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

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Self-trapped excitons in two-dimensional perovskites.

Junze Li¹, Haizhen Wang², Dehui Li^3,4

¹School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China.

Frontiers of Optoelectronics

|January 15, 2023

Summary

Self-trapped excitons form easily in 2D perovskites due to low energy barriers, influencing their optoelectronic properties. This study reviews their characteristics and applications.

Keywords:

broadband emission electron-phonon coupling optoelectronic applications self-trapped exciton (STE)two-dimensional (2D) perovskites

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Area of Science:

Materials Science
Condensed Matter Physics
Optoelectronics

Background:

Strong electron-phonon coupling often leads to self-trapped excitons (STEs) with local lattice distortion.
Material dimensionality significantly impacts STE formation barriers; 2D systems have lower or no barriers, facilitating STE formation.
STEs exhibit broadband emission with large Stokes shifts, influencing material properties.

Purpose of the Study:

To summarize the luminescence characteristics, origins, and characterization of self-trapped excitons in two-dimensional (2D) perovskites.
To explore the influence of STEs on the optical and electrical properties of 2D perovskites.
To introduce the optoelectronic applications of STEs in 2D perovskites.

Main Methods:

Review of existing literature on self-trapped excitons in 2D perovskites.
Analysis of luminescence properties, including emission spectra and Stokes shifts.
Characterization techniques relevant to STEs in layered materials.

Main Results:

Self-trapped excitons are readily formed in 2D perovskites due to their soft lattice characteristics and strong electron-phonon interactions.
STE formation in 2D perovskites is favored due to marginal potential barriers, unlike 3D materials.
STE emission in 2D perovskites shows broadband characteristics and significant Stokes shifts.

Conclusions:

Self-trapped excitons play a crucial role in the unique optical and electrical behavior of 2D perovskites.
Understanding STE properties is key to harnessing 2D perovskites for advanced optoelectronic devices.
Further research into STE phenomena can unlock novel applications in areas like LEDs and solar cells.