Ultrastable and high-performance amplified spontaneous emission in centimeter-scale inorganic CsPbBr3 single-crystal thin films.
- Resource Type
- Article
- Authors
- Cao, Yuehan; Xu, Caixia; Zhang, Yunhui; Song, Tianwei; Liao, Lulu; Ran, Zihui; He, Yanwei; Xiao, Zhengguo; Xu, Long
- Source
- Applied Physics Letters. 1/22/2024, Vol. 124 Issue 4, p1-8. 8p.
- Subject
- *THIN films
*CHEMICAL vapor deposition
*CRYSTAL grain boundaries
*SOLAR cells
- Language
- ISSN
- 0003-6951
In this work, high-quality and centimeter-scale CsPbBr3 perovskite single-crystal thin films were grown using the metal-organic chemical vapor deposition method. Extremely flat surfaces without distinct grain boundaries were observed throughout the thin films. A high polarized degree of approximately 0.52 was measured from the single-crystal thin films by analyzing the polarization of the photoluminescence emission spectra. Low threshold amplified spontaneous emissions with an optical gain coefficient of 1215 cm−1 under the excitation energy of 301 μJ/cm2 and the highest value of 2857 cm−1 under the excitation energy of 1.08 mJ/cm2 were investigated under the excitation of a nanosecond laser at 266 nm. The CsPbBr3 single-crystal thin films showed excellent stability where the optical gain coefficient could be maintained over 1800 cm−1 after exposure to air for ten months. The results of this study not only provide high-quality single-crystal films for laser applications but also put forward a feasible scheme to improve the stability of the materials. [ABSTRACT FROM AUTHOR]