Optimization of Mo/Cr bilayer back contacts for thin-film solar cells
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2018
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Abstract
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.
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khoshsirat2018optimizationbeilstein
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| Authors | Khoshsirat, Nima;Ali, Fawad;Tiong, Vincent Tiing;Amjadipour, Mojtaba;Wang, Hongxia;Shafiei, Mahnaz;Motta, Nunzio; |
| Journal | beilstein journal of nanotechnology |
| Year | 2018 |
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