Journal
NANO LETTERS
Volume 20, Issue 12, Pages 8847-8853Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03833
Keywords
oleylphosphonic acid; perovskite nanocrystals; NMR
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Funding
- programme for research under the Marie Sklodowska-Curie Grant [691185, EPFD0118]
- Italian Ministry of University and Research (MIUR)
- Flag-Era JTC2019 project Solution-Processed Perovskite/Graphene Nanocomposites for Self-Powered Gas Sensors (PeroGaS)
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We employed oleylphosphonic acid (OLPA) for the synthesis of CsPbBr3 nanocrystals (NCs). Compared to phosphonic acids with linear alkyl chains, OLPA features a higher solubility in apolar solvents, allowing us to work at lower synthesis temperatures (100 degrees C), which in turn offer a good control over the NCs size. This can be reduced down to 5.0 nm, giving access to the strong quantum confinement regime. OLPA-based NCs form stable colloidal solutions at very low concentrations (similar to 1 nM), even when exposed to air. Such stability stems from the high solubility of OLPA in apolar solvents, which enables these molecules to reversibly bind/unbind to/from the NCs, preventing the NCs aggregation/precipitation. Small NCs feature efficient, blue-shifted emission and an ultraslow emission kinetics at cryogenic temperature, in striking difference to the fast decay of larger particles, suggesting that size-related exciton structure and/or trapping-detrapping dynamics determine the thermal equilibrium between coexisting radiative processes.
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