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Transferrable CsPbBr3 Perovskite Single-Crystalline Films for Visible-Wavelength Photodetectors
Zhaozhong Tan1, Uijin Jung1, Seongmin Jeong1
1Department of Electronic Engineering, Hanyang University, Seoul 04763, Korea.
ACS Applied Materials & Interfaces
|August 13, 2024
Summary
Large-scale cesium lead bromide (CsPbBr3) single-crystalline films were grown for optoelectronic devices. These high-quality films enable efficient visible photodetectors with low dark current and high performance.
Area of Science:
- Materials Science
- Optoelectronics
- Crystallography
Background:
- Perovskite materials offer promising optoelectronic properties.
- Challenges exist in fabricating high-quality, large-scale perovskite films.
Purpose of the Study:
- To develop a method for growing large-scale CsPbBr3 single-crystalline films (SCFs).
- To apply these SCFs in high-performance optoelectronic devices, specifically visible photodetectors.
Main Methods:
- One-step vapor-phase epitaxy (VPE) for CsPbBr3 SCF growth.
- Optimization of precursor transport and cooling rates.
- Transfer-assembly strategy for fabricating heterostructures.
Main Results:
- Continuous CPB films exceeding 2 cm2 with controlled thickness were obtained.
- Excellent crystallinity and very low trap density (2.14 × 1011) were confirmed.
- A self-biased photodetector exhibited high responsivity (1.9 A/W), detectivity (4.65 × 1012 Jones), and on/off ratio (4.63 × 103).
Conclusions:
- The VPE method is effective for producing large-scale CsPbBr3 SCFs.
- High-quality SCFs enable efficient and low-dark-current photodetectors.
- The transfer-assembly method provides a universal approach for perovskite optoelectronic device integration.
