Back to Search
Start Over
Compositional tuning of carrier dynamics in Cs 2 Na 1-x Ag x BiCl 6 double perovskite nanocrystals
- Source :
- ACS Energy Letters, Zhu, D, Zito, J, Pinchetti, V, Dang, Z, Olivati, A, Pasquale, L, Tang, A, Zaffalon, M L, Meinardi, F, Infante, I, De Trizio, L, Manna, L & Brovelli, S 2020, ' Compositional Tuning of Carrier Dynamics in Cs 2 Na 1-x Ag x BiCl 6 Double-Perovskite Nanocrystals ', ACS Energy Letters, vol. 5, no. 6, pp. 1840-1847 . https://doi.org/10.1021/acsenergylett.0c00914, ACS Energy Letters, 5(6), 1840-1847. American Chemical Society
- Publication Year :
- 2020
-
Abstract
- We devised a hot-injection synthesis to prepare colloidal double-perovskite Cs2NaBiCl6 nanocrystals (NCs). We also examined the effects of replacing Na+ with Ag+ cations by preparing and characterizing Cs2Na1-x Ag x BiCl6 alloy NCs with x ranging from 0 to 1. Whereas Cs2NaBiCl6 NCs were not emissive, Cs2Na1-x Ag x BiCl6 NCs featured a broad photoluminescence band at ∼690 nm, Stokes-shifted from the respective absorption by ≥1.5 eV. The emission efficiency was maximized for low Ag+ amounts, reaching ∼3% for the Cs2Na0.95Ag0.05BiCl6 composition. Density functional theory calculations coupled with spectroscopic investigations revealed that Cs2Na1-x Ag x BiCl6 NCs are characterized by a complex photophysics stemming from the interplay of (i) radiative recombination via trapped excitons localized in spatially connected AgCl6-BiCl6 octahedra; (ii) surface traps, located on undercoordinated surface Bi centers, behaving as phonon-assisted nonradiative decay channels; and (iii) a thermal equilibrium between trapping and detrapping processes. These results offer insights into developing double-perovskite NCs with enhanced optoelectronic efficiency.
- Subjects :
- Photoluminescence
Materials science
Letter
Exciton
Energy Engineering and Power Technology
02 engineering and technology
Double Perovskite, Nanocrystals, Spectroscopy
010402 general chemistry
01 natural sciences
Materials Chemistry
Spontaneous emission
Absorption (electromagnetic radiation)
FIS/03 - FISICA DELLA MATERIA
Thermal equilibrium
Renewable Energy, Sustainability and the Environment
021001 nanoscience & nanotechnology
0104 chemical sciences
Fuel Technology
Octahedron
Nanocrystal
Chemistry (miscellaneous)
Chemical physics
Density functional theory
0210 nano-technology
SDG 6 - Clean Water and Sanitation
Subjects
Details
- ISSN :
- 23808195
- Database :
- OpenAIRE
- Journal :
- ACS Energy Letters
- Accession number :
- edsair.doi.dedup.....ec262fd5a39fb28ab6754b3686f3755a
- Full Text :
- https://doi.org/10.1021/acsenergylett.0c00914