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High Excitation Intensity Opens a New Trapping Channel in Organic - Inorganic Hybrid Perovskite Nanoparticles
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SYSNO ASEP 0469197 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název High Excitation Intensity Opens a New Trapping Channel in Organic - Inorganic Hybrid Perovskite Nanoparticles Tvůrce(i) Zheng, K. (QA)
Žídek, Karel (UFP-V) ORCID
Abdellah, M. (EG)
Chen, J.S. (CN)
Chábera, P. (SE)
Zhang, W. (SE)
Al-Marri, M.J. (QA)
Pullerits, T. (SE)Zdroj.dok. ACS ENERGY LETTERS. - : American Chemical Society - ISSN 2380-8195
Roč. 1, č. 6 (2016), s. 1154-1161Poč.str. 8 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova LEAD HALIDE PEROVSKITES ; QUANTUM DOTS ; NANOCRYSTALS Vědní obor RIV BM - Fyzika pevných látek a magnetismus Obor OECD Condensed matter physics (including formerly solid state physics, supercond.) Institucionální podpora UFP-V - RVO:61389021 UT WOS 000390086400013 EID SCOPUS 85015213173 DOI 10.1021/acsenergylett.6b00352 Anotace 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. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2017
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