New contact layers push silicon solar cell efficiency to record highs
In short: Researchers have developed a more efficient way to capture energy from sunlight using silicon heterojunction solar cells. By redesigning the back contact layers with a specific combination of nanocrystalline silicon and a low-resistance transparent oxide, the team achieved power conversion efficiencies of up to 26.81% on industrial-sized wafers.
The study focused on improving how electricity moves through the back junction of a solar cell. By replacing standard amorphous silicon with a p-type doped nanocrystalline structure, the team reduced electrical resistance and improved the movement of charge carriers.
The researchers tested these components on large, industry-grade wafers to ensure the technology could be scaled for commercial use. However, as this was a laboratory demonstration of a specific material optimization, the study does not account for long-term environmental durability in real-world conditions.
Why it matters: Refining the microscopic materials used in solar cell contacts can significantly boost the amount of electricity we can harvest from the sun.
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