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Self-Consistent Cation-Anion Integration Eliminates Passivation Crosstalk for Inverted Perovskite Solar Cells.

Zhen Guan1, Zejun Wei2, Xiangyu Sun1

  • 1Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications, Experimental Center of Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Angewandte Chemie (International Ed. in English)
|September 16, 2025
PubMed
Summary
This summary is machine-generated.

A new self-consistent cation-anion integrated passivation (SCAP) strategy using PDA(TFA)2 effectively addresses interfacial defects in wide-bandgap perovskite solar cells. This approach significantly boosts power conversion efficiency for both single-junction and tandem devices.

Keywords:
Hybrid passivatorPerovskite/silicon tandem solar cellPhase segregationWide‐bandgap perovskite solar cell

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Wide-bandgap (WBG) perovskite absorbers in tandem solar cells suffer from interfacial defects and energy-level misalignment.
  • Existing dual-cation passivators face limitations due to cation competition and modification conflicts.

Purpose of the Study:

  • To introduce a novel self-consistent cation-anion integrated passivation (SCAP) strategy to overcome limitations in WBG perovskite solar cells.
  • To design a multifunctional passivator, PDA(TFA)2, for simultaneous defect and field-effect passivation.

Main Methods:

  • Developed a SCAP strategy utilizing a multifunctional passivator, PDA(TFA)2, with bipolar trifluoroacetate (TFA) anions and 1,3-propanediamine (PDA) cations.
  • The TFA anion passivates halide vacancies and bridges the perovskite/C60 interface.
  • PDA cations induce surface dipoles and optimize band alignment.

Main Results:

  • Optimized 1.68 eV WBG perovskite solar cells achieved a 23.23% power conversion efficiency (PCE) and 1.27 V open-circuit voltage.
  • Monolithic perovskite/silicon tandem cells (0.945 cm2) reached a 32.33% PCE (31.47% stabilized) with a 1.992 V open-circuit voltage.

Conclusions:

  • The SCAP strategy effectively eliminates cation competition and enhances passivation.
  • This approach significantly advances the efficiency and stability of WBG perovskite photovoltaics.
  • The SCAP strategy holds promise for next-generation tandem solar cells.