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Different photocurrent response of Cs₄PbBr₆ particles.

Lei Pu¹, Yarong Gu¹, Qian Meng²

¹Materials Genome Institute, Shanghai University, Shanghai 200444, People's Republic of China.

The Journal of Chemical Physics

|June 22, 2022

Summary

The study investigated the controversial green emission in cesium lead halide perovskites (Cs4PbBr6). A negative photocurrent response in green-emissive Cs4PbBr6 suggests charged excitons, possibly from bromine vacancies, cause the emission.

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Area of Science:

Materials Science
Solid-State Physics
Photophysics

Background:

Zero-dimensional (0D) all-inorganic cesium lead halide perovskites, especially Cs4PbBr6, are noted for their optical properties and stability.
The origin of green emission in Cs4PbBr6, despite its ultraviolet B (UVB) bandgap, remains a subject of debate.
Photocurrent response is a valuable technique for understanding photo-excited carrier dynamics in materials.

Purpose of the Study:

To investigate the origin of green emission in Cs4PbBr6 by analyzing photocurrent responses.
To differentiate between Cs4PbBr6 samples with and without visible green emission.
To correlate material properties with observed optical phenomena.

Main Methods:

Synthesis of Cs4PbBr6 particles exhibiting no visible emission and those with green emission.
Measurement and analysis of photocurrent responses for both types of Cs4PbBr6 samples.
Theoretical calculations to explore lattice defects and exciton behavior.

Main Results:

Cs4PbBr6 without visible emission displayed a positive photocurrent response.
Cs4PbBr6 with green emission exhibited a negative photocurrent response.
Calculations indicated a higher propensity for bromine vacancies in green-emissive Cs4PbBr6, potentially forming charged excitons.

Conclusions:

The negative photocurrent response in green-emissive Cs4PbBr6 is attributed to a built-in electric field generated by charged excitons.
Bromine vacancies in the Cs4PbBr6 lattice are proposed as a mechanism for forming these charged excitons.
This research offers insights into the controversial origin of green emission in Cs4PbBr6.