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Simultaneous Microstructure Visualization and Trap State Discrimination in Perovskite Films Via Time-Gated

Zhanrong Yang¹, Jingyi Zhu¹, Shunli Liu¹

¹Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education, and School of Physics and Technology, Wuhan University, Wuhan, Hubei 430072, China.

The Journal of Physical Chemistry Letters

|May 26, 2026

Summary

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Researchers developed a new microscopy technique to visualize hybrid perovskite microstructures and identify trap states. This method reveals "dynamic boundaries" and aids in optimizing perovskite optoelectronics.

Area of Science:

Materials Science
Optoelectronics
Spectroscopy

Background:

Hybrid perovskites exhibit excellent performance due to long-range carrier transport and defect tolerance.
Polycrystalline nature of hybrid perovskites causes microstructural heterogeneity, affecting trap-state distributions and carrier dynamics.

Purpose of the Study:

To develop a time-gated fluorescence lifetime imaging microscopy (FLIM) strategy for simultaneous microstructure visualization and trap state discrimination.
To correlate microstructure with trap energetics in hybrid perovskites.

Main Methods:

Utilized time-gated FLIM on a single photoluminescence decay dataset.
Separated decay processes into fast decay, transition, and trap-dominated stages using time gates.
Applied log-log analysis to identify power-law decay characteristics.

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Main Results:

The fast decay stage visualizes microstructures by suppressing trap-assisted decay.
Subsequent stages reveal "dynamic boundaries" with enhanced emission.
Identified shallow-trap-dominated regions through power-law decay analysis.

Conclusions:

The developed noninvasive approach links microstructure to trap energetics.
Provides critical insights for optimizing passivation engineering in perovskite optoelectronics.
Enables simultaneous microstructure and trap state analysis from a single dataset.