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Updated: Apr 15, 2026
Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
Enhanced stability and ultraviolet photodetection performance in CsPbBr3 nanoplatelets via FA doping
Le Luo1, Xiaoming Mo1, Yusheng Song1
1School of Physical Science and Technology, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, China. xmmo@gxu.edu.cn.
Researchers improved the stability of cesium lead bromide nanoplatelets for UV photodetectors using alloying and ligand strategies. This enhances device performance and durability for practical applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Quantum-confined cesium lead bromide nanoplatelets (CsPbBr3 NPLs) show promise for UV/blue photodetectors due to high binding energy and absorption.
- However, their soft lattice and surface defects cause poor operational stability, hindering practical use.
Purpose of the Study:
- To enhance the structural rigidity and defect formation energy of CsPbBr3 NPLs.
- To improve the conductivity and UV irradiation stability of CsPbBr3-based NPLs for photodetector applications.
Main Methods:
- An A-site alloying strategy was employed using formamidinium (FA+) cations to compensate for Cs+ vacancies.
- Short-chain tetrolic acid (TLA) ligands were used to passivate uncoordinated Pb2+ ions, addressing surface defects.
Main Results:
- The dual repair strategy (alloying and ligand passivation) significantly improved CsPbBr3 NPLs' conductivity and UV stability.
- Self-powered UV photodetectors based on Cs0.73FA0.27PbBr3-TLA NPLs achieved high responsivity (89 mA W-1) and specific detectivity (3.99 × 1012 Jones).
- Devices maintained excellent photoresponse and high specific detectivity (1.73 × 1012 Jones) after 30 days of ambient storage.
Conclusions:
- The combined lattice and surface engineering approach effectively enhances the performance and durability of perovskite NPL-based UV photodetectors.
- This strategy offers a pathway for developing high-performance, stable optoelectronic devices for UV detection.
