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Highly In-Plane Polarization-Sensitive Photodetection in CsPbBr3 Single Crystal
Kaiyu Wang1, Lin Jing1, Qing Yao1
1College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
The Journal of Physical Chemistry Letters
|February 16, 2021
Summary
Fully inorganic cesium lead bromide (CsPbBr3) single crystals offer superior stability for photodetectors. These CsPbBr3 photodetectors demonstrate excellent polarized light response and anisotropic optoelectronic properties.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Physics
Background:
- Fully inorganic perovskite cesium lead bromide single crystal (CsPbBr3 SC) is a promising semiconductor for photodetectors.
- It exhibits superior humidity, thermal, and light stability compared to organic-inorganic hybrid perovskites.
- CsPbBr3 SC possesses a large light absorption coefficient and ultralong carrier migration distance.
Purpose of the Study:
- To grow large-sized CsPbBr3 SCs using inverse temperature solubility in ternary solvents.
- To fabricate and characterize CsPbBr3 SC-based photodetectors with a focus on polarized light response.
- To investigate the anisotropic optoelectronic properties of these photodetectors.
Main Methods:
- Utilized inverse temperature solubility in ternary solvents for crystal growth.
- Fabricated photodetectors using the (101) plane of CsPbBr3 SC.
- Measured photocurrent response as a function of polarization angle.
- Performed first-principles calculations for theoretical validation.
Main Results:
- Successfully grew large-sized CsPbBr3 SCs.
- Fabricated photodetectors exhibited excellent polarized light response.
- Photocurrent showed a sinusoidal dependence on the polarization angle, indicating strong anisotropy.
- Photodetection performance perpendicular to the y-axis was significantly higher than parallel to it.
- Achieved a dichroic ratio of 2.65 under 405 nm illumination at 1 V bias.
- Experimental results aligned with theoretical calculations.
Conclusions:
- CsPbBr3 SCs are suitable for high-performance photodetector applications.
- The anisotropic optoelectronic properties enable effective polarized light detection.
- The developed growth and fabrication methods are promising for future optoelectronic devices.
