All-perovskite tandem solar panel with 19.1% efficiency

• German scientists have created a two-terminal, all-perovskite solar panel with laser scribing as well as module interconnections. It has a fill factor of 75%.

Scientists at the Karlsruhe Institute of Technology (KIT) in Germany have actually fabricated a spin-coated, two-terminal, all-perovskite tandem solar module with an aperture location of 12.25 square centimeters and also a geometric fill element of 94.7%.

They said the laser-scribed two-terminal all-perovskite tandem (2TPT) solar cells have actually stimulated rate of interest at the research study degree in the last few years, as they integrate a wide bandgap perovskite top subcell with a narrow-bandgap perovskite bottom subcell.

The researchers utilized a 23-5% effective 2TPT solar cell based upon perovskite and copper/indium/selenium (CIS) thin-film, which they initially announced in June. It has an open-circuit voltage of 1.59 V, a short-circuit current of 19.4 mA centimeters-- 2, and a fill variable of 75.5%.

The German group utilized a custom-built laser-scribing set up for the manufacturing of the monolithic interconnections of the solar modules.

"The set-up permits pattern in an inert environment to prevent oxygen exposure as well as degradation of the slim bandgap bottom subcell throughout the scribing procedure," they claimed, noting that they made use of vacuum-assisted development control (VAGC) to extract all solvents in the deposition process of the bottom cell on top of the top cell.

They claimed the module interconnections had a very little effect on the tool's performance, which resulted in an open-circuit voltage loss of just 10 mV per cell red stripe.

"Our modules preserve a high fill variable of 75%, showing a negligible detrimental effect of presented module interconnections," they stated.

The solar module accomplished a power conversion effectiveness of 19.1% and a smaller variation with an aperture area of 2.56 square centimeters reached an effectiveness of 22.2%.

"The prototype module provides 95% of first power conversion performance for 15-hout MPP tracking under constant AM 1.5 G illumination," the scientists stated.

They introduced the module in "Scalable two-terminal all-perovskite tandem solar modules with a 19.1% efficiency," which was recently published in Nature Energy.

"By means of electroluminescence imaging and laser-beam-induced current mapping, we show the uniform existing collection in both subcells over the entire module area, which clarifies low losses in open-circuit voltage and also fill variable for our scalable modules," they said.