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Related Experiment Video

Updated: May 22, 2026

In Situ Monitoring of the Accelerated Performance Degradation of Solar Cells and Modules: A Case Study for Cu(In,Ga)Se2 Solar Cells
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Multisite Molecular Coordination for Defect and Structural Regulation in Carbon-Cathode Hole-Transport-Layer-Free

Xueyan Ma1, Hai Liu1, Jiaxiu Feng1

  • 1LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, Lanzhou, Gansu, China.

Small (Weinheim an Der Bergstrasse, Germany)
|May 21, 2026
PubMed
Summary

A new molecular strategy using terpyridine derivatives enhances CsPbI2Br solar cells by reducing defects. This leads to improved efficiency and stability in hole-transport-layer-free (HTL-free) devices.

Keywords:
carbon‐cathode HTL‐free CsPbI2Br solar cellsdefect passivationinterfacial charge transportmultisite molecular coordinationoperational stability

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Nanotechnology

Background:

  • Carbon-cathode hole-transport-layer-free (HTL-free) CsPbI2Br solar cells show promise for cost-effective photovoltaics.
  • Defect-related losses significantly limit the performance of these solar cells.

Purpose of the Study:

  • To develop a molecular strategy for defect regulation in CsPbI2Br films.
  • To improve the performance and stability of HTL-free CsPbI2Br solar cells.

Main Methods:

  • A molecular strategy based on terpyridine derivatives was employed.
  • The strategy involved regulating defect states, lattice distortion, and interfacial charge-transfer energetics.
  • Coordination between terpyridine derivatives and undercoordinated metal ions/vacancy defects was utilized.

Main Results:

  • Improved CsPbI2Br film crystallinity and reduced electronic non-uniformity.
  • More efficient interfacial charge extraction and enhanced device performance.
  • Achieved a power conversion efficiency of 16.02% with minimal hysteresis and improved operational stability.

Conclusions:

  • The molecular strategy effectively regulates defects in CsPbI2Br films.
  • This approach offers a general strategy for defect management in related optoelectronic devices, including MAPbI3-based cells.