期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 15, 页码 4160-4164出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201611916
关键词
electron densities; hot carriers; intraband relaxation; multiphonon emission; perovskites
资金
- MSIP (Ministry of Science, ICT and Future Planning), Korea, under the ICT Consilience Creative Program [IITP-R0346-16-1008]
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [2016R1C1B1009709]
- Industrial Technology Innovation Program of MOTIE [10062161]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10062161] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2016R1C1B1009709] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Cesium-based perovskite nanocrystals (NCs) have outstanding photophysical properties improving the performances of lighting devices. Fundamental studies on excitonic properties and hot-carrier dynamics in perovskite NCs further suggest that these materials show higher efficiencies compared to the bulk form of perovskites. However, the relaxation rates and pathways of hot-carriers are still being elucidated. By using ultrafast transient spectroscopy and calculating electronic band structures, we investigated the dependence of halide in Cs-based perovskite (CsPbX3 with X = Br, I, or their mixtures) NCs on the hot-carrier relaxation processes. All samples exhibit ultrafast (< 0.6 ps) hot-carrier relaxation dynamics with following order: CsPbBr3 (310 fs) > CsPbBr1.5I1.5 (380 fs) > CsPbI3 NC (580 fs). These result accounts for a reduced light emission efficiency of CsPbI3 NC compared to CsPbBr3 NC.
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