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AuthorZheng, Kaibo
AuthorZidek, Karel
AuthorAbdellah, Mohamed
AuthorChen, JunSheng
AuthorChabera, Pavel
AuthorZhang, Wei
AuthorAl-Marri, Mohammed J.
AuthorPullerits, Tonu
Available date2021-03-25T11:33:35Z
Publication Date2016
Publication NameACS Energy Letters
ResourceScopus
URIhttp://dx.doi.org/10.1021/acsenergylett.6b00352
URIhttp://hdl.handle.net/10576/18006
AbstractWe 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.
SponsorThis Letter was made possible by NPRP Grant # NPRP7-227-1-034 from the Qatar National Research Fund (a member of the Qatar Foundation). The statements made herein are solely the responsibility of the authors. Collaboration within Nano-Lund is acknowledged.
Languageen
PublisherAmerican Chemical Society
SubjectAbsorption spectroscopy
Conduction bands
Energy gap
Hole traps
Hot electrons
Nanoparticles
organic-inorganic materials
Perovskite
Charge accumulation
Emissive properties
Excitation intensity
Excited-state dynamics
Intensity dependence
Organic-inorganic hybrid
Photogenerated holes
Transient absorption spectroscopies
Excited states
TitleHigh Excitation Intensity Opens a New Trapping Channel in Organic-Inorganic Hybrid Perovskite Nanoparticles
TypeArticle
Pagination1154-1161
Issue Number6
Volume Number1
dc.accessType Abstract Only


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