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Trap States and Their Dynamics in Organometal Halide Perovskite Nanoparticles and Bulk Crystals

Zheng, Kaibo LU ; Žídek, Karel LU ; Abdellah, Mohamed LU ; Messing, Maria E. LU ; Al-Marri, Mohammed J. and Pullerits, Tõnu LU (2016) In Journal of Physical Chemistry C 120(5). p.3077-3084
Abstract

Organometal halide perovskites have attracted tremendous attention for optoelectronic applications. Charge carrier trapping is one of the dominant processes often deteriorating the performance of devices. Here, we investigate the details of trap behavior in colloidal nanoparticles (NPs) of CH3NH3PbBr3 perovskites with mean size of 8 nm and the corresponding bulk crystals (BCs). We use excitation intensity dependence of photoluminescence (PL) dynamics together with comprehensive simulation of charge carrier trapping and the trap-state dynamics. In the bulk at very low excitation intensities the PL is quenched by trapping. A considerable fraction of the traps become filled if excitation fluence is... (More)

Organometal halide perovskites have attracted tremendous attention for optoelectronic applications. Charge carrier trapping is one of the dominant processes often deteriorating the performance of devices. Here, we investigate the details of trap behavior in colloidal nanoparticles (NPs) of CH3NH3PbBr3 perovskites with mean size of 8 nm and the corresponding bulk crystals (BCs). We use excitation intensity dependence of photoluminescence (PL) dynamics together with comprehensive simulation of charge carrier trapping and the trap-state dynamics. In the bulk at very low excitation intensities the PL is quenched by trapping. A considerable fraction of the traps become filled if excitation fluence is increased. We identified two different traps, one exhibiting ultralong lifetime (∼70 μs) which leads to efficient accumulation of trap filling even at relatively low excitation intensities. In colloidal NPs, the average number of surface traps is estimated to be 0.7 per NP. It means about 30% excitation would undergo trap-free radiative recombination. The trapping time constant of 7 ns is orders of magnitude longer than the usual trapping times in typical colloidal quantum dots indicating semipassivation of the trap states by a large barrier which slows down the process in the perovskite NPs. We also note that due to the localized character of photogenerated electron-hole pairs in NPs the trapping efficiency is reduced compared to the freely moving charges in BCs. Our results offer insight into the details of photophysics of colloidal perovskite nanoparticles which show promise for light-emitting diode and laser applications.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
120
issue
5
pages
8 pages
publisher
The American Chemical Society
external identifiers
  • scopus:84958092649
ISSN
1932-7447
DOI
10.1021/acs.jpcc.6b00612
language
English
LU publication?
yes
id
d33904e8-41a1-4d02-b9ea-db1b988998d6
date added to LUP
2019-03-20 15:32:47
date last changed
2019-05-21 04:19:50
@article{d33904e8-41a1-4d02-b9ea-db1b988998d6,
  abstract     = {<p>Organometal halide perovskites have attracted tremendous attention for optoelectronic applications. Charge carrier trapping is one of the dominant processes often deteriorating the performance of devices. Here, we investigate the details of trap behavior in colloidal nanoparticles (NPs) of CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> perovskites with mean size of 8 nm and the corresponding bulk crystals (BCs). We use excitation intensity dependence of photoluminescence (PL) dynamics together with comprehensive simulation of charge carrier trapping and the trap-state dynamics. In the bulk at very low excitation intensities the PL is quenched by trapping. A considerable fraction of the traps become filled if excitation fluence is increased. We identified two different traps, one exhibiting ultralong lifetime (∼70 μs) which leads to efficient accumulation of trap filling even at relatively low excitation intensities. In colloidal NPs, the average number of surface traps is estimated to be 0.7 per NP. It means about 30% excitation would undergo trap-free radiative recombination. The trapping time constant of 7 ns is orders of magnitude longer than the usual trapping times in typical colloidal quantum dots indicating semipassivation of the trap states by a large barrier which slows down the process in the perovskite NPs. We also note that due to the localized character of photogenerated electron-hole pairs in NPs the trapping efficiency is reduced compared to the freely moving charges in BCs. Our results offer insight into the details of photophysics of colloidal perovskite nanoparticles which show promise for light-emitting diode and laser applications.</p>},
  author       = {Zheng, Kaibo and Žídek, Karel and Abdellah, Mohamed and Messing, Maria E. and Al-Marri, Mohammed J. and Pullerits, Tõnu},
  issn         = {1932-7447},
  language     = {eng},
  month        = {02},
  number       = {5},
  pages        = {3077--3084},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry C},
  title        = {Trap States and Their Dynamics in Organometal Halide Perovskite Nanoparticles and Bulk Crystals},
  url          = {http://dx.doi.org/10.1021/acs.jpcc.6b00612},
  volume       = {120},
  year         = {2016},
}