High Excitation Intensity Opens a New Trapping Channel in Organic–Inorganic Hybrid Perovskite Nanoparticles.
(2016) In ACS Energy Letters 1(6). p.1154-1161- Abstract
- We investigated the excited-state dynamics of CH3NH3PbBr3 perovskite nanoparticles (NPs) and bulk crystals under various excitation intensity regimes using transient absorption spectroscopy. We confirmed the sub-band gap hole trap states with optical transition to the conduction band in both samples. In bulk crystals, the excited-state dynamics is independent of pump intensity. However, in NPs, pronounced intensity dependence appears. At low intensities, the hole trap states do not affect the excited-state dynamics due to the potential barrier between the photogenerated holes and the surface trap states. When the excitation density is much higher than one per NP, charge accumulation makes hot holes overcome the barrier and get trapped with... (More)
- We investigated the excited-state dynamics of CH3NH3PbBr3 perovskite nanoparticles (NPs) and bulk crystals under various excitation intensity regimes using transient absorption spectroscopy. We confirmed the sub-band gap hole trap states with optical transition to the conduction band in both samples. In bulk crystals, the excited-state dynamics is independent of pump intensity. However, in NPs, pronounced intensity dependence appears. At low intensities, the hole trap states do not affect the excited-state dynamics due to the potential barrier between the photogenerated holes and the surface trap states. When the excitation density is much higher than one per NP, charge accumulation makes hot holes overcome the barrier and get trapped with electrons long living in the conduction band (≫10 ns). This explains the high emissive properties of such NPs despite the existence of surface traps. However, in the application of emitting devices requiring high excitation intensity, the surface trapping becomes significant. (Less)
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https://lup.lub.lu.se/record/45310149-59fd-457f-8885-1164f0ef08e2
- author
- Zheng, Kaibo LU ; Zidek, Karel LU ; Abdellah, Mohamed LU ; Chen, Junsheng LU ; Chabera, Pavel LU ; Zhang, Wei ; Al-Marri, Mohammed J. and Pullerits, Tönu LU
- organization
- publishing date
- 2016
- type
- Contribution to journal
- publication status
- published
- subject
- in
- ACS Energy Letters
- volume
- 1
- issue
- 6
- pages
- 8 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:85015213173
- ISSN
- 2380-8195
- DOI
- 10.1021/acsenergylett.6b00352
- language
- English
- LU publication?
- yes
- id
- 45310149-59fd-457f-8885-1164f0ef08e2
- date added to LUP
- 2019-09-14 14:16:51
- date last changed
- 2023-12-03 23:57:46
@article{45310149-59fd-457f-8885-1164f0ef08e2, abstract = {{We investigated the excited-state dynamics of CH3NH3PbBr3 perovskite nanoparticles (NPs) and bulk crystals under various excitation intensity regimes using transient absorption spectroscopy. We confirmed the sub-band gap hole trap states with optical transition to the conduction band in both samples. In bulk crystals, the excited-state dynamics is independent of pump intensity. However, in NPs, pronounced intensity dependence appears. At low intensities, the hole trap states do not affect the excited-state dynamics due to the potential barrier between the photogenerated holes and the surface trap states. When the excitation density is much higher than one per NP, charge accumulation makes hot holes overcome the barrier and get trapped with electrons long living in the conduction band (≫10 ns). This explains the high emissive properties of such NPs despite the existence of surface traps. However, in the application of emitting devices requiring high excitation intensity, the surface trapping becomes significant.}}, author = {{Zheng, Kaibo and Zidek, Karel and Abdellah, Mohamed and Chen, Junsheng and Chabera, Pavel and Zhang, Wei and Al-Marri, Mohammed J. and Pullerits, Tönu}}, issn = {{2380-8195}}, language = {{eng}}, number = {{6}}, pages = {{1154--1161}}, publisher = {{The American Chemical Society (ACS)}}, series = {{ACS Energy Letters}}, title = {{High Excitation Intensity Opens a New Trapping Channel in Organic–Inorganic Hybrid Perovskite Nanoparticles.}}, url = {{http://dx.doi.org/10.1021/acsenergylett.6b00352}}, doi = {{10.1021/acsenergylett.6b00352}}, volume = {{1}}, year = {{2016}}, }