Furthermore, a reduction of the non-radiative recombination losses and an improved exciton diffusion, are the results of the superior molecular ordering. The resulting structure improves the charge carrier collection, leading to a superior short-circuit current and fill factor. The addition of DPE has effects on the molecular organization in the active layer, with an enhancement in the donor polymer ordering, showing a higher domain purity. Remarkably, the stability under illumination of the solar cells is also improved when DPE is used. Thanks to the addition of DPE, a best efficiency of 11.7% have been obtained for the system TPD-3F:IT-4F, an increase over 15% with respect to the efficiency of devices fabricated without additive. In this work, we propose the use of diphenyl ether (DPE) as additive, in combination with the non-halogenated solvent o-xylene, to fabricate organic solar cells with a completely halogen-free process. Therefore, the identification of non-halogenated additives and the study of their effects on the device performance and stability are of primary importance. Additives in solution have been used to fine-tune the nanostructure and improve the performance of organic solar cells. The reason behind this is the non-optimal nanostructure of the active layer obtained with green solvents. However, devices fabricated by processing the active layer with green solvents still struggle to reach, in terms of efficiency, the same performance as those fabricated with halogenated solvents. His views and conclusions are not necessarily those of ARCHITECT magazine nor of the American Institute of Architects.The development of an environmentally friendly fabrication process for non-fullerene acceptor organic solar cells is an essential condition for their commercialization. Perhaps a mobile version will one day be available, providing graffiti artists with the ability to paint and generate renewable power simultaneously.īlaine Brownell, AIA, is a regularly featured columnist whose stories appear on this website each week. The development suggests new opportunities to cover a variety of building materials with solar-harvesting coatings, although further research is needed to determine its durability and longevity. "I believe that new, thin-film photovoltaic technologies are going to have an important role to play in driving the uptake of solar energy, and that perovskite-based cells are emerging as likely thin-film candidates,” Lidzey said. However, the new spray-painted material requires much less energy to make than silicon, and the technology is developing quickly, with promising applications in a variety of solar technologies. The perovskite-based cells can achieve a 19-percent efficiency rating compared to the pervasive silicon-based cells' 25-percent rating. "Remarkably, this class of material offers the potential to combine the high performance of mature solar-cell technologies with the low embedded-energy costs of production of organic photovoltaics.”Īlex Barrows and Jon Griffin A close-up of the spray head (left), and a diagram defining the spray pattern. "There is a lot of excitement around perovskite-based photovoltaics,” said Sheffield physics professor and the project's lead researcher, David Lidzey, in a press release. Perovskite is a mineral made of calcium titanium oxide and is widely distributed throughout the Americas, Europe, and Asia. Unlike the earlier organic semiconductor coatings, the perovskite version is more efficient and less carbon-intensive to produce. Many renewable-energy laboratories are developing paints and coatings that can convert solar rays into energy, but the Sheffield researchers are the first to develop a method to fabricate a perovskite-based solar coating using a spray-applied process. ![]() Talk of spray-painting may conjure images of graffiti or street utility work, but scientists at the University of Sheffield in the United Kingdom recently revealed that the technique can be used to harness the sun’s power. developed a technique for fabricating solar cells using a perovskite-based coating. Lucy Pickford Researchers at the University of Sheffield in the U.K.
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