Scientists from the National Renewable Energy Laboratory (NREL) managed to create the first solar cell with a quantum efficiency of more than 100%.
efficiency is the ratio of the number of electrons that have arisen in
the chain of the solar cell to the number of photons of a certain
wavelength, incident on the surface per unit time. Given that a high-energy photon could "knock out" a few electrons, the quantum efficiency can exceed 100%.
NREL specialists managed to get 114% rate. For an item that works on radiation impinging in the solar spectrum, a value obtained for the first time.
key to success, according to scientists, was the use of multi-exciton
generation effect, in which one absorbed photon creates a single pair of
a mechanism is particularly effective in the so-called "quantum dots" -
nanocrystals of the semiconductor, which begin to appear essentially
Scientists managed to create the first solar cell with a quantum efficiency greater than 100%
a record efficiency solar cell using materials such as zinc oxide and
lead selenide (precisely because it was to form "quantum dots"). The
researchers hope that their development in the future will lead to
solar panels that produce electricity that could cost competitive with
electricity from other sources.