Key Findings
A research team from Princeton Engineering, the University of California-San Diego, and Sungkyunkwan University has developed a method to reduce atomic-scale defects in perovskite solar cells. By introducing a specific chemical mixture during fabrication, the team achieved a significant increase in the time electrons retain excess energy absorbed from sunlight—roughly ten times longer than in untreated materials. According to assistant professor Dane deQuilettes, this improvement could result in a one percent gain in power generation for existing cutting-edge perovskite cells.
Technical Details
The process utilizes a volatile eutectic—a mixture of zinc bromide and methyl ammonium chloride that possesses a lower melting point than either component alone. This mixture is added early in the fabrication process to alter how the perovskite crystal grows, resulting in a more ordered lattice with fewer imperfections. In treated perovskites, electrons retained their energy for up to 300 microseconds, which is approximately one hundred thousand times longer than in many other semiconductors. This prevents excited electrons from being trapped by lattice defects and dissipating their energy as heat before it can be collected as electricity.
Background & Context
Perovskites offer advantages over traditional silicon solar cells because they can be prepared from liquid precursors and printed like ink, potentially reducing costs and sustainability hurdles. Current industry trends are moving toward tandem devices, where a thin layer of perovskite is applied over a silicon cell to generate approximately 40 percent more power than single-material cells. However, the printing and layering process typically introduces the atomic-level defects that this new eutectic method aims to eliminate.
Significance & Outlook
The discovery, published in the journal Science, addresses a critical bottleneck in the scalability of high-efficiency photovoltaics. With global electricity demand rising due to the growth of artificial intelligence and datacenter infrastructure, even single-digit percentage gains in power conversion are considered substantial in utility-scale solar economics, where installations cover thousands of acres.
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