Perovskite solar cells (PSCs) can offer high light-conversion efficiency with low manufacturing costs. But to be commercially viable, perovskite films must also be durable and not degrade under solar light over time.
Although perovskite solar cells have only been developed within the past few years, they are already almost as energy-efficient as silicon.
The researchers have built solar cells that have power conversion efficiencies averaging 18 percent – with some as high as 20 percent.
Researchers have uncovered the exact mechanism that causes new solar cells to break down in air, paving the way for a solution.
So far, efforts have been focused on improving perovskite solar cell efficiency by optimizing their architecture and the fabrication processes.
The mechanism behind the new solid-state solar cell made of the mineral perovskite relies on so-called polaron excitations, which combine the excitation of electrons and vibrations of the crystal lattice.