Efficient tandem solar cell developed using wide bandgap perovskites

An international research team has developed a new type of solar cell that can both withstand environmental hazards and is 26.7% efficient in power conversion.

Highly efficient and stable double layer solar cell developed​ imageStructure and photovoltaic performance for the perovskite-Si tandem device. Image by KAIST

The researchers, led by Byungha Shin, a professor from the Department of Materials Science and Engineering at KAIST, focused on developing a new class of light-absorbing material, called a wide bandgap perovskite. The material has a highly effective crystal structure that can process the power needs, but it can become problematic when exposed to environmental hazards, such as moisture. Researchers have made some progress increasing the efficiency of solar cells based on perovskite, but the material reportedly has greater potential than what was previously achieved.

KAUST and University of Toronto team develops perovksite-silicon tandem cell with 25.7% efficiency

Scientists from the King Abdullah University of Science and Technology (KAUST) in Saudi Arabia and University of Toronto, have developed a perovskite-silicon tandem solar cell which they claim showed excellent operational stability under accelerated tests.

The device was made by combining solution-processed, micrometer-thick perovskite top cells with fully textured silicon heterojunction bottom cells.

ANU reaches 27.7% efficiency with silicon/perovskite tandem solar cell

Researchers at The Australian National University (ANU) have announced an impressive achievement - a silicon/perovskite tandem solar cell with a conversion efficiency of 27.7%.

Professor Kylie Catchpole says this would only need to improve slightly - to around 30% - before the technology could be rolled out around the world. "In comparison, typical solar panels being installed on rooftops at the moment have an efficiency around 20%" Professor Catchpole said.

A change in chemical composition could boost stability of perovskite solar cells

Researchers from Colorado University in Boulder with the US Department of Energy’s National Renewable Energy Laboratory (NREL) have shown how a change in chemical composition managed to boost the longevity and efficiency of a perovskite solar cell.

The new formula reportedly enabled the solar cell to resist a stability problem that has so far thwarted the commercialization of perovskites. The problem is known as light-induced phase-segregation, which occurs when the alloys that make up the solar cells break down under exposure to continuous light.

A new manufacturing method based on pre-nucleation yields efficient perovskite solar cells

Researchers from Peking University in China have developed a manufacturing method for perovskite solar cells using a pre-nucleation technique. Compared to traditional solvent dripping methods, the approach enables the creation of smaller crystallites in the perovskite films as uncontrolled crystallite growth affects the efficiency and durability of cells.

The technique aims to avoid the efficiency loss caused by humidity linked to the interactions of ambient water and oxygen with the perovskite precursors and substrate used during cell production.