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Updated: Sep 5, 2025

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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High-conductivity thiocyanate ionic liquid interface engineering for efficient and stable perovskite solar cells.

Shumao Wang1,2, Haodan Guo2,3, Jinpeng Wu2,3

  • 1College of New Materials and Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing, 102617, China. daiyuhua@bipt.edu.cn.

Chemical Communications (Cambridge, England)
|July 6, 2022
PubMed
Summary

A novel ionic liquid, ethylmethylimidazolium thiocyanate (EMIMSCN), enhances perovskite solar cell performance by passivating defects. This strategy boosts power conversion efficiency and stability in solar devices.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Perovskite solar cells (PSCs) are promising for next-generation photovoltaics.
  • Defect passivation is crucial for improving PSC efficiency and stability.
  • Ionic liquids offer potential as functional additives in PSCs.

Purpose of the Study:

  • To investigate the use of a high-conductivity thiocyanate ionic liquid, ethylmethylimidazolium thiocyanate (EMIMSCN), as a passivation agent in PSCs.
  • To evaluate the impact of EMIMSCN on defect passivation and interfacial energy levels.
  • To assess the resulting improvements in PSC performance and stability.

Main Methods:

  • Introduction of EMIMSCN into perovskite solar cells.
  • Characterization of defect passivation (I vacancy and Pb-I antisite defects).
  • Analysis of interfacial energy level optimization.
  • Performance testing (Power Conversion Efficiency - PCE) and stability assessment.

Main Results:

  • EMIMSCN effectively passivates I vacancy and Pb-I antisite defects.
  • Optimized interfacial energy levels were achieved.
  • PSC devices treated with EMIMSCN demonstrated a high PCE of 22.55%.
  • Substantial enhancement in device stability was observed.

Conclusions:

  • EMIMSCN serves as an effective multifunctional passivation agent for PSCs.
  • The high conductivity of EMIMSCN facilitates defect passivation and energy level optimization.
  • This approach offers a simple and efficient strategy for developing high-performance and stable PSCs.