Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP24)
DOI: https://doi.org/10.29363/nanoge.iperop.2024.020
Publication date: 18th October 2023
Among the different renewable energy sources, solar energy stands out because of its abundance and global character. The sun delivers more energy to the Earth within one hour than we use in a whole year from fossil, nuclear, and renewable energy combined. Silicon solar cells currently cover 90% of the market, but require a lot of scarce space on rooftops or in solar parcs. Therefore, integration of photovoltaic technologies in building facades is a very interesting and complementary approach. One of these building facades that occupy a great amount of space in modern constructions are windows. Integration of photovoltaics in windows requires visible transparency. To achieve this, the photoactive materials must absorb as little as possible in the visible range (defined as 435‒670 nm). This implies that only the ultraviolet (UV) and near-infrared (NIR) part of the solar spectrum can be employed for energy generation. Since only 2% of the solar energy is located in the UV region, and as much as 51% is NIR light, the focus lies on NIR photon harvesting. As inorganic solar cells have a fixed absorption in the visible area, these are not fitted for this application. In contrast, organic photovoltaics (OPVs) have a tuneable absorption range (Figure 1) and are therefore much more suitable.1 Recently, several well-performing NIR-absorbing non-fullerene acceptors have become available, such as IEICO-4F, FOIC, and Y6.2 NIR-absorbing donor polymers on the other hand are rather scarcely reported. Using the push-pull approach, the absorption can be shifted to the NIR by combining strong electron-donating and strong electron-accepting monomers to obtain an ‘ultra-low’ bandgap conjugated polymer.
In this work, we focus on the synthesis of novel NIR-absorbing donor polymers based on diketopyrrolopyrrole (DPP) as the electron-accepting monomer. Several electron-donating monomers are combined with DPP using Stille cross-coupling polymerization. The polymer with the highest open-circuit voltage was used in an organic solar cell optimization study, incorporated in a transparent device stack (Figure 1), and evaluated on its performance and transparency. Lastly, a new fluorinated DPP polymer was synthesized to red-shift the absorption and enhance the open-circuit voltage.
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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.
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