Phase Tailoring of Ruddlesden–Popper Perovskite at Fixed Large Spacer Cation Ratio

Ruddlesden–Popper (RP) metal halide perovskites are considered as promising optoelectronic materials due to their good environmental stability and desirable optoelectronic properties. However, the phase composition and ordering in the deposited film, with a fixed ratio of large organic spacer cation...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2021-10, Vol.17 (43), p.e2100560-n/a
Main Authors: Guo, Jia, Shi, Zejiao, Xia, Junmin, Wang, Kaiyang, Wei, Qi, Liang, Chao, Zhao, Dandan, Zhang, Zhipeng, Chen, Shula, Liu, Tanghao, Mei, Shiliang, Hui, Wei, Hong, Guo, Chen, Yonghua, Xing, Guichuan
Format: Article
Language:English
Subjects:
carrier dynamics
Cations
Crystallization
Electroluminescence
Free electrons
Lead compounds
light‐emitting diodes
Metal halides
Multi Quantum Wells
Nanotechnology
Optoelectronics
Perovskites
Phase composition
Phase ordering
phase tailoring
Photovoltaic cells
Ruddlesden–Popper perovskite
solar cell
Substrates
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Summary:Ruddlesden–Popper (RP) metal halide perovskites are considered as promising optoelectronic materials due to their good environmental stability and desirable optoelectronic properties. However, the phase composition and ordering in the deposited film, with a fixed ratio of large organic spacer cation in the precursor solution, are hard to be further tailored for specific optoelectronic applications. Herein, it is shown that even with a fixed spacer cation ratio, the phase composition and ordering can still be largely regulated by utilizing different crystallization kinetics of various cations with the inorganic octahedral lead halide. By using two different short cations to compete with the large spacer cation, the phase composition can be continuously tailored from thin multiple quantum wells (MQWs) dominated to 3D perovskite dominated. The phase ordering can be reversed from small n phases’ prior to large n phases’ prior near the substrate. Finally, with the same amount of large spacer cation protection, the perovskite can be tailored for both high‐performance electroluminescence and photovoltaics with favorable energetic landscape for the corresponding desired first‐order excitonic recombination and second‐order free electron–hole recombination, respectively. This exploration substantially contributes to the understanding of precise phase engineering in RP perovskite and may provide a new insight into the design of multiple functional devices. Herein, it is shown that even with a fixed spacer cation ratio, the phase composition and ordering of the deposited Ruddlesden–Popper (RP) perovskite films can still be regulated by utilizing different crystallization kinetics of various short cations with the inorganic octahedral lead halide. Moreover, the favorable phase composition for the function of light‐emitting diodes and solar cells is investigated.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202100560