The new solar cell achieved a maximum power conversion efficiency of 23.75% and a certified efficiency of 23.64%, thus beating the previous world record of 23.35% achieved in 2019 by Japan’s Solar Frontier. The result was confirmed by the Fraunhofer ISE.
Developed by the University of Toledo, the cell achived the highest efficiency ever reported for flexible cadmium telluride solar cells to date. The device reached an open-circuit voltage of 861 mV, a short-circuit density of 27.8 mA/cm2, and a fill factor of 71.7%.
In contrast with traditional panels, thin-film solar modules are much more adaptable to these agricultural situations, thanks to their flexible, lightweight design.
Researchers in Estonia applied for the first time the close-spaced sublimation (CSS) deposition technique to manufacture solar cells based on bismuth trisulfide (Sb2S3). The resulting devices showed limited power conversion efficiency so far, but the scientists claim the new process paves the way for the development of future earth-abundant inorganic PV materials.
US scientists have applied bandgap gradient to a cadmium telluride PV cell for the first time. The result is an improvement of its efficiency and open-circuit voltage, and lower non-radiative recombination.
Swiss scientists have used a minimal amount of silver to alloy the absorber in a thin-film CIGS solar cell. They say this process could help to improve efficiency, open-circuit voltage, and fill factor, while compensating for the low bandgap of the CIGS layer.
Japanese researchers claim that tin sulfide solar cells could achieve higher open-circuit voltages by preventing “Fermi level pinning” from occurring, due to the addition of a tin sulfide interface with large band bending.
Consisting of a two-dimensional (2D) array of rings and pillars, the structure can improve the short-circuit current of a thin-film crystalline solar cell by over 50%, its creators say. The subwavelength AR structures are robust to certain degrees of fabrication errors, they add.
The solar cell was built with Al2O3-incorporated CZTSSe absorbers using aqueous spray pyrolysis in ambient air. It achieved an open-circuit voltage of 0.469 V, a short-circuit current of 36.96 mA cm2, and a fill factor of 67.25%.
The cell may be potentially used as a top subcell in tandem crystalline silicon-based devices. It was built with CdSe thin film with a direct bandgap of 1.72 eV.
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