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Co-Assembled Layers for High Performance Wide Bandgap Inverted Perovskite Solar Cells.

Renlong Hao1,2, Guangyue Yang2, Xiaopeng Feng2

  • 1Shandong Energy Group Co., Ltd., Jinan, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|January 29, 2026
PubMed
Summary
This summary is machine-generated.

Aminoguanidine dihydrochloride enhances wide-bandgap perovskite solar cells by forming a co-assembled layer (AH-SAM). This strategy improves voltage, efficiency, and operational stability for tandem photovoltaics.

Keywords:
energy level alignmentinterface passivationperovskite solar cellsself‐assembled monolayerswide‐bandgap perovskite

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Wide-bandgap perovskite solar cells are crucial for tandem photovoltaics but suffer from interfacial voltage losses and degradation.
  • Existing hole-transport layers (HTLs) like Me-4PACz face limitations in performance and stability.

Purpose of the Study:

  • To improve the performance and stability of wide-bandgap perovskite solar cells.
  • To address interfacial voltage losses and light-induced degradation in perovskite devices.

Main Methods:

  • Incorporation of aminoguanidine dihydrochloride into Me-4PACz to form a co-assembled layer (AH-SAM).
  • Investigating cation-π coupling and electrostatic interactions within the AH-SAM.
  • Characterizing changes in the highest occupied molecular orbital (HOMO) level and UV resistance of the HTL.
  • Evaluating passivation of halide vacancies and suppression of Me-4PACz aggregation.

Main Results:

  • AH-SAM lowered the HTL's HOMO level and enhanced UV resistance.
  • Achieved an open-circuit voltage of 1.27 V with a low voltage deficit of 0.40 V for a 1.67 eV perovskite device.
  • Attained a power conversion efficiency of 22.97%.
  • Demonstrated enhanced operational stability, retaining 96% efficiency after 1,000 hours of testing.

Conclusions:

  • The AH-SAM strategy effectively improves energy level alignment and interface passivation in perovskite solar cells.
  • This approach significantly boosts both the efficiency and long-term stability of wide-bandgap perovskite devices.
  • The findings highlight the potential of co-assembled layers for advancing perovskite solar cell technology.