A Material for Super Efficient Solar Cells
Colloidal Quantum Dots (CQD) are the materials that can convert energy from the entire solar spectrum. Whereas, the earlier semiconducting materials commonly used in photovoltaic cells could convert only a portion of the sun’s rays into electricity.
By controlling the size of the semiconductor nano-particles quantum dots researchers can make the material harness different frequencies of light.
Researchers from University of Toronto, Canada, and King Abdullah University of Science and Technology (KAUST) in Thuwal, Saudi Arabia, have made the most efficient CQD cell yet.
It was done by using a combination of organic and inorganic chemistry, they have been able to eliminate electron traps associated with the large internal surface areas of the nano particles, and keep the films so dense that they absorb as much light as possible.
According to the paper published, small chlorine atoms introduced immediately after synthesizing the dots in this technology and they were able to patch the previously unreachable nooks and crannies that lead to electron traps. The scientists followed that by using short organic linkers to bind quantum dots in the film closer together. This twofold process of hybrid passivation was shown to lead to record film densities discerned the structure of the CQD films at sub-nanometer resolution using state-of-the-art Synchrotron X-ray scattering methods. These advances open up new avenues for the improvement of CQD cell ef‑
ficiencies, bringing the prospect of low cost solar energy nearer.
This work shows that the abundant materials interfaces inside colloidal quantum dots can be mastered in a robust manner, proving that low cost and steadily-improving efficiencies can be combined