Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
Publication date: 20th April 2022
Copper (Cu) is a potential alternative to silver (Ag) as the reflective electrode in inverted organic solar cells because it is approximately 1% of the cost, with comparable electrical conductivity and higher work function. However, due to its higher susceptibility to oxidation in air than Ag it is not widely used for this purpose. Our group, and others, have shown that the rate of oxidation of Cu films actually depends very strongly on the structure and morphology of the film and can be extremely slow after oxidation of the first few nanometres, even for polycrystalline Cu films. This implies that for the metal thickness used as an opaque electrode (≥100 nm) oxidation of the top exposed surface of the Cu electrode is unlikely to be the fastest degradation mechanism in an organic solar cell. Indeed, a Cu top electrode could actually serve the dual role of low cost electrode and built-in desiccant for low levels of oxygen and water ingress in encapsulated PV devices. Furthermore, if the buried interface is oxidised to CuO and/or Cu2O, due to oxygen and water ingress into the photoactive layer, the barrier to hole-extraction could be minimal, since both are p-type semiconductors with almost identical valence band edge energies that are well-aligned with the ionisation potential of donor type organic semiconductors used in organic solar cells. This poster presents the result of an investigation into the potential of copper(II) acetylacetonate (Cu(AcAc)2) as a buffer layer between the photoactive organic layer and the Cu top electrode. Cu(AcAc)2 can be solution processed from alcoholic solutions directly onto films of organic semiconductor and decomposes at low temperature to form metallic Cu, so has the potential to seed the formation of a compact Cu electrode on top of the photoactive organic semiconductor layer.
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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.