Perovskite solar cell with 24.33% effectiveness by means of ionic liquid topping layer

Jan 10, 2022 01:03 PM ET
  • Developed by scientists in China, the cell attained an open-circuit voltage of 1.192 V, and also a fill element of 80.67%. Its perovskite topping layer was treated with a special ionic liquid that had a favorable impact on both the tool's performance as well as stability.
Perovskite solar cell with 24.33% effectiveness by means of ionic liquid topping layer
Image: Shaanxi Normal University

Researchers in China have produced a perovskite solar cell with a novel defect passivation technique based upon the use of an ionic liquid (IL) perovskite topping layer.

ILs are non-molecular substances that are composed only of ions. They are declared to have several benefits over traditional natural solvents, such as minimal vapor stress at area temperature level as well as high thermal stability.

The cell was developed with a perovskite material known with the formula CH( NH2) 2PbI3 (FAPbI3), which was treated with an IL known as 1-ethyl-3methylimidazolium bromide ([ EMIM] Br). "The IL can stabilize the perovskite by creating strong chemical bonds with the soft perovskite

thin movies that can mainly hamper the loss of perovskite elements as well as subdue trap-state thickness in the grain boundaries and also at the user interfaces," the researchers discussed.

The gadget was built on a fluorine-doped tin oxide (FTO) substrate, a Tin( IV) oxide (SnO2) layer, the perovskite film, a spiro-OMeTAD hole-blocking layer, as well as a gold (Au) steel get in touch with.

According to the scientists, the [EMIM] Br molecules on the perovskite surface area are able to reduce the non-radiative recombination that primarily occurs at the perovskite flaws that are passivated, therefore enhancing charge service provider transportation with minimized non-radiative recombination loss, which subsequently causes an increase of both open-circuit voltage and also fill factor.

The cell accomplished a power conversion performance of 24.33%, an open-circuit voltage of 1.192 V, as well as a fill variable of 80.67%. For comparison, a referral gadget without any [EMIM] Br-treatment got to a performance of 22.67%, an open-circuit voltage of 1.147 V, and a fill element of 78.49%.

With this cell innovation, the academics likewise fabricated a tiny perovskite solar component with an energetic location of 10.75 centimeters. The panel achieved a performance of 20.33%, an open-circuit voltage of 5.97 V, a short-circuit current of 47.76 mA, and a fill factor of 76.67%. "In addition, the bare device preserves over 90% of its preliminary performance after 700 hours of aging at 65 degrees Celsius," they highlighted. "It likewise shows outstanding stability with only about 10% deterioration after being revealed to the ambient environment for 1,000 hrs."

A complete summary of the solar cell can be located in the paper "Ionic-Liquid-Perovskite Capping Layer for Stable 24.33%-Efficient Solar Cell," published in Advanced Energy Materials. The study team comprises scientists from China's Shaanxi Normal University as well as the Chinese Academy of Sciences.

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