Researchers from the school of photovoltaic and renewable energy engineering at the University of New South Wales in Australia and the center of excellence in exciton science recently found that the use of singlet fission and tandem solar cells can produce solar energy more efficiently, while helping to reduce operating temperature and prolong the service life of equipment, Introduce a new paradigm for the development of new generation solar technology.
Series cell can be composed of new compounds such as silicon and perovskite nanocrystals. Perovskite nanocrystals have larger band gap than silicon, which is helpful for devices to capture more solar spectrum for power generation.
The best solution of traditional solar cells is that each photon produces an electron as the carrier of electric energy. The electron produced by singlet fission is twice as much as that in the traditional case, that is, one photon excites two electrons. One of the devices for singlet fission is tetrabenzene, which can transfer the energy from singlet fission to silicon.
Scientists and engineers around the world are trying to find the best way to integrate series cells and singlet fission processes into commercial solar devices to replace traditional single junction silicon solar cells commonly found in roofs and large-scale arrays.
This time, some key advantages of series batteries and singlet fission have been highlighted in the work of the researchers. Researchers have shown that both silicon / perovskite series cells and singlet fission cells based on tetrabenzene can operate at lower temperatures than conventional silicon devices. This will reduce the impact of heat loss on the equipment, extend the service life of the equipment, and reduce the energy cost of equipment production.
For example, the working temperature of the module is reduced by 5 ℃ – 10 ℃, which is equivalent to an increase of 2% – 4% in annual power generation. It is usually found that the lifetime of the device doubles when the temperature decreases by 10 ℃. This means that the life of tandem cells is increased by 3.1 years and that of singlet fission cells is increased by 4.5 years.
In addition, singlet fission cells have another advantage. When tetrabenzene is inevitably degraded, it will become transparent to solar radiation, making the battery continue to play the role of traditional silicon devices.
“The commercial value of photovoltaic technology can be achieved by improving energy conversion efficiency or extending operating life,” said Dr. Jessica Ajie, the lead author of the research. The former is the main driving force for the development of next-generation technology, while the latter, the potential life advantage, is hardly considered.