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Spray-driven halide exchange in solid-state CsPbX3 nanocrystal films
R I Sánchez-Alarcón1,2, J Noguera-Gomez1, V S Chirvony1
1UMDO Instituto de Ciencia de los Materiales-Universidad de Valencia, PO Box 22085, 46071, Valencia, España, Spain. Rafael.Abargues@uv.es.
Nanoscale
|September 1, 2022
Summary
This study introduces a novel spray-coating method for creating stable CsPbBr3-xIx perovskite nanocrystal (NC) thin films. This technique enhances photoluminescence quantum yield (PLQY) and allows for tunable emission, overcoming previous fabrication challenges.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Cesium lead iodide (CsPbI3) perovskite nanocrystals (NCs) are key for optoelectronics but suffer from phase instability.
- The transition to a non-radiative phase necessitates inert atmosphere fabrication, increasing costs and complexity.
- Mixed halide CsPbBr3-xIx NCs offer improved stability, but their thin-film fabrication with high photoluminescence quantum yield (PLQY) remains challenging.
Purpose of the Study:
- To develop a facile, open-air, and annealing-free method for fabricating stable CsPbBr3-xIx perovskite nanocrystal thin films.
- To achieve high optical quality and enhanced PLQY in CsPbBr3-xIx NC thin films.
- To demonstrate tunable emission properties and potential for optoelectronic applications.
Main Methods:
- Solid-state anion exchange via spray coating of hydroiodic acid (HI) solution onto CsPbBr3 NC thin films.
- Ambient condition processing without the need for an inert atmosphere or post-deposition annealing.
- Characterization of optical properties, including PLQY and emission spectra, before and after halide exchange.
Main Results:
- Successful fabrication of CsPbBr3-xIx NC thin films with high optical quality using spray-driven anion exchange.
- Record high PLQY achieved, increasing from ~61% for CsPbBr3 to ~84% for CsPbBr3-xIx.
- Tunable emission wavelengths from 520 nm to 670 nm demonstrated by controlling the volume of sprayed HI solution.
- Low-threshold amplified spontaneous emission observed, confirming the material's potential.
Conclusions:
- Spray-driven solid-state anion exchange is a viable and efficient method for producing stable CsPbBr3-xIx perovskite nanocrystal thin films.
- The developed technology offers a cost-effective and convenient alternative for fabricating high-performance optoelectronic devices.
- The tunable emission and enhanced PLQY highlight the significant potential of these materials for advanced photonic applications.
