Scanning the optical characteristics of lead-free cesium titanium bromide double perovskite nanocrystals

doi:10.1088/1674-1056/ac5984

中国物理B ›› 2022, Vol. 31 ›› Issue (5): 54218-054218.doi: 10.1088/1674-1056/ac5984

Scanning the optical characteristics of lead-free cesium titanium bromide double perovskite nanocrystals

Chenxi Yu(于晨曦), Long Gao(高龙), Wentong Li(李文彤), Qian Wang(王倩),Meng Wang(王萌), and Jiaqi Zhang(张佳旗)

Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun 130012, China

收稿日期:2021-12-28 修回日期:2022-02-14 出版日期:2022-05-14 发布日期:2022-04-29
通讯作者: Jiaqi Zhang,E-mail:zhangjiaqi@jlu.edu.cn E-mail:zhangjiaqi@jlu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No.61804063) and the Natural Science Foundation of Jilin Province,China (Grant No.20190201208JC).

Scanning the optical characteristics of lead-free cesium titanium bromide double perovskite nanocrystals

Chenxi Yu(于晨曦), Long Gao(高龙), Wentong Li(李文彤), Qian Wang(王倩),Meng Wang(王萌), and Jiaqi Zhang(张佳旗)^†

Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun 130012, China

Received:2021-12-28 Revised:2022-02-14 Online:2022-05-14 Published:2022-04-29
Contact: Jiaqi Zhang,E-mail:zhangjiaqi@jlu.edu.cn E-mail:zhangjiaqi@jlu.edu.cn
About author:2022-3-2
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No.61804063) and the Natural Science Foundation of Jilin Province,China (Grant No.20190201208JC).

1. 2022-054218-SI.pdf(265KB)

摘要/Abstract

摘要： Cs₂TiBr₆ nanocrystals (NCs) are a type of promising optoelectronic materials, owing to their high photoelectric properties and non-toxicity. Here, we synthesize the colloidal Cs₂TiBr₆ NCs using a hot-injection approach. The temperature-dependent absorption data shows that its energy band changes about 30 meV with temperature, reflecting that its energy band structure is much stable. The excitation intensity-dependent transient absorption data confirms its linear absorption cross-sections and carrier recombination rate constants, involving monomolecular and bimolecular recombination, which are all superior to those of conventional perovskite bromide counterparts. In addition, its nonlinear absorption cross-sections are also measured based on femtosecond Z-scan. Our results suggest that Cs₂TiBr₆ NCs can be extensively applied in the field of optoelectronics, owing to its excellent carrier dynamics and nonlinear optical properties.

关键词: Cs₂TiBr₆, nonlinear optics, ultrafast spectroscopy, absorption spectra

Abstract: Cs₂TiBr₆ nanocrystals (NCs) are a type of promising optoelectronic materials, owing to their high photoelectric properties and non-toxicity. Here, we synthesize the colloidal Cs₂TiBr₆ NCs using a hot-injection approach. The temperature-dependent absorption data shows that its energy band changes about 30 meV with temperature, reflecting that its energy band structure is much stable. The excitation intensity-dependent transient absorption data confirms its linear absorption cross-sections and carrier recombination rate constants, involving monomolecular and bimolecular recombination, which are all superior to those of conventional perovskite bromide counterparts. In addition, its nonlinear absorption cross-sections are also measured based on femtosecond Z-scan. Our results suggest that Cs₂TiBr₆ NCs can be extensively applied in the field of optoelectronics, owing to its excellent carrier dynamics and nonlinear optical properties.

Key words: Cs₂TiBr₆, nonlinear optics, ultrafast spectroscopy, absorption spectra

中图分类号: (Nonlinear optics)

42.65.-k

78.47.J- (Ultrafast spectroscopy (<1 psec)) 78.40.Fy (Semiconductors)

Chenxi Yu(于晨曦), Long Gao(高龙), Wentong Li(李文彤), Qian Wang(王倩), Meng Wang(王萌), and Jiaqi Zhang(张佳旗). Scanning the optical characteristics of lead-free cesium titanium bromide double perovskite nanocrystals[J]. 中国物理B, 2022, 31(5): 54218-054218.

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Scanning the optical characteristics of lead-free cesium titanium bromide double perovskite nanocrystals

Scanning the optical characteristics of lead-free cesium titanium bromide double perovskite nanocrystals

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