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Complex Surface Che...
Complex Surface Chemistry of Kesterites : Cu/Zn Reordering after Low Temperature Postdeposition Annealing and Its Role in High Performance Devices
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Neuschitzer, Markus (författare)
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Sanchez, Yudania (författare)
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Olar, Tetiana (författare)
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- Thersleff, Thomas (författare)
- Uppsala universitet,Tillämpad materialvetenskap
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Lopez-Marino, Simon (författare)
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Oliva, Florian (författare)
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Espindola-Rodriguez, Moises (författare)
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Xie, Haibing (författare)
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Placidi, Marcel (författare)
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Izquierdo-Roca, Victor (författare)
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Lauermann, Iver (författare)
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- Leifer, Klaus (författare)
- Uppsala universitet,Tillämpad materialvetenskap
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Perez-Rodriguez, Alejandro (författare)
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Saucedo, Edgardo (författare)
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(creator_code:org_t)
- 2015-07-29
- 2015
- Engelska.
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Ingår i: Chemistry of Materials. - : American Chemical Society (ACS). - 0897-4756 .- 1520-5002. ; 27:15, s. 5279-5287
- 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
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- A detailed study explaining the beneficial effects of low temperature postdeposition annealing combined with selective surface etchings for Cu2ZnSnSe4 (CZTSe) based solar cells is presented. After performing a selective oxidizing surface etching to remove ZnSe secondary phases typically formed during the synthesis processes an additional 200 degrees C annealing step is necessary to increase device performance from below 3% power conversion efficiency up to 8.3% for the best case. This significant increase in efficiency can be explained by changes in the surface chemistry which results in strong improvement of the CdS/CZTSe heterojunction commonly used in this kind of absorber/buffer/window heterojunction solar cells. XPS measurements reveal that the 200 degrees C annealing promotes a Cu depletion and Zn enrichment of the etched CZTSe absorber surface relative to the CZTSe bulk. Raman measurements confirm a change in Cu/Zn ordering and an increase in defect density. Furthermore, TEM microstructural investigations indicate a change of grain boundaries composition by a reduction of their Cu content after the 200 degrees C annealing treatment. Additionally, insights in the CdS/CZTSe interface are gained showing a significant amount of Cu in the CdS buffer layer which further helps the formation of a Cu-depleted surface and seems to play an important role in the formation of the pn-heterojunction.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
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Neuschitzer, Mar ...
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Sanchez, Yudania
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Olar, Tetiana
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Thersleff, Thoma ...
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Lopez-Marino, Si ...
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Oliva, Florian
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visa fler...
-
Espindola-Rodrig ...
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Xie, Haibing
-
Placidi, Marcel
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Izquierdo-Roca, ...
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Lauermann, Iver
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Leifer, Klaus
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Perez-Rodriguez, ...
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Saucedo, Edgardo
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visa färre...
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- NATURVETENSKAP
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Chemistry of Mat ...
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Uppsala universitet