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Sunlight is defined as the total spectrum of the electromagnetic radiation emitted by the sun. On earth, sunlight is filtered through the atmosphere and the solar radiation is visible as daylight when the sun is above the horizon. When the direct radiation isn’t blocked by clouds, it is experienced as a combination of bright light and heat. Solar Irradiance data is a critical component of climate and environmental study, but solar radiation can affect many other areas of life on earth. Think about agriculture, health, technology or manufacturing.
perovskite itself is layered with a transparent conductive layer used to carry an electric current from the cell out to where it can be used. However, if the conductive layer is directly attached to the perovskite itself, the electrons and their counterparts, called holes, simply recombine on the spot and no current flows. In the researchers’ design, the perovskite and the conductive layer are separated by an improved type of intermediate
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layer that can let the electrons through while preventing the recombination. This middle electron transport layer, and especially the interfaces where it connects to the layers on each side of it, tend to be where inefficiencies occur. By studying these
mechanisms and designing a layer consisting of tin oxide, which more perfectly conforms with those adjacent to it, the researchers were able to greatly reduce the losses.
The development of the new layer was combined with an optimisation of the perovskite layer itself. The researchers used a set of additives to the perovskite recipe to improve its stability, which had been tried before but had an undesired effect on the material’s bandgap, making it a less efficient light absorber. The team found that by adding much smaller amounts of these additives — less than 1 per cent — they could still get
Avantes has worked closely with industrial and research customers in the solar industry to design spectroscopy and spectroradiometry systems which meet the demands of this fast growing industry. Each application needs different equipment to do the right measurements, but one commonly used spectrometer in the solar industry is our AvaSpec- ULS2048CL-EVO. Avantes helps you find the perfect solution for your measurement. Find out more about spectroscopy in the solar industry on our website.
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the beneficial effects without altering the bandgap. The resulting improvement in efficiency has already driven the perovskite material to over 80 per cent of the theoretical maximum efficiency that such materials could have. While these high efficiencies
were demonstrated in tiny lab-scale devices, ‘the kind of insights we provide in this paper, and some of the tricks we provide, could potentially be applied to the methods that
April 2021 Electro Optics 25
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