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Related Experiment Video

Updated: May 27, 2025

Flash Infrared Annealing for Perovskite Solar Cell Processing
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PTAA-Based Perovskite Photovoltaics Catching up: Ionic Liquid Engineering-Assisted Crystallization Through Sequential

Yongjun Li1,2, Fei Wang1,3, Qiannan Li1

  • 1Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic University, 7098 Liuxian Boulevard, Shenzhen, 518055, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 20, 2025
PubMed
Summary

Ionic liquid EMIMCOOH improves perovskite solar cells by enhancing film morphology and stability. This leads to higher power conversion efficiency and prolonged device lifetime.

Keywords:
PTAAcrystallinityionic liquidperovskite solar cellsp‐i‐n

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Renewable Energy

Background:

  • Poly(triarylamine) (PTAA) is a stable hole-transporting material, but PTAA-based devices show lower performance than those using oxides or self-assembled monolayers (SAMs).
  • Improving perovskite film quality is crucial for efficient and stable solar cell devices.

Purpose of the Study:

  • To enhance the performance and stability of perovskite solar cells by incorporating an ionic liquid into the precursor solution.
  • To investigate the effect of EMIMCOOH on the morphology and properties of lead iodide (PbI2) films and subsequent perovskite conversion.

Main Methods:

  • Introduction of 1-ethyl-3-methylimidazolium formate (EMIMCOOH) into the lead iodide (PbI2) precursor solution.
  • Characterization of the resulting PbI2 films and perovskite layers using techniques like conducting atomic force microscopy (c-AFM).

Main Results:

  • EMIMCOOH forms coordination bonds with Pb2+, creating a more mesoporous PbI2 film with improved pore structure.
  • The ionic liquid addition slows perovskite conversion, leading to larger perovskite domains, reduced trap density, and enhanced charge transport.
  • Achieved a power conversion efficiency (PCE) of 24.10% with a fill factor over 85%.

Conclusions:

  • EMIMCOOH incorporation significantly improves perovskite film quality and device performance.
  • The modified devices demonstrate enhanced stability, retaining 86% of their initial PCE after 1500 hours at 25°C in a nitrogen atmosphere.