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Updated: Aug 3, 2025

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Ionic Ir(III) complex-interfacial layer for efficient carrier collection via induced electric dipole.

Minsoo Lee1,2, Hyun-Tak Kim1,2,3, Ji Hoon Seo4,5

  • 1Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea. kwon90@unist.ac.kr.

Physical Chemistry Chemical Physics : PCCP
|April 11, 2023
PubMed
Summary

Ionic iridium(III) complexes enhance polymer solar cell efficiency and stability. These interfacial layers improve charge collection and UV durability, boosting power conversion efficiency and device longevity.

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Organic Electronics

Background:

  • Polymer solar cells (PSCs) achieve high power conversion efficiency (PCE) >19% via non-fullerene acceptors.
  • Interfacial layers (ILs) are crucial for optimizing charge extraction in PSCs.
  • Developing advanced ILs is key to further improving PSC performance and stability.

Purpose of the Study:

  • To introduce novel ionic iridium(III) (Ir(III)) complexes as interfacial layers in PSCs.
  • To investigate the role of alkali metal cations (Li+, Na+, K+) in Ir(III) complexes for enhancing charge collection.
  • To evaluate the impact of these ILs on PSC power conversion efficiency (PCE) and operational stability.

Main Methods:

  • Synthesis of ionic Ir(III) complexes with varying alkali metal cations.
  • Fabrication of PSCs utilizing these Ir(III) complexes as interfacial layers.
  • Characterization of device performance using techniques including PCE measurements and electrochemical impedance spectroscopy.
  • Assessment of device stability under UV light and AM 1.5 G irradiation.

Main Results:

  • Ionic Ir(III) complexes, particularly Ir-K+, improved PCE from 14.0% to 15.6% in PM6:Y6-based PSCs.
  • The complexes enhance internal electric fields, improving charge collection efficiency.
  • PSCs with Ir(III) ILs exhibited significantly improved stability, retaining ~60% PCE after UV exposure compared to ~20% for control devices.

Conclusions:

  • Ionic Ir(III) complexes effectively function as interfacial layers, boosting PSC performance.
  • The induced internal electric field and enhanced charge collection contribute to higher PCE.
  • The inherent UV absorption and photo-durability of Ir(III) complexes significantly improve PSC operational stability.