Korean scientists achieve 25.8% effectiveness for solitary junction perovskite solar cell

• The record efficiency was gotten thanks to an interlayer put between the electron-transporting layer and the perovskite layer, which removed the requirement for passivation. The cell was additionally able to preserve around 90% of its first effectiveness after 500 hours under common illumination.

Scientists at South Korea's Ulsan National Institute of Science and Technology (UNIST) insurance claim to have accomplished a power conversion efficiency of 25.8% for a solitary junction perovskite solar cell without the requirement for passivating the surface of the perovskite layer to decrease interfacial problems.

The scientists claimed the result is a world record for this sort of solar cell and that the U.S. Department of Energy's National Renewable Energy Laboratory (NREL) accredited the accomplishment of a 25.5% efficiency for the device.

The cell was developed with an interlayer between a tin(IV) oxide (SnO2) electron-transporting layer and a layer constructed from a halide perovskite layer by combining chlorine-bonded SnO2 with a perovskite forerunner having chlorine. "This interlayer has atomically coherent functions which boost charge removal and transport from the perovskite layer; and less interfacial defects," the academics clarified.

The defect-free link layer is claimed to remove the risks connected to passivation, which might not always supply the wanted user interface flaw reduction, as the surface-treatment agents on the electron-transporting layer may liquify while finish the perovskite thin film.

The cell was also able to keep around 90% of its initial efficiency after 500 hours under typical illumination. "Our searchings for offer standards for designing defect-minimizing user interfaces between steel halide perovskites and electron-transporting layers," stated UNIST researcher Seok Sang-il.

The strategy to create the solar cell exists in the research Perovskite solar cells with atomically systematic interlayers on SnO2 electrodes, which was just recently released in nature.

In April, a group of researchers from UNIST and the Swiss Federal Institute of Technology Lausanne (EPFL) achieved a conversion efficiency of 25.6% in a single-junction perovskite solar cell. The outcome slips by the previous record of 25.2%, attained in February by researchers at the Massachusetts Institute of Technology (MIT), and UNIST's earlier outcome of 25.17%, achieved in November 2020.