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Zn(O,S) Buffer Layers and Thickness Variations of CdS Buffer for Cu2ZnSnS4 Solar Cells

Ericson, Tove, 1983- (author)
Uppsala universitet,Fasta tillståndets elektronik,Ångström Solar Center
Scragg, Jonathan J. (author)
Uppsala universitet,Fasta tillståndets elektronik,Ångström Solar Center
Hultqvist, Adam (author)
Uppsala universitet,Fasta tillståndets elektronik,Ångström Solar Center
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Wätjen, Jörn Timo (author)
Uppsala universitet,Fasta tillståndets elektronik,Ångström Solar Center
Szaniawski, Piotr (author)
Uppsala universitet,Fasta tillståndets elektronik,Ångström Solar Center
Törndahl, Tobias (author)
Uppsala universitet,Fasta tillståndets elektronik,Ångström Solar Center
Platzer-Björkman, Charlotte (author)
Uppsala universitet,Fasta tillståndets elektronik,Ångström Solar Center
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 (creator_code:org_t)
2014
2014
English.
In: IEEE Journal of Photovoltaics. - 2156-3381. ; 4:1, s. 465-469
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • To improve the conduction band alignment and explore the influence of the buffer-absorber interface, we here investigate an alternative buffer for Cu2ZnSnS4 (CZTS) solar cells. The Zn(O, S) system was chosen since the optimum conduction band alignment with CZTS is predicted to be achievable, by varying oxygen to sulfur ratio. Several sulfur to oxygen ratios were evaluated to find an appropriate conduction band offset. There is a clear trend in open-circuit voltage Voc, with the highest values for the most sulfur rich buffer, before going to the blocking ZnS, whereas the fill factor peaks at a lower S content. The best alternative buffer cell in this series had an efficiency of 4.6% and the best CdS reference gave 7.3%. Extrapolating Voc values to 0 K gave activation energies well below the expected bandgap of 1.5 eV for CZTS, which indicate that recombination at the interface is dominating. However, it is clear that the values are affected by the change of buffer composition and that increasing sulfur content of the Zn(O, S) increases the activation energy for recombination. A series with varying CdS buffer thickness showed the expected behavior for short wavelengths in quantum efficiency measurements but the final variation in efficiency was small.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Keyword

Cu2ZnSnS4
CZTS
Current-voltage characteristics
Zn(O
S) buffer
kesterite photovoltaic cells
Teknisk fysik med inriktning mot elektronik
Engineering Science with specialization in Electronics

Publication and Content Type

ref (subject category)
art (subject category)

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