Ternary Hybrid Perovskite Solid Solution Single Crystals: Growth, Composition Determination and Phase Stability in Highly Moist Atmosphere

Ternary hybrid perovskite solid solutions have shown superior optoelectronic properties and better stability than their ABX3 simple perovskite counterparts under ambient conditions. However, crystal growth and identification of the accurate composition of these complex crystalline compounds remain c...

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Bibliographic Details
Published in:Chemistry : a European journal 2021-10, Vol.27 (55), p.13765-13773
Main Authors: Tao, Kezheng, Gao, Lei, Yan, Qingfeng
Format: Article
Language:English
Subjects:
Atmosphere
Cesium ions
Chemistry
Composition
Crystal growth
Crystals
Fluorescence
hybrid perovskites
moisture stability
Optoelectronics
Perovskites
phase segregation
Phase stability
Relative humidity
Single crystals
Solid solutions
Ternary systems
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Summary:Ternary hybrid perovskite solid solutions have shown superior optoelectronic properties and better stability than their ABX3 simple perovskite counterparts under ambient conditions. However, crystal growth and identification of the accurate composition of these complex crystalline compounds remain challenging, and their stability under extreme conditions such as in highly moist atmosphere is unknown. Herein, large‐size (up to 2 cm) single crystals of ternary perovskite 0.80FAPbI3 ⋅ x′FAPbBr3 ⋅ y′CsPbI3 (x′+y′=0.20) are grown. An elemental analysis method based on wavelength dispersive X‐ray fluorescence is proposed to determine their accurate compositions. Among these single crystals, the composition with y′=0.12 shows the best moisture stability at 90 % relative humidity for 15 days. Other components with richer or poorer Cs+ ions undergo different phase segregation behaviours. The performance and stability of photodetectors based on these single crystals are tested. This work offers a deeper insight into phase stability of ternary hybrid perovskite solid solution crystals in highly moist atmosphere. Two‐centimeter‐sized ternary hybrid perovskite solid solution single crystals have been grown. Wavelength disperse X‐ray fluorescence is used as a quantitative elemental analysis method. The crystals with optimized composition show superior phase stability when they are stored in high‐humidity environment for over two weeks, while those Cs‐richer or Cs‐poorer samples undergo various degrees of phase segregation induced by moisture.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.202101655