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Interfacial B-Site Ion Diffusion in All-Inorganic Core/Shell Perovskite Nanocrystals
Shuya Li1, Hanjie Lin1, Chun Chu1
1Department of Chemistry, Syracuse University, Syracuse, New York 13244, United States.
ACS Nano
|November 14, 2023
Summary
We developed lead-free perovskite core/shell nanocrystals (NCs) with enhanced stability and tunable colors. This involves a CsMnCl3 shell on CsPbCl3 NCs, enabling Mn diffusion for adjustable photoluminescence.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- All-inorganic metal halide perovskites (ABX3) are promising for optoelectronics but face challenges with lead toxicity and instability.
- Shell passivation using stable, lead-free perovskites offers a route to improve environmental stability and tune optical properties.
- Growing core/shell perovskite nanocrystals (NCs) is difficult due to the soft ionic lattice.
Purpose of the Study:
- To develop a facile method for creating core/shell perovskite NCs with enhanced stability and tunable optical properties.
- To investigate the potential of using a lead-free perovskite shell for passivation and property tuning.
- To explore interfacial B-site ion diffusion as a mechanism for achieving color tunability.
Main Methods:
- Fabrication of CsPbCl3/CsMnCl3 core/shell perovskite nanocrystals (NCs).
- Utilizing a lead-free CsMnCl3 shell to passivate CsPbCl3 cores.
- Investigating B-site Mn ion diffusion from the shell to the core via thermal annealing.
Main Results:
- Achieved enhanced environmental stability and improved photoluminescence quantum yields (QYs) in CsPbCl3/CsMnCl3 core/shell NCs.
- Demonstrated color-tunable photoluminescence (PL) through interfacial Mn diffusion, creating Mn-doped CsPbCl3 cores (Mn:CsPbCl3).
- Showcased tunable Mn PL emission around 600 nm, dependent on thermal annealing time.
Conclusions:
- Interfacial B-site diffusion in core/shell perovskite NCs is a viable strategy for simultaneous enhancement of environmental stability and optical property tuning.
- This approach offers a promising alternative to traditional halide anion exchange for band-gap engineering in perovskite materials.
- The developed CsPbCl3/CsMnCl3 core/shell NCs present a pathway towards safer and more versatile lead-free perovskite optoelectronic devices.
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