) measurements on individual nanoparticles under super-band-gap illumination shed light on the photoinduced charge generation and charge recombination mechanisms at the different interfaces. This is an important step to understand the rather overall functionality thin film layers composed of individual nanoscale objects and for further optimizing the optoelectrical performance of thin film devices.
[1] E. Istif, J. Hernández-Ferrer, E. P. Urriolabeitia, A. Stergiou, N. Tagmatarchis, G. Fratta, M. J. Large, A. B. Dalton, A. M. Benito, and W. K. Maser, “Conjugated Polymer Nanoparticle–Graphene Oxide Charge-Transfer Complexes”, Adv. Funct. Mater., 1707548, 2018.
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