Journal article
Photoinduced Stark Effects and Mechanism of Ion Displacement in Perovskite Solar Cell Materials.
- Pazoki M Department of Chemistry - Ångström Laboratory, Physical Chemistry, Uppsala University , Box 523, SE 75120 Uppsala, Sweden.
- Jacobsson TJ Laboratory of Photomolecular Science, Department of Chemistry and Chemical Engineering, Swiss Federal Institute of Technology , Station 6, CH-1015 Lausanne, Switzerland.
- Kullgren J Department of Chemistry - Ångström Laboratory, Structural Chemistry, Uppsala University , Box 538, SE 75120 Uppsala, Sweden.
- Johansson EM Department of Chemistry - Ångström Laboratory, Physical Chemistry, Uppsala University , Box 523, SE 75120 Uppsala, Sweden.
- Hagfeldt A Laboratory of Photomolecular Science, Department of Chemistry and Chemical Engineering, Swiss Federal Institute of Technology , Station 6, CH-1015 Lausanne, Switzerland.
- Boschloo G Department of Chemistry - Ångström Laboratory, Physical Chemistry, Uppsala University , Box 523, SE 75120 Uppsala, Sweden.
- Edvinsson T Department of Engineering Sciences, Solid State Physics, Uppsala University , Box 534, SE 751 21 Uppsala, Sweden.
- 2017-02-28
Published in:
- ACS nano. - 2017
CH3NH3PbI3
Stark effect
cation-dependent ion movement
mixed halide perovskites
perovskite solar cells
photoinduced ion migration
English
Organometallic halide perovskites (OMHPs) have recently emerged as a promising class of materials in photovoltaic technology. Here, we present an in-depth investigation of the physics in these systems by measuring the photoinduced absorption (PIA) in OMHPs as a function of materials composition, excitation wavelength, and modulation frequency. We report a photoinduced Stark effect that depends on the excitation wavelength and on the dipole strength of the monovalent cations in the A position of the ABX3 perovskite. The results presented are corroborated by density functional theory calculations and provide fundamental information about the photoinduced local electric field change under blue and red excitation as well as insights into the mechanism of light-induced ion displacement in OMHPs. For optimized perovskite solar cell devices beyond 19% efficiency, we show that excess thermalization energy of blue photons plays a role in overcoming the activation energy for ion diffusion.
- Language
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- English
- Open access status
- closed
- Identifiers
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- DOI 10.1021/acsnano.6b07916
- PMID 28240871
- Persistent URL
- https://sonar.ch/global/documents/294659
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