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Achieving Ultrahigh Efficiency Vacancy-Ordered Double Perovskite Microcrystals via Ionic Liquids
Mengyan Cao1, Zhilin Li1, Xiujian Zhao1
1State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|September 23, 2022
Summary
Highly stable, lead-free perovskites with enhanced quantum efficiency were synthesized using ionic liquids. This method significantly boosts photoluminescence quantum yields (PLQYs) for improved optoelectronic applications.
Area of Science:
- Materials Science
- Solid State Chemistry
- Photovoltaics
Background:
- Lead-free perovskites are promising for optoelectronics but suffer from instability and low quantum efficiency.
- Developing stable, high-performance lead-free perovskites is crucial for advancing photovoltaic and optoelectronic technologies.
Purpose of the Study:
- To develop a general, scalable route for synthesizing highly stable lead-free perovskites with enhanced quantum efficiency.
- To investigate the use of ionic liquids (ILs) in improving the properties of vacancy-ordered double perovskites.
Main Methods:
- Synthesis of vacancy-ordered double perovskites (Cs2ZrCl6, Cs2SnCl6) and their doped variants (Bi3+, Sb3+) in ionic liquid solutions.
- Characterization of crystalline structures and photoluminescence quantum yields (PLQYs).
- Density functional theory (DFT) calculations to understand the role of ILs.
Main Results:
- IL-based synthesis yielded high-quality crystalline structures with significantly enhanced PLQYs (up to 200% increase compared to HCl system).
- Sb-doped Cs2ZrCl6 exhibited a record PLQY of 90.2% with excellent thermal stability.
- DFT calculations confirmed ILs improve crystal quality and reduce energy loss.
Conclusions:
- Ionic liquids provide a straightforward method for producing ultrahigh quantum efficiency, thermally stable vacancy-ordered double perovskites.
- These materials demonstrate potential for high-performance white light-emitting diodes and optical anti-counterfeiting applications.
