Key Findings
A research team led by faculty at Princeton, the University of California-San Diego, and Sungkyunkwan University has developed a method to mitigate microscopic defects in perovskite crystals. By introducing a specific chemical mixture during fabrication, the team produced perovskites that allow electrons to retain excess energy for up to 300 microseconds—approximately 100,000 times longer than many other semiconductors. This improvement could translate to a 1% increase in power generation for the most advanced perovskite solar cells.
Technical Details
The fabrication process involves adding a mixture of zinc bromide and methyl ammonium chloride early in the production stage. The effectiveness of this approach relies on the two chemicals having a lower melting point when combined. This chemical intervention reduces atomic-level defects in the crystalline structure that typically dampen the ability of electrons to retain energy after absorbing sunlight. Because perovskite ingredients can be prepared in liquid form, these materials can be fabricated by printing them in sheets.
Background and Context
Perovskites are semiconductors with complex crystalline structures suited for converting solar energy into electricity. While silicon remains the industry standard due to its durability, perovskites offer a cheaper and more sustainable production alternative. Current trends involve “tandem solar cells,” where a thin layer of perovskite is placed over a silicon cell; these configurations generate about 40% more power than single-material cells. However, the printing and layering process often introduces the defects that this new research addresses.
Significance and Outlook
The ability to create low-defect perovskite layers provides a scalable way to augment standard silicon cells, addressing rising energy demands for AI and datacenter infrastructure. Beyond photovoltaics, the extended energy retention of electrons in these crystals broadens the potential applications of perovskites as semiconductors. The findings were published on October 8 in the journal Science under the title “Volatile eutectics to tailor crystallization for perovskite optoelectronics.”
Source: https://engineering.princeton.edu/news/2026/10/13/building-better-solar-tech-crystal-time
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