Excitation Wavelength Dependent Interfacial Charge Transfer Dynamics in a CH3NH3PbI3 Perovskite Film 

Liu, M, Endo, M, Shimazaki, A, wakamiya, A and Tachibana, Y 2018, 'Excitation Wavelength Dependent Interfacial Charge Transfer Dynamics in a CH3NH3PbI3 Perovskite Film ', Journal of Photopolymer Science and Technology, vol. 31, no. 5, pp. 633-642.


Document type: Journal Article
Collection: Journal Articles

Title Excitation Wavelength Dependent Interfacial Charge Transfer Dynamics in a CH3NH3PbI3 Perovskite Film 
Author(s) Liu, M
Endo, M
Shimazaki, A
wakamiya, A
Tachibana, Y
Year 2018
Journal name Journal of Photopolymer Science and Technology
Volume number 31
Issue number 5
Start page 633
End page 642
Total pages 10
Publisher Technical Association of Photopolymers Japan
Abstract Elucidation of interfacial charge separation and recombination mechanisms is crucial to improve performance of organic-inorganic metal halide perovskite solar cells. Here, we have investigated influence of initially populated electron and hole potential levels in a perovskite conduction band (CB) and valence band (VB), respectively, by altering an excitation wavelength on interfacial charge separation and recombination dynamics in a CH3NH3PbI3 perovskite film sandwiched by a mesoporous TiO2 structure as an electron transport material (ETM) and a spiro-OMeTAD film as a hole transport material (HTM). Multi-phasic electron injection reactions are observed over <1.2 to several tens of nanoseconds, while most of holes are injected to a spiro-OMeTAD layer within the transient emission spectroscopy instrument response time (1.2 ns). In contrast, interfacial charge recombination rates are slower (from 5ms to 1.3 s) with the increase of the excitation wavelength. These kinetics suggest that as long as low excitation intensity is employed, e.g. 10 nJ/cm2 or 1 sun (100 mW/cm2), the APCE of ~100% can be expected at any excitation wavelength for the solar cells based on FTO/c-TiO2/m-TiO2/MAPbI3/OMeTAD films.
Subject Physical Chemistry of Materials
Chemical Thermodynamics and Energetics
Functional Materials
Keyword(s) CH3NH3PbI3 perovskite film
Electron injection
Hole injection
Interfacial charge recombination
Excitation wavelength dependence
DOI - identifier 10.2494/photopolymer.31.633
Copyright notice © 2018 The Society of Photopolymer Science and Technology (SPST)
ISSN 0914-9244
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