A titanium solar cell with 24% efficiency

The Australian research team which developed the device said the higher efficiency was achieved through a nanowire design which eliminates the interface inside the titanium dioxide band.

Scientists at Australia’s Queensland University of Technology have developed a quantum dot, titanium dioxide (TiO₂) solar cell they claim offers better efficiency more cheaply than traditional crystalline silicon cells, as well as being more eco-friendly.

The researchers claim the cell boasts 24% efficiency, more than double the 8-11% lab-level performance observed in standard TiO₂ quantum dot devices.

Some photons become trapped in the interface between nanocrystals in typical TiO₂ quantum dot cells but the Queensland team claim to have removed the problematic interfaces.

“Our nanowire design eliminates the interface inside the TiO₂ band, as it’s just a single layer of QD [quantum dot] -coated TiO₂,” said research coordinator Ziqi Sun. “If we can remove this disordered interface, we can improve efficiency.”

Commercial production

The nanowire crystal used for the cell was assembled in China with an advanced transmission electron microscope.

The research group said their cell concept could be expanded to bring the technology to production.

Most dye-sensitized – Grätzel – solar cells are based on titanium dioxide thin film – a cheap and harmless, water-insoluble inorganic material which is commercially available and widely used in industrial applications.

Low efficiency has remained the chief obstacle preventing such materials competing with crystalline silicon cells to date.

Titanium has also been used recently to raise the efficiency of perovskite cells. Research projects of that nature have been carried out by Japan’s Kanazawa University and scientists from Russia’s National University of Science and Technology and Rome’s Tor Vergata University.

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