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![]() by Staff Writers Tarragona, Spain (SPX) Jan 29, 2021
Imagine looking for the optimal configuration to build an organic solar cell made from different polymers. How would you start? Does the active layer need to be very thick, or very thin? Does it need a large or a small amount of each polymer? Knowing how to predict the specific composition and cell design that would result in optimum performance is one of the greatest unresolved problems in materials science. This is, in part, due to the fact that the device performance depends on multiple factors. Now, researchers from the Universitat Rovira i Virgili (URV) specialized in Artificial Intelligence have collaborated with researchers from Institute of Materials Science of Barcelona, specialized on materials for energy applications, to combine the experimental data points that they gather with artificial intelligence algorithms and enable an unprecedented predicting capability of the performance of organic solar cells. ICMAB researchers, led by Mariano Campoy-Quiles, have generated multiple data sets by using a new experimental method that allows them to have a large number of samples in only one, speeding the time compared to conventional methods. Then, machine-learning models are used to learn from those data sets and predict the performance of even more materials, such as novel organic semiconductors synthesized at the group of Prof. Martin Heeney at Imperial College London. This study may be the first of many in the field combining artificial intelligence and high-throughput experiments to predict the optimum conditions of certain materials and devices.
Obtaining multiple experimental data points "When using a conventional method, a sample provides you with information about only one point. However, using our methodology we can obtain between 10 and 1000 times more points. This allows, on the one hand, to evaluate the photovoltaic potential of a material about 50 times faster than with conventional methods. On the other hand, it provides large statistics and a huge set of data (hundreds of thousands of points) that allow us to reliably train different artificial intelligence algorithms" says Mariano Campoy-Quiles, ICMAB researcher and co-author of this study.
Artificial Intelligence algorithms to predict the behavior Artificial intelligence algorithms in the field of materials science are mainly used to look for behavior patterns and to further develop predictive models of the behavior of a family of materials for a given application. To do so, an algorithm is first trained by exposing it to real data to generate a model algorithm. The model is then validated with other data points not used to create the model, but from the same category of materials. Once validated, the algorithm is applied to predict the behavior of other similar materials that are not part of the training nor validating set. In this specific study, AI algorithms are trained with thousands of points obtained with the high throughput method to evaluate and predict the different factors that determine the efficiency of an organic solar cell. "The use of AI algorithms was particularly challenging in this case", explains Roger Guimera, ICREA Professor and researcher from URV's Department of Chemical Engineering and co-author of the study, "because the volume and complexity of the data, and because the ultimate goal is to extrapolate to new materials that have never been tested."
Achievements and future challenges "The second important point is that thanks to AI, we have determined which are the physical parameters that affect to a greater extent this behavior" says Mariano Campoy-Quiles, and adds "In particular, we have seen that the most critical parameters that determine the optimum composition are the electronic gap of each material, as well as how balanced the charge transport is in each one." Researchers believe that the results and the methodology developed in this study are very important to guide theoretical researchers as to what to take into account when developing future analytical models that attempt to determine the efficiency of a given system. "Our next challenge is to understand much more complex systems. The more complex the system, the more useful AI can be" concludes Campoy-Quiles.
![]() ![]() Scientists develop perovskite solar modules with greater size, power and stability Onna, Japan (SPX) Jan 28, 2021 Researchers from the Okinawa Institute of Science and Technology Graduate University (OIST) have created perovskite solar modules with improved stability and efficiency by using a new fabrication technique that reduced defects. Their findings were published on the 25th January in Advanced Energy Materials. Perovskites are one of the most promising materials for the next-generation of solar technology, soaring from efficiencies of 3.8% to 25.5% in slightly over a decade. Perovskite solar cells are ... read more
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