Bilayer approach ramps performance of all-perovskite triple-junction solar cells
A novel graphene oxide bilayer pushes triple-junction perovskite solar cells to a milestone 27.3% efficiency with unprecedented operational longevity The post Bilayer approach ramps performance of all-perovskite triple-junction solar cells appeared first on Physics World .
Researchers at Helmholtz-Zentrum Berlin (HZB) have developed an all-perovskite triple-junction solar cell that breaks the efficiency barrier, reaching 27.3%. Triple-junction cells stack three perovskite sub-cells tuned to capture different parts of the solar spectrum, allowing them to surpass the efficiency limits of single-junction cells.
However, traditional PEDOT:PSS layers used to extract positive charges from the narrow-band-gap tin-lead sub-cell caused severe optical and electrical losses. To overcome this, HZB researchers introduced a graphene oxide and self-assembled monolayer (SAM) bilayer. This bilayer effectively suppresses losses, providing both high efficiency and stability.
By replacing PEDOT:PSS with this bilayer, the efficiency of the narrow-band-gap sub-cell was enhanced, leading to a record-breaking triple-junction efficiency of 27.3%. The chemically stable bilayer interface also demonstrated exceptional longevity, retaining 90% of its initial performance after 770 hours of continuous operation. The researchers project that further optimization could push the efficiency beyond the 30% mark.
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