Researchers from the University of Groningen in the Netherlands have identified a mechanism that slows the cooling of hot electrons in tin-based materials by approximately 1000 times. This discovery addresses the rapid energy loss that typically occurs when electrons convert solar photons into electricity.
The phenomenon is driven by the simultaneous interaction of two physical effects. The hot phonon bottleneck causes the surrounding environment to heat up, forcing electrons to reabsorb thermal energy. Simultaneously, the Burstein-Moss effect fills lower energy levels, creating a barrier that prevents other electrons from shedding excess energy.
This combined process effectively traps energy within the electrons for a significantly longer duration. Scientists suggest that applying this mechanism to solar cells could allow manufacturers to surpass the current theoretical efficiency limit for solar energy conversion, which is currently estimated at 33 percent.
The findings were detailed in the journal ACS Energy Letters. The research team notes that the specific combination of electronic, phononic, and chemical properties under intense light creates the necessary conditions for this extended cooling, offering a potential path for future high-efficiency solar devices.
