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Photoinduced Stark ...
Photoinduced Stark Effects and Mechanism of Ion Displacement in Perovskite Solar Cell Materials
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- Pazoki, Meysam (författare)
- Uppsala universitet,Fysikalisk kemi,Strukturkemi,Fasta tillståndets fysik
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- Jacobsson, T. Jesper (författare)
- Swiss Fed Inst Technol, Dept Chem & Chem Engn, Lab Photomol Sci, Stn 6, CH-1015 Lausanne, Switzerland.
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- Kullgren, Jolla, 1978- (författare)
- Uppsala universitet,Strukturkemi
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- Johansson, Erik M. J. (författare)
- Uppsala universitet,Fysikalisk kemi
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- Hagfeldt, Anders (författare)
- Swiss Fed Inst Technol, Dept Chem & Chem Engn, Lab Photomol Sci, Stn 6, CH-1015 Lausanne, Switzerland.
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- Boschloo, Gerrit (författare)
- Uppsala universitet,Fysikalisk kemi
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- Edvinsson, Tomas, 1970- (författare)
- Uppsala universitet,Fasta tillståndets fysik
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(creator_code:org_t)
- 2017-03-06
- 2017
- Engelska.
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Ingår i: ACS Nano. - : AMER CHEMICAL SOC. - 1936-0851 .- 1936-086X. ; 11:3, s. 2823-2834
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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 ABX(3) 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.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Stark effect
- photoinduced ion migration
- perovskite solar cells
- CH3NH3PbI3
- mixed halide perovskites
- cation-dependent ion movement
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