Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
With device efficiency achieving the threshold for commercial viability, the stability challenge is now widely recognized as a critical, unsolved problem for the commercialization of solution processed organic solar cells. Recently device degradation due to exposures to light and oxygen has become a key consideration for outdoor application of organic solar cells, with significant research efforts dedicated to this topic in order to understand its detailed degradation mechanisms. However, to date most of these studies have been focusing on understanding and improving the stability of the donor polymers, while the photochemical stability of fullerenes and their impacts on the overall stability of organic solar cells remain widely unclear. Here we show that a very low amount of photo-oxydised PCBM can result in severe degradation of benchmark organic solar cells, and accounts for the initial rapid degradation of unencapsulated devices under light and oxygen exposure. This is due to the formation of energetic trap states for electron transport, resulting in severe trap assisted recombination losses. Our results show that photo-oxydation of fullerenes, in addition to the photochemical stability of donor polymers, is a key degradation pathway of organic solar cells under light and oxygen exposure, and highlight the importance for the development of more stable alternative accepter materials.
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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.
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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.
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