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Related Experiment Video

Updated: May 23, 2025

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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Regulating Crystallization for Pure-Iodide 1.68 eV Bandgap Perovskite Solar Cells with a Fill Factor over 86.

Xiangqing Zhou1,2,3,4,5, Xingliang Li1,2,3,4,5, Biao Shi1,2,3,4,5

  • 1Institute of Photoelectronic Thin Film Devices and Technology, Renewable Energy Conversion and Storage Center, State Key Laboratory of Photovoltaic Materials and Cells, Nankai University, Tianjin 300350, P. R. China.

ACS Nano
|March 11, 2025
PubMed
Summary

Pure-iodide wide-bandgap perovskite solar cells overcome phase segregation issues using lead thiocyanate and oleylamine hydrochloride additives. This innovation enhances crystallization and stability, achieving high efficiency for tandem solar cells.

Keywords:
crystallization regulationhomogeneous phaseperovskite solar cellsphotostabilitypure-Iodide perovskites

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Solid-State Chemistry

Background:

  • Mixed halide wide-bandgap (WBG) perovskites are crucial for tandem solar cells but suffer from photoinduced halide phase segregation.
  • Pure-iodide WBG perovskites offer a potential solution by widening the bandgap through increased Cesium (Cs) content, avoiding Bromine (Br).
  • Existing pure-iodide WBG perovskite solar cells (PSCs) show lower efficiency due to poor crystallization and high defect densities from complex phase transitions.

Purpose of the Study:

  • To address the efficiency limitations of pure-iodide WBG PSCs by improving crystallization and reducing defects.
  • To achieve enhanced stability and performance in WBG PSCs by preventing halide phase segregation.

Main Methods:

  • Incorporation of lead thiocyanate (Pb(SCN)2) and oleylamine hydrochloride (OAmCl) into the Cs0.3DMA0.2MA0.5PbI3 precursor solution.
  • Utilizing additives to promote homogeneous phase distribution and control nucleation and phase transition processes.
  • Characterization of film quality, defect density, surface electronic properties, and photovoltaic performance.

Main Results:

  • Achieved homogeneous phase distribution in pure-iodide WBG perovskite films, leading to enhanced crystallization.
  • Reduced excess lead source defects and improved film quality with fewer surface-bulk defects.
  • Demonstrated a high power conversion efficiency (PCE) of 21.55% with an exceptionally high fill factor of 86.03%.

Conclusions:

  • The combined use of Pb(SCN)2 and OAmCl effectively suppresses phase segregation in pure-iodide WBG perovskites.
  • The developed PSCs exhibit superior photostability, remaining phase segregation-free under continuous illumination for 12 hours.
  • This approach significantly advances the viability of pure-iodide WBG perovskites for high-efficiency and stable tandem solar cell applications.