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Related Experiment Video

Updated: Jul 6, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
08:12

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Published on: September 8, 2017

Sub-Diffraction Nanolithography of Halide Perovskite via Reversible All-Optical Crystallization-Decomposition.

Zhengfen Wan1,2, Xiao Huang1,2, Fangyi Zhang3

  • 1School of Artificial Intelligence Science and Technology, University of Shanghai for Science and Technology, Shanghai, China.

Advanced Materials (Deerfield Beach, Fla.)
|July 4, 2026
PubMed
Summary

Scientists developed a new method to pattern halide perovskite thin films using only light. This light-driven process allows for chemistry-free, sub-diffraction patterning and reversible control of material properties for advanced optoelectronics.

Keywords:
halide perovskitelaser direct writingphotodetectorreversible modulationsub‐diffraction nanolithography

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Patterning via Optical Saturable Transitions - Fabrication and Characterization
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Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

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Last Updated: Jul 6, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
08:12

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Published on: September 8, 2017

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Patterning via Optical Saturable Transitions - Fabrication and Characterization
08:19

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Halide perovskites possess excellent optoelectronic properties but suffer from chemical fragility, hindering high-resolution patterning and nanoscale integration.
  • Existing patterning methods often involve harsh chemicals, limiting their applicability for sensitive perovskite materials.

Purpose of the Study:

  • To develop a reversible, all-optical strategy for chemistry-free, sub-diffraction patterning of halide perovskite thin films.
  • To enable light-driven control over perovskite material states for reconfigurable optoelectronic devices.

Main Methods:

  • Utilized localized femtosecond laser excitation to induce crystallization and phase transitions in CsPbBr3 thin films.
  • Employed ultraviolet illumination to promote defect formation and partial decomposition, reversibly altering material properties.
  • Investigated the light-driven crystallization-decomposition dynamics and their impact on crystallinity and photocurrent.

Main Results:

  • Femtosecond laser excitation enhanced crystallinity and optoelectronic response through controlled crystallization and an orthorhombic-to-cubic phase transition.
  • UV illumination reversibly suppressed crystallinity and photocurrent by inducing defects and decomposition into CsBr and PbBr2.
  • Demonstrated a repeatable crystallization-decomposition cycle with over 85% photocurrent recovery, showcasing robust material-state control.
  • Achieved resist-free, sub-diffraction nanolithography with feature sizes as small as 93.5 nm.

Conclusions:

  • A novel light-programmable structural degree of freedom in halide perovskites was revealed.
  • The study establishes a general materials framework for reconfigurable perovskite architectures, adaptive photonics, and dynamic optoelectronic systems.
  • The all-optical, reversible patterning strategy overcomes limitations of chemical fragility and enables advanced nanoscale integration.