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Polymer-linked growth wafer-sized Ruddlesden-Popper perovskite single-crystal films.

Sihan Zhang1, Hengyu Cao1, Chen Wang1,2

  • 1School of Energy, School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215000, People's Republic of China.

Nanotechnology
|July 7, 2025
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Summary

Researchers developed a polymer-linked strategy for wafer-sized growth of high-quality two-dimensional Ruddlesden-Popper perovskite single-crystal thin films (SCTFs). This method controls nucleation and anisotropic growth, enabling large-scale optoelectronic device fabrication.

Keywords:
Ruddlesden–Popper perovskitecoordination interactionsingle-crystal thin filmswafer-sized

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Optoelectronics

Background:

  • Wafer-sized two-dimensional Ruddlesden-Popper perovskite single-crystal thin films (SCTFs) are crucial for large-scale optoelectronic devices.
  • Challenges in controlling nucleation and anisotropic growth hinder wafer-scale fabrication of these films.

Purpose of the Study:

  • To develop a novel strategy for the wafer-sized growth of high-quality perovskite single-crystal thin films.
  • To overcome the limitations of rapid nucleation and high nucleation density in perovskite film growth.

Main Methods:

  • A polymer-linked assistance strategy was designed using polymers with oxygen functional groups.
  • Coordination interactions between polymers and lead ions were utilized to enhance solution stability and control nucleation.
  • Polymer adsorption onto inorganic layers was employed to suppress vertical growth and promote lateral orientation.

Main Results:

  • Wafer-sized BA2PbBr4 SCTFs with a lateral dimension of 50.0 mm and thickness of 470.8 nm were successfully grown.
  • The strategy reduced nucleation density and increased nucleation size, leading to high-quality films with a high aspect ratio (>105).
  • Defect suppression was achieved through coordination interactions, enhancing film quality.

Conclusions:

  • The polymer-linked assistance strategy provides a feasible method for wafer-sized growth of high-quality halide perovskite SCTFs.
  • This advancement paves the way for the practical implementation of perovskite SCTFs in next-generation optoelectronic devices.