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Ju-Heon Yoon, Tae-Yeon Seong and Jeung-hyun Jeong Effect of a Mo back contact on Na diffusion in CIGS thin film solar cells Progress in Photovoltaics: Research and Applications 21

Version of Record online: 22 MAR 2012 | DOI: 10.1002/pip.2193

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Na diffusion in Cu(In,Ga)Se2 (CIGS) cells depends strongly on the surface microstructure of molybdenum (Mo) back contact. Mo back contact having less dense surface may enhance the Na doping of CIGS films because of higher oxygen content on the surface resulting in high accumulation of Na-O compound. A trilayered Mo back contact, consisting of very thin surface layer and a conventional bilayer, can provide the better controllability for Na doping as well as electrical and mechanical properties.

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