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المؤلفZheng, Kaibo
المؤلفZidek, Karel
المؤلفAbdellah, Mohamed
المؤلفChen, JunSheng
المؤلفChabera, Pavel
المؤلفZhang, Wei
المؤلفAl-Marri, Mohammed J.
المؤلفPullerits, Tonu
تاريخ الإتاحة2021-03-25T11:33:35Z
تاريخ النشر2016
اسم المنشورACS Energy Letters
المصدرScopus
معرّف المصادر الموحدhttp://dx.doi.org/10.1021/acsenergylett.6b00352
معرّف المصادر الموحدhttp://hdl.handle.net/10576/18006
الملخصWe 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.
راعي المشروعThis 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.
اللغةen
الناشرAmerican Chemical Society
الموضوعAbsorption 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
العنوانHigh Excitation Intensity Opens a New Trapping Channel in Organic-Inorganic Hybrid Perovskite Nanoparticles
النوعArticle
الصفحات1154-1161
رقم العدد6
رقم المجلد1
dc.accessType Abstract Only


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