Key facts
- New perovskite solar cells can generate electricity underwater.
- The cells are tuned to absorb wavelengths of light present underwater.
- An additive was used to create a water-repelling layer and stabilize the perovskite crystal lattice.
- The additive also improved the solar cell's electricity production.
Researchers at Yunnan University, led by Simin Ma, have developed novel perovskite solar cells designed to function underwater. Unlike traditional silicon solar cells, perovskite cells can be manufactured cheaply, take on various forms, and offer higher energy conversion efficiency, though they typically degrade quickly. The new design addresses this by tuning the perovskite material to absorb specific wavelengths of light that penetrate water, potentially extending the cells' lifespan in cooler, lower-light underwater conditions. A key innovation is the use of polyhexamethylene guanidine hydrochloride as an additive. This compound not only creates a water-repelling layer but also integrates with the perovskite crystal lattice, promoting larger crystal formation and preventing ion movement, which are common causes of degradation. This additive simultaneously enhances the material's durability and its electricity generation capabilities.