CEA-INES researchers report 18% power conversion efficiency for perovskite solar modules

A team of researchers at the French National Solar Energy Institute (INES) at the country’s Alternative Energies and Atomic Energy Commission (CEA) has announced achieving 18% power conversion efficiency of perovskite solar modules.

They were able to achieve this level on an active surface area of 10 cm² under illumination of 1 STC sun, using a coating step carried out in air followed by a gas quenching conversion step to form the desired perovskite material. This material was developed without methyl ammonium comprising multi-cations and a mix of halogens.

Researchers develop a new approach to improving the efficiency of perovskite-based solar cells

A team of researchers at MIT (along with colleagues from South Korea and Georgia) has developed a new approach to the design of perovskite cells by adding a specially treated conductive layer of tin dioxide bonded to the perovskite material, which provides an improved path for the charge carriers in the cell. By also modifying the perovskite formula, the researchers have reportedly boosted its overall efficiency as a solar cell to an impressive 25.2%.

On top of many other attractive properties, perovskites have a higher bandgap than silicon, which means they absorb a different part of the light spectrum and thus can complement silicon cells to provide even greater combined efficiencies. But even using only perovskite, MIT's Jason Yoo says, “what we’re demonstrating is that even with a single active layer, we can make efficiencies that threaten silicon, and hopefully within punching distance of gallium arsenide. And both of those technologies have been around for much longer than perovskites have.”

Flexible semi-transparent tandem perovskite/CIGS solar cell with 26.5% efficiency reported by Solliance and MiaSolé

Solliance and U.S-based MiaSolé announced a new record - power conversion efficiency of 26.5% on a tandem solar cell that combined a top rigid semi-transparent perovskite solar cell with a bottom flexible copper indium gallium selenide (CIGS) cell.

Solliance and Miasole's 23%efficiency tandem perovskite/CIGS cells image

This impressive efficiency was achieved by optimizing the bandgap and the efficiency of both the rigid semi-transparent perovskite top cell and the flexible CIGS bottom cell. The CIGS was roll to roll produced on steel foil, with a power conversion efficiency of 20.0%.

Dual Passivation technique yields perovskite solar cells with 20.14% efficiency

Researchers from the Shaanxi Normal University in China have designed a perovskite solar cell based on methylammonium lead iodide (MAPbI3) through a dual passivation technique that simultaneously passivates trap defects in both the perovskite and electron transport layer (ETL) films.

“So far, most techniques for modifying perovskite solar cells focus on either the perovskite or electron transport layer,” the research group reported, noting that the ETL must have decent optical transmittance and high electron mobility to extract photo‐induced carriers and contribute to the solar cell efficiency.

Researchers develop mini perovskite solar modules with increased film thickness

A research team from the Okinawa Institute of Technology (OIST) in Japan has developed a mini perovskite solar module based on large‐area uniform and dense perovskite films with a thickness of more than one‐micrometer.

The scientists fabricated two modules, sized 5x5cm2 and 10x10cm2, with efficiencies of 14.55% and 10.25%, respectively, which reportedly rely on perovskite layers with high crystallinity, large grain sizes, and small surface roughness.