Influence of Shell Thickness on the Photophysical Properties of Core-Shell Perovskite Nanocrystals

Zhang, Xuanyu1; Zhang, Chengxi2,4; Chen, Baian1; Li, Junzi3; Wang, Zhaojin1; Wang, Kai1; He, Tingchao3; Yang, Xuyong2; Chen, Rui1

2023-10-01

10.1002/adom.202301782

ADVANCED OPTICAL MATERIALS   Impact Factor & Quartile

2195-1071

Core-shell perovskite nanocrystals (NCs) have emerged as a promising class of materials for optoelectronic applications due to their unique properties and stability. Although much research has been conducted on the shell growth mechanism and properties of the core-shell NCs, little is known about the role of shell thickness in determining their optical properties. Herein, a heteroepitaxial method is employed to prepare a series of core-shell FAPbBr(3)/CsPbBr3 NCs with different shell thicknesses. Through temperature-dependent photoluminescence measurement, it is found that the electronic structure of core-shell FAPbBr(3)/CsPbBr3 NCs evolves from quasi-type-II to type-I with the increase in shell thickness. This abnormal transition can be attributed to the thickened gradient alloy layer FA(1-x)Cs(x)PbBr(3), which effectively relieves the lattice mismatch and releases strain in the NCs, resulting in variations in the bandgap between the core and the shell. Furthermore, the biexciton Auger lifetimes in these samples exhibit a non-monotonic dependence on shell thickness, indicating the electronic structure transition. These results provide valuable insights into the relationship between shell thickness, electronic structure, and optical properties in core-shell perovskite NCs, which may offer guidance for the design of high-performance optoelectronic devices.

biexciton Auger recombination core-shell perovskite nanocrystals electronic structure laser spectroscopy shell thickness

SCI

English

First ; Corresponding

This work was supported by the National Natural Science Foundation of China (62174079) and the Science, Technology and Innovation Commission of Shenzhen Municipality (Projects Nos. JCYJ20220530113015035, JCYJ20210324120204011, and KQTD2015071710313656).[62174079] ; National Natural Science Foundation of China["JCYJ20220530113015035","JCYJ20210324120204011","KQTD2015071710313656"]

Materials Science ; Optics

Materials Science, Multidisciplinary ; Optics

WOS:001086377300001

WILEY-V C H VERLAG GMBH

Web of Science

1.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
2.Shanghai Univ, Minist Educ, Key Lab Adv Display & Syst Applicat, Shanghai 200072, Peoples R China
3.Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Peoples R China
4.Jiangsu Univ Sci & Technol, Sch Sci, Dept Optoelect Informat Sci & Engn, Zhenjiang 212100, Jiangsu, Peoples R China

Zhang, Xuanyu,Zhang, Chengxi,Chen, Baian,et al. Influence of Shell Thickness on the Photophysical Properties of Core-Shell Perovskite Nanocrystals[J]. ADVANCED OPTICAL MATERIALS,2023.

Zhang, Xuanyu.,Zhang, Chengxi.,Chen, Baian.,Li, Junzi.,Wang, Zhaojin.,...&Chen, Rui.(2023).Influence of Shell Thickness on the Photophysical Properties of Core-Shell Perovskite Nanocrystals.ADVANCED OPTICAL MATERIALS.

Zhang, Xuanyu,et al."Influence of Shell Thickness on the Photophysical Properties of Core-Shell Perovskite Nanocrystals".ADVANCED OPTICAL MATERIALS (2023).