Magnetron Sputtered Molybdenum Oxide for Application in Polymers Solar Cells

Thin films of molybdenum oxide were deposited by radio frequency (RF) magnetron sputtering in Ar from a MoO3 target at different deposition power on glass and silicon substrates. The thickness of the films was determined by profilometer measurements and by ellipsometry. The films were annealed in ai...

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Bibliographic Details
Published in:Journal of physics. Conference series 2016-10, Vol.764 (1), p.12022
Main Authors: Sendova-Vassileva, M, Dikov, Hr, Vitanov, P, Popkirov, G, Gergova, R, Grancharov, G, Gancheva, V
Format: Article
Language:English
Subjects:
Annealing
Butyric acid
Crystal structure
Current voltage characteristics
Deposition
Ellipsometry
Glass substrates
Magnetron sputtering
Molybdenum
Molybdenum oxides
Oxidation
Photoelectrons
Photovoltaic cells
Physics
Polystyrene resins
Profilometers
Radio frequency
Raman spectroscopy
Silicon substrates
Solar cells
Spectrum analysis
Spin coating
Thickness
Thin films
Valence
X ray photoelectron spectroscopy
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Summary:Thin films of molybdenum oxide were deposited by radio frequency (RF) magnetron sputtering in Ar from a MoO3 target at different deposition power on glass and silicon substrates. The thickness of the films was determined by profilometer measurements and by ellipsometry. The films were annealed in air at temperatures between 200 and 400°C in air. The optical transmission and reflection spectra were measured. The conductivity of the as deposited and annealed films was determined. The crystal structure was probed by Raman spectroscopy. The oxidation state of the surface was studied by X-ray photoelectron spectroscopy (XPS) spectroscopy. The deposition technique described above was used to experiment with MoOx as a hole transport layer (HTL) in polymer solar cells with bulk hetrojunction active layer, deposited by spin coating. The performance of these layers was compared with poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), which is the standard material used in this role. The measured current-voltage characteristics of solar cells with the structure glass/ITO/HTL/Poly(3-hexyl)thiophene (P3HT):[6,6]-phenyl-C61- butyric acid methyl ester (PCBM)/Al demonstrate that the studied MoOx layer is a good HTL and leads to comparable characteristics to those with PEDOT:PSS. On the other hand the deposition by magnetron sputtering guarantees reliable and repeatable HTLs.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/764/1/012022