Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
The iodide/triiodide redox was for many years the dominant system for hole transport in dye-sensitized solar cells. The large overpotential (ca. 0.5 V) required for iodide to reduce an oxidized dye molecule led to an intense search for alternatives, with cobalt(II/III) complexes now favored. However, apart from the overpotential problem, iodide/triiodide is an excellent system. Both the oxidized and reduced forms are very cheap, highly soluble, small (for good mass transport), and have minimal light absorbance. The system has uniquely low rates of recombination with electrons in the photoanode (e.g. TiO2), which is often credited to the fact that even the oxidized species carries a negative charge. Alternatives tend to be bulky and to exhibit rapid recombination, requiring very thin photoanode films.
We previously presented a scheme to overcome the overpotential problem by anchoring a platinum nanoparticle to a dye molecule. We have synthesized Pt nanoparticles 1-2 nm in diameter [1] and a bifunctional dye molecule [2] capable of binding to both TiO2 and to Pt. Here we will present results from new dyes developed to effectively bind Pt nanoparticles while giving more facile synthesis, higher solubility, and better stability. Non-aqueous cyclic voltammetry using Pt wire working electrodes previously immersed in the novel dyes show strong reversible redox peaks for dyes featuring sulfur-containing dithiolane or thiol groups, while no signals are seen for wires immersed in dyes having only carboxyl groups, indicating that the novel dyes bind to the Pt exclusively via the S atoms. Characterization of the TiO2-dye-Pt assemblies by SEM/EDX and FTIR Raman spectroscopies will be presented, along with device concepts and early results.
[1] Liu, G.; Arellano-Jiménez, M.J.; Carter, C.B.; Agrios, A.G. "Preparation of functionalized platinum nanoparticles: a comparison of different methods and reagents," J. Nanopart. Res. 2013, 15, 1744-1756.
[2] Kopecky, A.; Liu, G.; Agushi, A.; Agrios, A.G.; Galoppini, E. "Synthesis of bifunctional Ru complexes with 1,2-dithiolane and carboxylate-substituted ligands," Tetrahedron 2014, 70, 6271-6275.
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.