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A Modular Microfluidic Technology for Systematic Studies of Colloidal Semiconductor Nanocrystals
Published on: May 10, 2018
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Lead-Free Cesium Titanium Bromide Double Perovskite Nanocrystals
G Krishnamurthy Grandhi1, Anastasia Matuhina1, Maning Liu1
1Hybrid Solar Cells, Faculty of Engineering and Natural Sciences, Tampere University, P.O. Box 541, FI-33014 Tampere, Finland.
Nanomaterials (Basel, Switzerland)
|June 2, 2021
Summary
This study presents the first colloidal synthesis of lead-free double perovskite nanocrystals, Cs2TiX6. These materials show potential for nonlinear optical applications, specifically third-harmonic generation, despite lacking photoluminescence.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Double perovskites offer lead-free alternatives for optoelectronics.
- Cs2TiBr6, a titanium-based double perovskite, has shown mixed results regarding photoluminescence and stability.
- Exploration at the nanoscale is crucial for understanding novel material properties.
Purpose of the Study:
- To demonstrate the colloidal synthesis of Cs2TiX6 (X = Br, Cl) nanocrystals.
- To investigate the optical properties and stability of Cs2TiBr6 nanocrystals.
- To explore the potential of Cs2TiBr6 for nonlinear optical applications, particularly third-harmonic generation (THG).
Main Methods:
- Colloidal synthesis of Cs2TiX6 nanocrystals with tunable morphology and size.
- Characterization of nanocrystal properties including bandgap and stability.
- Detection of third-harmonic generation (THG) signals using THG microscopy.
Main Results:
- Successful synthesis of Cs2TiX6 nanocrystals with controllable size and morphology.
- Cs2TiBr6 nanocrystals exhibit a 1.9 eV bandgap and stability in suspension for up to 8 weeks.
- No significant photoluminescence was observed, but clear THG signals were detected, indicating nonlinear optical activity.
Conclusions:
- Colloidal synthesis provides a route to nanoscale Cs2TiX6 materials.
- Cs2TiBr6 nanocrystals are stable and possess third-harmonic generation capabilities.
- This research highlights lead-free double perovskites as promising candidates for unexplored nonlinear optical applications.
