Optimization of Mo/Cr bilayer back contacts for thin-film solar cells

Khoshsirat, Nima, Ali, Fawad, Tiong, Vincent Tiing, Amjadipour, Mojtaba, Wang, Hongxia, Shafiei, Mahnaz and Motta, Nunzio 2018, Optimization of Mo/Cr bilayer back contacts for thin-film solar cells, Beilstein journal of nanotechnology, vol. 9, pp. 2700-2707, doi: 10.3762/bjnano.9.252.

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Title Optimization of Mo/Cr bilayer back contacts for thin-film solar cells
Author(s) Khoshsirat, Nima
Ali, Fawad
Tiong, Vincent Tiing
Amjadipour, Mojtaba
Wang, Hongxia
Shafiei, Mahnaz
Motta, Nunzio
Journal name Beilstein journal of nanotechnology
Volume number 9
Start page 2700
End page 2707
Total pages 8
Publisher Belstein
Place of publication Frankfurt, Germany
Publication date 2018-10-18
ISSN 2190-4286
Keyword(s) Back contact
Bilayer
Chromium
DC sputtering
Molybdenum
Optical reflectance
Summary Molybdenum (Mo) is the most commonly used material as back contact in thin-film solar cells. Adhesion of Mo film to soda-lime glass (SLG) substrate is crucial to the performance of solar cells. In this study, an optimized bilayer structure made of a thin layer of Mo on an ultra-thin chromium (Cr) adhesion layer is used as the back contact for a copper zinc tin sulfide (CZTS) thin-film solar cell on a SLG substrate. DC magnetron sputtering is used for deposition of Mo and Cr films. The conductivity of Mo/Cr bilayer films, their microstructure and surface morphology are studied at different deposition powers and working pressures. Good adhesion to the SLG substrate has been achieved by means of an ultra-thin Cr layer under the Mo layer. By optimizing the deposition conditions we achieved low surface roughness, high optical reflectance and low sheet resistivity while we could decrease the back contact thickness to 600 nm. That is two thirds to half of the thickness that is currently being used for bilayer and single layer back contact for thin-film solar cells. We demonstrate the excellent properties of Mo/Cr bilayer as back contact of a CZTS solar cell.
Language eng
DOI 10.3762/bjnano.9.252
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2018, Khoshsirat et al.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30118727

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