Investigation of blister formation in sputtered Cu 2ZnSnS 4 absorbers for thin film solar cells
2015 (English)In: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, ISSN 0734-2101, E-ISSN 1520-8559, Vol. 33, no 6, 061201Article in journal (Refereed) Published
Blister formation in Cu2ZnSnS4 (CZTS) thin films sputtered from a quaternary compound target is investigated. While the thin film structure, composition, and substrate material are not correlated to the blister formation, a strong link between sputtering gas entrapment, in this case argon, and blistering effect is found. It is shown that argon is trapped in the film during sputtering and migrates to locally form blisters during the high temperature annealing. Blister formation in CZTS absorbers is detrimental for thin film solar cell fabrication causing partial peeling of the absorber layer and potential shunt paths in the complete device. Reduced sputtering gas entrapment, and blister formation, is seen for higher sputtering pressure, higher substrate temperature, and change of sputtering gas to larger atoms. This is all in accordance with previous publications on blister formation caused by sputtering gas entrapment in other materials.
Place, publisher, year, edition, pages
2015. Vol. 33, no 6, 061201
Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-268542DOI: 10.1116/1.4926754ISI: 000365503800014OAI: oai:DiVA.org:uu-268542DiVA: diva2:877512
FunderSwedish Energy Agency