Researchers have united two solar technologies to improve both efficiency and stability
have hovered around 27% and 26%, respectively, tandem devices have demonstrated efficiencies over 33% in less than a decade of research. “We thought that in addition to their higher efficiencies, tandem solar cells could also solve some of the stability challenges facing perovskites by linking them with silicon cells, which are much more stable.”
Such partial shading usually spells doom for perovskites, as the still-illuminated cells force charge to flow through the now-shaded and inactive cell, quickly degrading both it and the entire module. Silicon solar cells, on the other hand, are much more resilient to voltage fluxes and can endure periods of partial shading with fewer issues.
“When you combine two different materials to form a final product, usually it’s the weakest link that ends up determining the overall strength of the chain,” said co-author, professor of material science and engineering at KAUST. “But in this case, it’s actually the stronger component that protected the weaker one.”
The team also said that the findings bode well for the commercialization prospects of perovskites, because they imply that perovskites may have the most potential when deployed in complement with silicon solar cells, for which a mature manufacturing ecosystem already exists. Instead of having to build a competing manufacturing process, perovskites could be added onto the commercially proven production process for silicon solar cells.
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