The impact of selenisation on damp heat degradation of the CIGS back contact molybdenum
conference paper
Molybdenum (Mo) degrades under the influence of damp heat, thereby reducing the output of CIGS PV. In this study, Mo layers were deposited on a glass substrate by magnetron sputtering, thereby varying the deposition pressure and the addition of selenium. These samples were thoroughly analysed and degraded at 60°C/60% relative humidity (RH) and 85°C /85% RH. The degraded non-selenised Mo samples showed a volume increase and the formation of a bilayer structure. Measurements indicated that the top layers consist of MoO x with x≈2.88 when degraded at 60°C/60% RH. The selenised layers formed multilayer structures and needles and spheres of both MoO x and selenium containing materials. We conclude that degradation of Mo can cause a volume increase and the complete loss of conductivity. Furthermore, it was observed that selenium greatly influence of the degradation of Mo. © 2012 IEEE.
TNO Identifier
485635
ISSN
01608371
ISBN
9781467328883
Article nr.
6656703
Source title
2012 IEEE 38th Photovoltaic Specialists Conference, PVSC 2012, 3 June 2012 through 8 June 2012, Austin, TX
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