Photon Recycling, the Secret Ingredient for Higher Perovskite Solar Efficiency

The researchers from Technische University, Dresden have been able to re-use or recycle photons and find impressive light emission effects in perovskite solar cells, resulting higher efficiency in solar energy preservation. The research results papers are available in the journal of Science Advances.

Photoluminescence & Higher Solar Conservation

The findings say that when a photon gets radiated inside the re-absorbing semiconductors such as perovskites, it easily gets re-absorbed by the emitter and thus, a new photon gets generated through ‘photoluminescence’. This cycle of reabsorbing and reemitting of the photons is known as ‘Photon Recycling’. The IAPP researchers find the photon recycling and light scattering to be significantly improving the light emitting emission efficiency by a factor of ~ 5, thus considerably enhancing the photovoltage of perovskite solar cells.

The lead researcher Dr. Changsoon Cho,Humboldt research fellow at IAPP says, the Perovskites are already excellent absorbers. It’s now time to enhance their light emitting ability even more and improve their already existing high power conversion efficiency. In order to do so, understanding photon recycling is an important step forward in this direction.

Further, the researchers have been able to establish that using photon recycling, the upper limit of perovskite solar cells efficiency been able to reach 31.3% from 29.2%. Their findings also envision that using photon recycling and suppression of other optoelectrical losses will further result in better performance in the near future. “Our research shows the potential of the technology, however much efforts in research are a must before the technology can get into mass production”, points Prof Karl Leo, the award-winning European Inventor and IAPP head.