Researchers are proposing a novel, physics-based approach to synthesizing perovskites.
, the researchers propose a novel, physics-based approach to synthesize perovskites, instead of going the usual way and doing it in a wet lab, and then applying the material as a film on a glass substrate to explore various applications.By using a substrate of either a layer of metal or alternating layers of metal and dielectric material—rather than glass— the scientists found they could increase the perovskite’s light conversion efficiency by 250%.
According to Guo, metals are probably the simplest materials in nature, but they can be made to acquire complex functions. His lab has pioneered a range of technologies transforming simple metals to pitch black, superhydrophilic , or superhydrophobic . The enhanced metals have been used forIn this new paper, instead of presenting a way to enhance metals themselves, the Guo Lab demonstrates how to use metals to enhance the efficiency of perovskites.
Guo pointed out that in a solar cell, photons from sunlight need to interact with and excite electrons, causing the electrons to leave their atomic cores and generate an electrical current. Ideally, the solar cell would use materials that are weak to pull the excited electrons back to the atomic cores and stop the electrical current.
The result was a significant reduction of electron recombination through “a lot of surprising physics,” according to Guo. In effect, the metal layer serves as a mirror, which creates reversed images of electron-hole pairs, weakening the ability of the electrons to recombine with the holes.
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