Bringing to Light the Strengths of Semiconductors
Adding light while firing the processing semiconductor material in a furnace at high temperatures generates extra electrons. This, in turn, changes the composition of the material. Through running simulations of the process, it was discovered that firing the material in a dark furnace does produce a material with different properties.
The effect of shining light on this material is beneficial and results in the suppression of defects. Such defects may include difficulties in controlling the conductivity of the material, difficulties in the ability to efficiently convert sunlight into electrical energy and difficulties with the efficient emission of light.
(Image courtesy of University of Utah College of Engineering.)
These are useful in a variety of applications, but due to their multichemical elemental makeups, they have increased susceptibility to atomic-scale material defects. As previously mentioned, shining a light throughout the manufacturing of these materials reduces the defects encountered.
Shedding Light on the Future of Semiconductors
Historically, it was believed that the amount of defects in semiconductors was determined by the processing conditions, especially in terms of temperature and pressure. This discovery works light into the fundamentals of semiconductor processing.
The next steps involve testing the predictions made by simulations in order to produce better semiconductors. It is believed that this could improve solar panel efficiency with cadmium telluride thin films, as well as silicon films. In addition to solar panels, these improvements will likely be felt across the manufacturing of computer chips and light-emitting diodes.
The engineering researchers behind this development represent the University of Utah as well as the National Renewable Energy Laboratory in Golden, Colo.
For further reading on photovoltaics, check out this article on record-setting efficiencies.