Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.033
Publication date: 6th July 2018
The properties of NiO, such as charge transport or optoelectronic characteristics, can be modified by functionalization with organic molecules. These kinds of organic/inorganic surfaces are of great interest, in particular, for the design of hybrid devices like dye sensitized solar cells [1]. However, a key parameter in the design of optimized interfaces is not only the choice of the compounds but also the properties of adsorption. Thus, fundamental studies of such hybrid systems at the nanoscale are desirable. So far, characterization of adsorbates at ambient temperature through spectroscopy techniques, such as x-ray photoelectron spectroscopy, has been limited to large agglomerates or self- assembled molecules. Recently, first studies of the adsorption properties of single molecules on NiO measured by force microscopy at low temperatures have been published [2]. This limit can be stretched to the level of individual adsorbates measured by means of non-contact atomic force microscopy at room temperature.
We investigated the deposition of a 2,2´-bipyridine based molecule, functionalized with carboxylic acid anchoring domains on a NiO(001) single crystal surface [3]. Depending on the coverage, single molecules, groups of adsorbates with random or recognizable shapes, or islands of closely packed molecules could be identified. Single molecules and self assemblies, as visible in the image on the right side, are resolved with submolecular resolution showing that they are lying flat on the surface with the 2,2´-bipyridine in a trans-conformation. Only in the close-packed form was a measurable charge transfer from the NiO to the molecular layer of 0.3 electrons per molecule observed independent on the molecular orientation of the islands.
[1] C. Wood et al., Phys. Chem. Chem. Phys. 18 (2016) 10727.
[2] A. Schwarz et al., J. Phys. Chem. C 117 (2013) 1105.
[3] S. Freund et al., submitted to ACS Nano (2017).
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.