Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.037
Publication date: 11th July 2022
OPV cells have a proven efficiency of over 18 % while OPV modules have a proven record efficiency of 13.5 %. Both values are still increasing towards > 20 % for small area cells and > 15 % for large scale modules. With these performance values, OPV is reaching out to applications that are going beyond the typical niche markets. The first generation of commercially available OPV modules shows lifetimes in the order of 5 years and more under outdoor conditions. Independent of the application, the lifetime limitations of organic solar cells are not fully understood. Few publications reported operational lifetimes of over 25000 hrs. Organic solar cell materials being stable against photooxidation were as well reported, and, most recently, we demonstrated solar cells that canbe operated in water and under 1 sun for hundreds of hours – unpackaged. However, all these “best you can do” lifetime values are reported for different combinations of materials and interface systems.
This talk will discuss a degradation mechanism that has been overlooked so far but probably is decisive to understand for longlived operation. The community is well aware of the impact of the light source on the degradation mechanism. Blocking the UV part of the solar spectrum till 380 nm became an unwritten law for outdoor as well as indoor testing. However, one has to critically ask whether a 380 nm cutoff is indeed sufficient to stabilize a solar cell. We have investigated degradation as a function of the spectral distribution, and found degradation mechanisms that have not been reported yet. Most specifically, the combination of the interface material, the semiconductor and the spectrum of the light source dominate degradation kinetics. The spectral excitation spectrum for degradation does not coincide with the EQE of the solar cell, indicating interface induced mechanisms. All these findings indicate that OPV has to overcome another hurdle before further improving the operational stability.
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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.
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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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