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Femtosecond Excitonic Relaxation Dynamics of Perovskite on Mesoporous Films of Al 2 O 3 and NiO Nanoparticles
Author(s) -
Hsu HungYu,
Wang ChiYung,
Fathi Amir,
Shiu JiaWei,
Chung ChihChun,
Shen PoShen,
Guo TzungFang,
Chen Peter,
Lee YuanPern,
Diau Eric WeiGuang
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201404213
Subject(s) - non blocking i/o , materials science , photoluminescence , femtosecond , relaxation (psychology) , perovskite (structure) , mesoporous material , excitation , nanoparticle , optoelectronics , nanotechnology , optics , chemistry , crystallography , physics , laser , psychology , social psychology , biochemistry , catalysis , quantum mechanics
The excitonic relaxation dynamics of perovskite adsorbed on mesoporous thin films of Al 2 O 3 and NiO upon excitation at 450 nm were investigated with femtosecond optical gating of photoluminescence (PL) via up‐conversion. The temporal profiles of emission observed in spectral region 670–810 nm were described satisfactorily with a composite consecutive kinetic model and three transient components representing one hot and two cold excitonic relaxations. All observed relaxation dynamics depend on the emission wavelength, showing a systematic time–amplitude correlation for all three components. When the NiO film was employed, we observed an extent of relaxation proceeding through the non‐emissive surface state larger than through the direct electronic relaxation channel, which quenches the PL intensity more effectively than on the Al 2 O 3 film. We conclude that perovskite is an effective hole carrier in a p‐type electrode for NiO‐based perovskite solar cells showing great performance.