A biomimetic photovoltaic device with microfluidic replenishment network. Image: Hyung-Jun Koo &

A biomimetic photovoltaic device with microfluidic replenishment network. Image: Hyung-Jun Koo & Orlin D. VelevSelf-Healing Solar Cells ‘Channel’ Natural ProcessesSolar front! Rather than improvements in efficiency, recent developments have focused on countering UV-caused degradation. Work from North Carolina State University researchers Orlin Velev and Hyung-Jun Koo use is inspired by the ‘“branching” vascular channels’ used to transport nutrients in leaves and hands, similar to elements of biomimicry:In a new paper, North Carolina State University researchers Orlin Velev and Hyung-Jun Koo show that creating solar cell devices with channels that mimic organic vascular systems can effectively reinvigorate solar cells whose performance deteriorates due to degradation by the sun’s ultraviolet rays. Solar cells that are based on organic systems hold the potential to be less expensive and more environmentally friendly than silicon-based solar cells, the current industry standard.The nature-mimicking devices are a type of dye-sensitized solar cells (DSSCs), composed of a water-based gel core, electrodes, and inexpensive, light-sensitive, organic dye molecules that capture light and generate electric current. However, the dye molecules that get “excited” by the sun’s rays to produce electricity eventually degrade and lose efficiency, Velev says, and thus need to be replenished to reboot the device’s effectiveness in harnessing the power of the sun.“Organic material in DSSCs tends to degrade, so we looked to nature to solve the problem,” Velev said. “We considered how the branched network in a leaf maintains water and nutrient levels throughout the leaf. Our microchannel solar cell design works in a similar way. Photovoltaic cells rendered ineffective by high intensities of ultraviolet rays were regenerated by pumping fresh dye into the channels while cycling the exhausted dye out of the cell. This process restores the device’s effectiveness in producing electricity over multiple cycles.”Velev, Invista Professor of Chemical and Biomolecular Engineering at NC State and the lead author of a paper in Scientific Reports describing the research, adds that the new gel-microfluidic cell design was tested against other designs, and that branched channel networks similar to the ones found in nature worked most effectively.Study co-author Dr. Hyung-Jun Koo is a former NC State Ph.D. student who is now a postdoctoral researcher at the University of Illinois. The study was funded by the National Science Foundation and the U.S. Department of Energy.Source | The PaperFurther reading:Mimicking Nature, Water-Based ‘Artificial Leaf’ Produces ElectricityPhotovoltaic Degradation Rates — An Analytical ReviewUCLA researchers double efficiency of novel solar cellThe best of two worlds: Solar hydrogen production breakthroughDye-sensitized solar cells rival conventional cell efficiencyAntifreeze, cheap materials may lead to low-cost solar energy -- source link

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