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Air-Exposure Induce...
Air-Exposure Induced Dopant Redistribution and Energy Level Shifts in Spin-Coated Spiro-MeOTAD Films
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- Hawash, Zafer (författare)
- Okinawa Institute of Science and Technology, JPN
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- Ono, Luis K. (författare)
- Okinawa Institute of Science and Technology, JPN
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- Raga, Sonia R. (författare)
- Okinawa Institute of Science and Technology, JPN
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- Lee, Michael V. (författare)
- Okinawa Institute of Science and Technology, JPN
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- Qi, Yabing (författare)
- Okinawa Institute of Science and Technology, JPN
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(creator_code:org_t)
- 2015-01-13
- 2015
- Engelska.
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Ingår i: Chemistry of Materials. - : American Chemical Society (ACS). - 0897-4756 .- 1520-5002. ; 27:2, s. 562-569
- Relaterad länk:
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https://doi.org/10.1...
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https://kau.diva-por... (primary) (Raw object)
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- Doping properties of 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-MeOTAD) hole transport layer are investigated by X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, and atomic force microscopy under air exposure. XPS results reveal that 3 h exposure of Li-bis(trifluoromethanesulfonyl)-imide (LiTFSI) doped spiro-MeOTAD to air results in the migration of LiTFSI from the bottom to the top across the spiro-MeOTAD film. AFM images reveal the presence of pinholes with an average diameter of similar to 135 nm and a density of similar to 3.72 holes/mu m(2). In addition, cross-sectional scanning electron microscope images reveal that these pinholes form channels across the doped spiro-MeOTAD film. Optical microscopy and Fourier transform infrared microscopy images confirm the presence of large pinholes with diameters in the range of 1-20 mu m and a density of similar to 289 holes/mm(2) as well. The presence of pinholes may play a major role in the migration processes of the LiTFSI within the spiro-MeOTAD film as well as on the degradation processes of solar cells. This is further confirmed by the rapid decreasing efficiency of perovskite solar cells with solution prepared doped spiro-MeOTAD layers when exposed to air.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
Nyckelord
- Materialteknik
- Materials Engineering
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- ref (ämneskategori)
- art (ämneskategori)
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