Perovskite solar modules are on the brink of surpassing conventional silicon-based solar systems—not just in efficiency but also in cost-effectiveness. With the potential to achieve an impressive 26% efficiency, they are poised to overtake the common 20% efficiency mark of existing solar installations. Moreover, by combining perovskite with silicon technologies, industry experts foresee the likelihood of realizing efficiencies up to 40%. At this rate, the average household rooftop could become a powerhouse, sufficiently catering to private electricity needs.
However, a significant hurdle remains: the durability of perovskite solar cells. Unlike their silicon counterparts that can sustain 80% performance even after two decades, perovskite structures degrade, losing efficacy within months to a year under sun exposure.
A study by MIT researchers, in collaboration with industrial partners, has now revealed an innovative approach that could leapfrog the performance and longevity of perovskite, and potentially perovskite-silicon tandem solar cells. This technology zeroes in on the crux of the matter by addressing both durability and efficiency simultaneously.
The process involves submerging the fragile perovskite element in a salt solution containing hexylammonium bromide. This treatment not only mends the flaws in the crystal structure but also creates a protective film on the surface. By doing so, it enhances the efficiency slightly and, more importantly, fortifies the material against the disintegration typically triggered by light-to-electricity conversion.
Researchers have indicated that this is just the beginning. Through varying the composition of the perovskite modules and the specific salt solutions, they anticipate even more promising outcomes. While this technology is still in its experimental phase, projections suggest that market-ready production could be achievable within a few years. The prospect of having enduring large-scale solar installations with two-decade-old tandem cells that still produce cost-effective electricity is a compelling vision for sustainable energy’s future.
