Quantum Dot Solar Cells (QDSC)

Solterra Renewable Technologies solar energy solution will compete on a non-subsidized basis with the price of retail electricity in key markets worldwide. Revolutionary 3rd-generation quantum dot solar cells (QDSC) utilizing high-volume synthesis  of quantum dots formulated as the broad-spectrum photon absorber in solar cells and using high-speed roll-to-roll printing technologies can effectively convert solar energy to electricity at less than half the price of competition.

Multiple Exciton Generation (MEG)

Quantum dots have several very unique qualities that are the primary result of their small sizes and the optical and electrical effects at these dimensions. One of the most interesting and most significant is their ability to create multiple exciton generation when the absorption of a photon results in twice the bandgap energy and produces two or more electron-hole pairs. The MEG effect is important because the National Renewable Energy Laboratories (NREL) in 2005 reported it creates the potential to harvest 3 electrons per photon from the sun, and Los Alamos National Laboratory in 2006 published MEG of up to 7 electrons for each photon. This is a singular advantage for quantum dot solar cells because this phenomenon does not readily occur in bulk semiconductors (silicon solar modules) where the excess energy simply dissipates away as heat. This phenomenon is the key to exponential increases in conversion efficiency for quantum dot solar cells.

The NREL also found that the photon conversion efficiency was enhanced by “the formation of intermediate bands in the bandgap that use sub-bandgap photons to form separable electron–hole pairs” and, “By means of the intermediate band, it is possible to absorb below-bandgap energy photons. This is predicted to produce solar cells with enhanced photocurrent without voltage degradation.”