標題: Femtosecond Excitonic Relaxation Dynamics of Perovskite on Mesoporous Films of Al2O3 and NiO Nanoparticles
作者: Hsu, Hung-Yu
Wang, Chi-Yung
Fathi, Amir
Shiu, Jia-Wei
Chung, Chih-Chun
Shen, Po-Shen
Guo, Tzung-Fang
Chen, Peter
Lee, Yuan-Pern
Diau, Eric Wei-Guang
交大名義發表
應用化學系
應用化學系分子科學碩博班
National Chiao Tung University
Department of Applied Chemistry
Institute of Molecular science
關鍵字: exciton relaxation;femtochemistry;kinetics;perovskite;solar cells
公開日期: 25-Aug-2014
摘要: The excitonic relaxation dynamics of perovskite adsorbed on mesoporous thin films of Al2O3 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 Al2O3 film. We conclude that perovskite is an effective hole carrier in a p-type electrode for NiO-based perovskite solar cells showing great performance.
URI: http://dx.doi.org/10.1002/anie.201404213
http://hdl.handle.net/11536/25218
ISSN: 1433-7851
DOI: 10.1002/anie.201404213
期刊: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume: 53
Issue: 35
起始頁: 9339
結束頁: 9342
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