Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.147
Publication date: 30th March 2023
Minimising the regeneration driving force for electron transfer between oxidised dyes attached to semiconductor surfaces and redox mediators in electrolytes (regeneration) is a promising pathway to increased open circuit voltage of regenerative-type photoelectrochemical solar energy conversion devices. Cu1+/2+ complexes dissolved in electrolytes have been claimed to show fast regeneration at only -100 meV driving force. Here we show using transient absorption spectroscopy that regeneration using a heteroleptic Cu1+ complex with a high oxidation potential (dye regeneration driving force -170 meV) is slow. On the other hand, the typically slow (millisecond) recombination between electrons injected into TiO2 and the oxidised dyes is accelerated by three orders of magnitude in the presence of a high redox potential Cu2+ complex. When using the typical Cu1+/2+ complex electrolyte mixture, the acceleration of TiO2 – dye+ recombination can easily be misinterpreted as fast dye regeneration. The accelerated recombination uncovered by selectively measuring TA decays in the presence of Cu1+ and Cu2+ dominant species electrolyes is suggested to be the origin of the significant photocurrent decrease of solar cells using high redox potential Cu1+/2+ complexes with high "apparent" regeneration yield. The presentation will focus on the possible origin of the acceleration of recombination kinetics, updated transient absorption experimental procedures to measure electron recombination and strategies to deccelarate the recombination reaction. Finally, applications where such unprecedented acceleration of interfacial electron transfer kinetics could be beneficial will be presented.
This work is financially supported by ARC Discovery (DP190100687) project, Australia. Funding from the Australian Research Council Centre of Excellence Scheme (Project CE 140100012) and Linkage (LE180100060) is gratefully acknowledged. The authors thank the Australian National Nanofabrication Facility-Materials node for equipment use.
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.