The electronic band structure of quasi-one-dimensional van der Waals semiconductors: the effective hole mass of ZrS 3 compared to TiS 3
- Award ID(s):
- 1740136
- PAR ID:
- 10162953
- Date Published:
- Journal Name:
- Journal of Physics: Condensed Matter
- Volume:
- 32
- Issue:
- 29
- ISSN:
- 0953-8984
- Page Range / eLocation ID:
- 29LT01
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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Exciton dynamics o perovskite nanoclusters has been investigated or the rst time using emtosecond transient absorption (TA) and time-resolved photoluminescence (TRPL) spectroscopy. The TA results show two photoinduced absorption signals at 420 and 461 nm and a photoinduced bleach (PB) signal at 448 nm. The analysis o the PB recovery kinetic decay and kinetic model uncovered multiple processes contributing to electron−hole recombination. The ast component (∼8 ps) is attributed to vibrational relaxation within the initial excited state, and the medium component (∼60 ps) is attributed to shallow carrier trapping. The slow component is attributed to deep carrier trapping rom the initial conduction band edge (∼666 ps) and the shallow trap state (∼40 ps). The TRPL reveals longer time dynamics, with modeled lietimes o 6.6 and 93 ns attributed to recombination through the deep trap state and direct band edge recombination, respectively. The signicant role o exciton trapping processes in the dynamics indicates that these highly conned nanoclusters have deect-rich suraces.more » « less
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