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Related Experiment Video

Updated: Jun 13, 2025

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High-Performance Inverted Organic Solar Cells with MXene-Based Interfacial Engineering.

Tao Li1, Guoying Yao2, Jianbin Wang1

  • 1Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, School of Material Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China.

ACS Applied Materials & Interfaces
|May 29, 2025
PubMed
Summary

A new MXene interlayer (Ti3C2OHx) boosts inverted organic solar cells (OSCs) efficiency and stability by optimizing interfaces. This advance addresses key limitations in nonfullerene acceptor solar devices.

Keywords:
ZnO, MXeneelectron transport layernonfullerene acceptorsorganic solar cells

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Renewable Energy

Background:

  • Inverted organic solar cells (OSCs) exhibit enhanced operational stability but suffer from lower power conversion efficiencies (PCE) compared to conventional devices.
  • A primary limitation is the electron affinity downshift in nonfullerene acceptors, impeding efficient charge extraction.
  • Defects on the ZnO surface also contribute to performance limitations in OSCs.

Purpose of the Study:

  • To introduce a MXene interlayer (Ti3C2OHx) for interfacial engineering in inverted OSCs.
  • To simultaneously optimize the ZnO/active layer energetic landscape and passivate ZnO surface defects.
  • To enhance the power conversion efficiency (PCE) and operational stability of inverted OSCs.

Main Methods:

  • Incorporation of a Ti3C2OHx MXene interlayer at the ZnO/active layer interface.
  • Characterization of the modified interface to assess energetic landscape optimization and defect passivation.
  • Fabrication and testing of inverted OSC devices with the MXene interlayer to evaluate performance metrics.

Main Results:

  • The MXene interlayer successfully optimized the energetic landscape and passivated ZnO surface defects.
  • Modified ZnO interfaces reduced energy barriers and mitigated nonradiative recombination, enhancing charge extraction.
  • Achieved a remarkable PCE of 18.55%, alongside improved storage and photostability in inverted OSCs.

Conclusions:

  • MXene (Ti3C2OHx) serves as a versatile material for effective interfacial engineering in high-efficiency inverted OSCs.
  • This strategy significantly overcomes the efficiency limitations associated with nonfullerene acceptors in inverted OSC architectures.
  • The findings pave the way for developing more stable and efficient organic solar cell technologies.