Light Trapping Scheme Makes Ultrathin Solar Cells Much Better
A team of researchers from the University of Illinois at Urbana-Champaign and the University of Central Florida in Orlando implemented light trapping schemes with 3 μm thick silicon solar cells, achieving energy conversion efficiencies that are higher by ≈190% compared to otherwise identical cells that do not exploit light-trapping features.
Researchers have created large sheets of nanotextured, silicon micro-cell arrays that hold the promise of making solar cells lightweight, more efficient, bendable and easy to mass produce.
The team used a light trapping scheme based on a nanoimprinting technique where a polymeric stamp mechanically emboss the nano-scale pattern on to the solar cell without involving further complex lithographic steps. This approach has led to the flexibility researchers have been searching for, making the design ideal for mass manufacturing, said UCF assistant professor Debashis Chanda, lead researcher of the study.
Previously, scientists had suggested designs that showed greater absorption rates of sunlight, but how efficiently that sunlight was converted into electrical energy was unclear, Debashis said. This study demonstrates that the light trapping scheme offers higher electrical efficiency in a lightweight, flexible module.
The team believes this technology could someday lead to solar-powered homes fueled by cells that are reliable and provide stored energy for hours without interruption.
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