Significantly Enhanced Emission Stability of CsPbBr3 Nanocrystals via Chemically Induced Fusion Growth for Optoelectronic Devices
Journal Article
·
· ACS Applied Nano Materials
- Univ. of Missouri, Columbia, MO (United States)
- Washington Univ., St. Louis, MO (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Lead–halide perovskite nanocrystals (PNCs) have attracted much attention in recent years due to their outstanding optical properties. We report here a new chemical route for triggering postsynthetic growth of CsPbBr3 PNCs at room temperature via intentional depletion of stabilizing ligands, resulting in an immediate fusion growth of the as-synthesized PNCs. Upon fusion, the CsPbBr3 PNCs can grow from ca. 8 nm to ca. 60 nm in lateral dimensions in 48 h, reaching about 14 nm in thickness. More importantly, it was found that the fused PNCs have significantly enhanced optical properties. They showed an exceptionally higher stability to photodegradation. They also displayed sharper emission lines and a higher quantum yield, contrary to the fact that the nanocrystals are much larger. The much-improved optical properties are attributed to the Ruddlesden–Popper (RP) planar faults formed during the fusion process and observed using atomic resolution scanning transmission electron microscopy, which are predicted to result in quantum confinement based on density-functional theory calculations. The newly grown nanocrystals with RP defects are expected to significantly improve light emission properties of the PNCs and find applications in light-emitting diodes and other optoelectronic devices.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1493983
- Journal Information:
- ACS Applied Nano Materials, Journal Name: ACS Applied Nano Materials Journal Issue: 11 Vol. 1; ISSN 2574-0970
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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