Ligands Anchoring Stabilizes Metal Halide Perovskite Nanocrystals

被引:8
作者
Gong, Maogang [1 ]
Timalsina, Bikash [2 ]
Sakidja, Ridwan [2 ]
Douglas, Justin T. [3 ]
Wu, Judy Z. [1 ]
机构
[1] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
[2] Univ Springfield, Dept Phys Astron & Mat Sci Missouri State, Lawrence, MO 65897 USA
[3] Univ Kansas, Mol Struct Grp, Lawrence, KS 66045 USA
关键词
cesium lead halide perovskite; ligand anchoring; nanocrystals; photodetector; stability; LIGHT-EMITTING-DIODES; HIGHLY LUMINESCENT; ULTRASENSITIVE DETECTION; CSPBI3; NANOCRYSTALS; QUANTUM DOTS; EFFICIENT; PHASE; OPPORTUNITIES; GROWTH; BR;
D O I
10.1002/adom.202101012
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Instability of colloidal iodine-based inorganic perovskite CsPbX3 (X = Cl, Br, I) nanocrystals (IPNCs) represents a major obstacle in lead-halide IPNC research and application. Herein, a ligand-anchoring process is reported that enables significantly improved colloidal stability of the iodine-based IPNCs for over 10 months in ambient. Apart from the previous efforts in searching for strong binding ligands to cap the IPNCs to incrementally reduce the exposure of the IPNC surface to the harsh colloidal environment, the ligand-anchoring method demonstrates that such an exposure can be reduced substantially by suppressing the dynamic ligand exchange around the colloidal IPNCs. In the IPNC synthesis solution with common oleic acid (OA) and oleylamine (OLA) ligands with relative weak binding to IPNCs, a systematic reduction of the ligand concentration using hexane by an order of magnitude has shown to be effective in achieving OA/OLA ligand-anchored iodine-based IPNCs with superior stability as confirmed in optical absorption, photoluminescence, H-1 solution nuclear magnetic resonance spectroscopy, and photoresponse. This result has revealed that the intermittent exposure of the IPNC surface during the dynamic ligand exchange is a primary mechanism underlying the colloidal IPNC instability, which can be resolved in the ligand-anchoring process by suppressing such dynamic activities.
引用
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页数:14
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