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Related Concept Videos

Voltaic/Galvanic Cells02:47

Voltaic/Galvanic Cells

Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...

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Related Experiment Video

Updated: Jun 11, 2026

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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Lithium-Based Deep Eutectic in Spiro-OMeTAD Enable Efficient and Stable Perovskite Solar Cells.

Hao Zhang1, Ying Sun2, Jiahao Guo1

  • 1College of Chemistry, Zhengzhou University, Zhengzhou, P. R. China.

Angewandte Chemie (International Ed. in English)
|April 16, 2026
PubMed
Summary

A novel deep eutectic mixture using 2,2'-dipyridyl disulfide (DpyDS) with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) enhances perovskite solar cell (PSC) stability and efficiency. This strategy suppresses ion migration and improves hole transport for high-performance devices.

Keywords:
Spiro‐OMeTADdeep eutectic mixturehole extractionperovskite solar cell

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • High efficiency in n-i-p type perovskite solar cells (PSCs) relies on doping Spiro-OMeTAD with LiTFSI.
  • Li+ ion migration and LiTFSI's hygroscopic nature compromise PSC long-term stability.
  • Addressing these limitations is crucial for commercial viability.

Purpose of the Study:

  • To develop a novel doping strategy for Spiro-OMeTAD in PSCs.
  • To enhance both the power conversion efficiency (PCE) and operational stability of PSCs.
  • To investigate the role of 2,2 -dipyridyl disulfide (DpyDS) in a LiTFSI-based system.

Main Methods:

  • Formation of a room-temperature deep eutectic mixture of DpyDS and LiTFSI.
  • Utilizing the DpyDS-LiTFSI mixture as a dopant in the Spiro-OMeTAD hole transport layer.
  • Characterization of the resulting film's properties, including ion suppression and hole mobility.
  • Fabrication and testing of PSC devices under operational stress.

Main Results:

  • The DpyDS-LiTFSI mixture effectively suppresses Li+ diffusion and repairs pores in the hole transport layer.
  • DpyDS enhances Spiro-OMeTAD hole mobility and facilitates TFSI- dissociation, improving charge extraction.
  • PSC devices achieved a certified PCE of 26.37% and retained 90.5% of initial PCE after 1800 hours of stability testing.
  • Demonstrated a promising deep eutectic strategy for PSC enhancement.

Conclusions:

  • The DpyDS-LiTFSI deep eutectic mixture offers a dual function for improving PSC performance and stability.
  • This approach effectively mitigates ion migration and enhances charge transport properties.
  • The developed strategy presents a viable pathway towards highly efficient and durable perovskite solar cells.