Tuesday , September 27 2022

New research shows a great promise for improving solar cell efficiency



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Comparison of overall inorganic peroxisome efficiency

All inorganic Perovskites compare well with their hybrid counterparts in efficiency. Honor: Illustrated by Xi Zhang

New research shows a great promise of all inorganic peroxidase solar cells to improve the efficiency of solar cells.

Hybrid organic-inorganic peroxisomes have already demonstrated high voltage efficiencies of more than 25%. The wisdom in this field is that the organic (carbon and hydrogen-containing) molecules in the material are very important in achieving this attractive function because they are believed to prevent the reassembly of defective support carriers.

New research from the UC Santa Barbara Materials Department has shown that not only is this assumption wrong, but that all non-inorganic materials have the potential to work better than hybrid pervascites. These findings are published in the October 20, 20, issue of Awake! In an article entitled “All Inorganic Halide Peroxides as Candidates for Efficient Solar Cells.” Cells report on physiology.

Xi Zhang, lead researcher in the study, explained: “To compare the material, we performed a detailed simulation of the reassembly mechanisms. When light shines on a solar cell material, a current is generated by the photo-generated carriers; Reassembly with deficiencies destroys some of those carriers and therefore reduces efficiency. Therefore, inefficiency acts as a killer. ”

The researchers studied two prototype materials to compare inorganic and hybrid pervascites. Both of these substances contain lead and iodine atoms, but one of the elements contains the inorganic element cesium, which completes the crystal structure, and the other contains the organic methylmonium molecule.

These processes are difficult to classify experimentally, but state-of-the-art quantum-mechanical calculations can accurately predict the rate of reunion, thanks to the new methodology of the UCSB material by Professor Chris Van de Vole’s team. Turiansky, a senior graduate student on the team, helped write the code to calculate reunion rates.

“Our methods are very powerful in determining what are the shortcomings that lead to the loss of carriers,” Turiansky said. It is gratifying to see the application of renewable energy efficient generation, that is, the approach to one of the most crucial issues of our time.

The implementation of the simulations showed that the common defects of both materials create a comparable (and relatively friendly) recombination level. However, the hybrid can break down the organic molecule in the perovskites; When hydrogen atoms are lost, their “vacuum” capacity is greatly reduced. The presence of a molecule adversely affects the overall efficiency of a substance rather than an asset.

So why has this not been explored experimentally? Mainly because it is more difficult to grow high quality layers of all inorganic materials. They have a tendency to follow other crystal structures and require more experimental effort to promote the formation of the desired structure. Recent research, however, has shown that achieving the desired structure is definitely possible. However, the difficulty explains why not all organic invertebrates have received much attention so far.

“We hope the findings on expected efficiency will stimulate more activity for the production of inorganic peroxisomes,” Van de Vale said.

Reference: “All Inorganic Halide Perovskite As Candidates for Efficient Solar Cells” Xi Zhang, Mark E. Cells report on physiology.
DOI: 10.1016 / j.xcrp.2021.100604

This research was funded by the Department of Scientific Energy, Office of Basic Energy Science; The calculations were performed at the National Energy Research Scientific Computer Center.



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