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A perovskite solar cell was “sprinkled with salt” and achieved an efficiency of over 25%

A perovskite solar cell was

Eu(TFSI) salt enabled perovskite cells to instantly gain high conductivity and ensure perfect operation without the need for further processing.

Researchers from Northwest Polytechnic University of China have proposed a new lithium-free doping strategy for perovskite solar cells. Salt-doped photovoltaic device achieves record efficiency of 25.45%, pv-magazine.com reports , made from spiro-OMeTAD, which is reported to provide excellent levels of efficacy and stability.

Spiro-OMeTAD is usually doped with a compound known as lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) to improve holes and conductivity. However, this type of doping requires long-term air oxidation for 24 hours, which is an obstacle for the commercial production of perovskite photovoltaic cells.

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Insufficient doping efficiency of this post-processing process can lead to the retention of unreacted reagents and/or harmful by-products in the doped spiro-OMeTAD layer, adversely affecting device performance. In addition, a significant problem limiting their practical application is the trade-off between high efficiency and stability.

To solve this problem, scientists used a salt known as Eu(TFSI) for doping. This salt can generate oxygen and promote the pre-oxidation of spiro-OMeTAd. Unlike conventional doping, air-exposed LiTFSI enables perovskite cells to instantly achieve high conductivity and achieve ideal performance without the need for further processing.

Using this doping strategy, the researchers built a solar cell with a fluorine-doped glass substrate tin oxide, an electron transfer layer based on titanium oxide, a perovskite absorber and a gold contact.

Tested under standard lighting conditions, this solar cell achieved an energy conversion efficiency of 25.45%, an open-circuit voltage of 1.210 V, a current density short circuit of 25.41 mA cm2 and fill factor of 82.50%. A LiTFSI-doped control cell with the same architecture achieved an efficiency of only 23.19%.

Natasha Kumar

By Natasha Kumar

Natasha Kumar has been a reporter on the news desk since 2018. Before that she wrote about young adolescence and family dynamics for Styles and was the legal affairs correspondent for the Metro desk. Before joining The Times Hub, Natasha Kumar worked as a staff writer at the Village Voice and a freelancer for Newsday, The Wall Street Journal, GQ and Mirabella. To get in touch, contact me through my natasha@thetimeshub.in 1-800-268-7116

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