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Polarization-Sensitive Light Sensors Based on a Bulk Perovskite MAPbBr3 Single Crystal
Yuan Wang1, Laipan Zhu2, Cuifeng Du1
1School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Materials (Basel, Switzerland)
|April 3, 2021
Summary
Researchers studied methylammonium lead bromide perovskite single crystals, revealing abnormal bandgap temperature dependence and significant polarization sensitivity. These findings highlight potential for advanced optoelectronic and spintronic devices.
Area of Science:
- Materials Science
- Solid-State Physics
- Optoelectronics
Background:
- Organic-inorganic halide perovskites exhibit exceptional optoelectronic properties.
- Methylammonium lead bromide (MAPbBr3) is a promising perovskite material.
Purpose of the Study:
- To investigate the temperature and light polarization dependence of a bulk MAPbBr3 single crystal.
- To understand the underlying mechanisms of its optoelectronic behavior.
Main Methods:
- Fabrication of a bulk MAPbBr3 single crystal.
- Photoluminescence measurements across varying temperatures (room temperature to 78 K).
- Analysis of light absorption and polarization dependence.
Main Results:
- Observed band tail states upon cooling to 78 K.
- Abnormal temperature dependence of the bandgap attributed to tail state instability.
- Anisotropic light absorption (ratio 1.45) and circular dichroism (ratio 9%) due to spin-orbit coupling in band tail states.
- Demonstrated polarization sensitivity of the MAPbBr3 single crystal.
Conclusions:
- The study reveals unique optoelectronic characteristics of MAPbBr3 single crystals.
- Findings suggest potential for MAPbBr3 in polarization-sensitive optoelectronic and spintronic applications.
- Highlights the importance of understanding band tail states for device development.
