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Related Experiment Video

Updated: Jul 18, 2025

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
11:38

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Multifunctional Self-Assembled Ionic Liquid Modified Rigid and Flexible Substrates for Efficient Simple-Structured

Shuai Huang1, Guifang Dong2, Liangliang Zhu1

  • 1Key Laboratory of Optoelectronics Technology Ministry of Education, College of Electronic Science and Technology, Beijing University of Technology, Beijing, 100124, P. R. China.

Chemsuschem
|August 25, 2023
PubMed
Summary

Ionic liquid modification of electrodes enhances electron transport layer-free perovskite solar cells (PSCs). This approach improves performance and stability for commercialization.

Keywords:
perovskite photovoltaic. [HOEtMIM]Cl. energy level alignment. non-radiative recombination. charge extraction

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Electron transport layer (ETL)-free perovskite solar cells (PSCs) face challenges with slow electron extraction and recombination at the FTO/perovskite interface.
  • Optimizing the energy-level alignment at the bottom electrode/perovskite interface is critical for improving PSC performance.

Purpose of the Study:

  • To investigate the use of 1-hydroxyethyl-3-methylimidazolium chloride ([HOEtMIM]Cl) ionic liquid for modifying electrode surfaces in ETL-free PSCs.
  • To enhance electron extraction, reduce carrier recombination, and improve the overall performance and stability of PSCs.

Main Methods:

  • Surface modification of rigid and flexible electrodes using [HOEtMIM]Cl ionic liquid.
  • Fabrication of ETL-free PSCs utilizing the modified electrodes.
  • Characterization of interfacial properties, device performance, and stability.

Main Results:

  • The [HOEtMIM]Cl modification created an energetically well-aligned FTO/perovskite interface via electric dipole effects, enabling barrier-free charge transfer.
  • Electron extraction and collection were significantly improved, while nonradiative interfacial carrier recombination was mitigated.
  • Perovskite surface defects were passivated by the imidazole group, and crystallinity was enhanced by the chloride anion.
  • ETL-free rigid PSCs achieved a power conversion efficiency (PCE) of 19.60%, and flexible PSCs reached 15.57% PCE, with improved hysteresis and long-term stability.

Conclusions:

  • Engineered [HOEtMIM]Cl modification effectively addresses interfacial issues in ETL-free PSCs, leading to high performance and stability.
  • This strategy holds significant potential for the scaled-up manufacturing of efficient and durable ETL-free PSCs.