TY - JOUR
T1 - Emission Properties and Ultrafast Carrier Dynamics of CsPbCl3 Perovskite Nanocrystals
AU - Ahumada-lazo, Ruben
AU - Alanis, Juan Arturo
AU - Parkinson, Patrick
AU - Binks, David J.
AU - Hardman, Samantha J. O.
AU - Griffiths, James Thomas
AU - Wisnivesky Rocca Rivarola, Florencia
AU - Humphreys, Colin J.
AU - Ducati, Caterina
AU - Davis, Nathaniel J.l.k.
PY - 2019
Y1 - 2019
N2 - Fluence-dependent photoluminescence and ultrafast transient absorption spectroscopy are used to study the dynamic behavior of carriers in CsPbCl3 perovskite nanocrystals. At low excitation fluences, the radiative recombination rate is outcompeted by significant trapping of the charge carriers which then recombine non-radiatively, resulting in weak photoluminescence. As fluence is increased, the saturation of trap states deactivates these non-radiative relaxation paths giving rise to an increase in photoluminescence at first. However, with further increases in fluence, Auger recombination of multiexcitons results in a decline in photoluminescence efficiency. Analysis of this behavior yields an absorption cross-section at 400 nm (3.1 eV) of 0.24 ± 0.05 x 10-14 cm2. Transient photoluminescence and absorption measurements yielded values for single exciton trapping lifetime (1.6 ± 0.7 ns), biexciton and trion lifetimes (20 ± 3 ps and 157 ± 20 ps, respectively), single exciton radiative lifetime (12.7 ± 0.2 ns), intraband cooling lifetime (290 ± 37 fs) and exciton-exciton interaction energy (10 ± 2 meV).
AB - Fluence-dependent photoluminescence and ultrafast transient absorption spectroscopy are used to study the dynamic behavior of carriers in CsPbCl3 perovskite nanocrystals. At low excitation fluences, the radiative recombination rate is outcompeted by significant trapping of the charge carriers which then recombine non-radiatively, resulting in weak photoluminescence. As fluence is increased, the saturation of trap states deactivates these non-radiative relaxation paths giving rise to an increase in photoluminescence at first. However, with further increases in fluence, Auger recombination of multiexcitons results in a decline in photoluminescence efficiency. Analysis of this behavior yields an absorption cross-section at 400 nm (3.1 eV) of 0.24 ± 0.05 x 10-14 cm2. Transient photoluminescence and absorption measurements yielded values for single exciton trapping lifetime (1.6 ± 0.7 ns), biexciton and trion lifetimes (20 ± 3 ps and 157 ± 20 ps, respectively), single exciton radiative lifetime (12.7 ± 0.2 ns), intraband cooling lifetime (290 ± 37 fs) and exciton-exciton interaction energy (10 ± 2 meV).
U2 - 10.1021/acs.jpcc.8b11906
DO - 10.1021/acs.jpcc.8b11906
M3 - Article
SN - 1932-7447
JO - The Journal of Physical Chemistry C
JF - The Journal of Physical Chemistry C
ER -