Researchers from Korea University are paving the way for more efficient and cost-effective renewable energy generation by utilizing gold nanospheres designed to capture light across the entire solar spectrum.
Hung Lo et al. introduced plasmonic colloidal superballs as a versatile platform for broadband solar energy harvesting. Image credit: Hung Lo et al., doi: 10.1021/acsami.5c23149.
Scientists are exploring novel materials that efficiently absorb light across the solar spectrum to enhance solar energy harvesting.
Gold and silver nanoparticles have been identified as viable options due to their ease of fabrication and cost-effectiveness, yet current nanoparticles primarily absorb visible wavelengths.
To extend absorption into additional wavelengths, including near-infrared light, researcher Seungwoo Lee and colleagues from Korea University propose the innovative use of self-assembled gold superballs.
These unique structures consist of gold nanoparticles aggregating to form small spherical shapes.
The diameter of the superball was meticulously adjusted to optimize absorption of sunlight’s diverse wavelengths.
The research team first employed computer simulations to refine the design of each superball and predict the overall performance of the superball film.
Simulation outcomes indicated that the superball could absorb over 90% of sunlight’s wavelengths.
Next, the scientists created a film of gold superballs by drying a solution containing these structures on a commercially available thermoelectric generator, a device that converts light energy into electricity.
Films were produced under ambient room conditions—no cleanroom or extreme temperatures needed.
In tests using an LED solar simulator, the average solar absorption rate of the superball-coated thermoelectric generator reached approximately 89%, nearly double that of a conventional thermoelectric generator featuring a single gold nanoparticle membrane (45%).
“Our plasmonic superball offers a straightforward method to harness the entire solar spectrum,” said Dr. Lee.
“Ultimately, this coating technology could significantly reduce barriers for high-efficiency solar and photothermal systems in real-world energy applications.”
The team’s research is published in the journal ACS Applied Materials & Interfaces.
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Ro Kyung Hoon et al.. 2026. Plasmonic Supraball for Scalable Broadband Solar Energy Generation. ACS Applied Materials & Interfaces 18 (1): 2523-2537; doi: 10.1021/acsami.5c23149
Source: www.sci.news
