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CsPb₂ Br₅ Single Crystals: Synthesis and Characterization.

Ibrahim Dursun¹, Michele De Bastiani¹, Bekir Turedi¹

¹KAUST Solar Center, KSC), Division of Physical Sciences and Engineering, PSE), King Abdullah University of Science and Technology, KAUST), Thuwal, 23955-6900, Saudi Arabia.

|August 3, 2017

Summary

This study synthesized CsPb2Br5 bulk single crystals, clarifying its optical properties. The material has a 3.1 eV indirect band gap and no visible light emission, paving the way for optoelectronics.

Keywords:

halogen perovskites indirect band gap photoluminescence plumbates single crystal

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Area of Science:

Materials Science
Solid-State Physics
Optoelectronics

Background:

Cesium lead bromide (CsPb2Br5) is a ternary halogen-plumbate material with properties similar to halide perovskites.
Its unique two-dimensional structure suggests potential in optoelectronic applications.
Previous research on CsPb2Br5 nanostructures and powders yielded unclear and conflicting optical property data.

Purpose of the Study:

To synthesize and characterize CsPb2Br5 bulk single crystals.
To definitively determine the optical properties of CsPb2Br5.
To resolve discrepancies in existing literature regarding CsPb2Br5 optical characteristics.

Main Methods:

Synthesis of CsPb2Br5 bulk single crystals.
Characterization of the crystal structure and optical properties.
Band gap energy determination.

Main Results:

Successfully synthesized CsPb2Br5 bulk single crystals.
Confirmed a two-dimensional crystal structure with Pb2Br5- layers and Cs+ cations.
Determined an indirect band gap of approximately 3.1 eV.
Observed no emission in the visible spectrum.

Conclusions:

The study clarifies the optical features of CsPb2Br5 through bulk single crystal analysis.
CsPb2Br5 possesses a significant indirect band gap, making it unsuitable for visible light emission applications.
This work provides a foundational understanding for future research and development of CsPb2Br5 in optoelectronics.