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Experimental study of Cu2ZnSn(Se,S)4 thin films for solar cell applications
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
2011 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Cu2ZnSn(Se,S)4 (CZT(Se,S)) has recently been shown to be a promising material to use in thin film solar cells. It has a band gap of between 1eV (CZTSe) and 1.5eV (CZTS). CZT(Se,S) solar cells have reached 10% efficiency.

 

The aim of this project was to find an effective way to selenise metallic Cu, Zn, Sn films in order to produce Cu2ZnSnSe4 (CZTSe) films, without destroying the metallic molybdenum (Mo) back contact. Another aim was to make films containing both Se and S and to study the possibility to achieve a controlled S/Se ratio in the films. Selenisation and sulfurisation reactions were carried out in quartz ampoules and samples were characterized using scanning electron microscopy, x-ray diffraction and energy dispersive microscopy.

Since Mo reacts rapidly with Se, experiments with selenisation and sulfurisation of plain Mo films were performed. The time and temperature dependence of the thickness of the reacted layer was studied, and it was found that Se reacts much faster with Mo than S does. Pre-sulfurisation of Mo appeared to hinder Se from reacting with the Mo.

 

The next step was to react precursor films to make CZTSe and CZT(Se,S) absorber layers. For mixed Se and S samples, the result is the same as for plain Mo samples; pre-sulfurisation, or inclusion of S in the precursor layer, can prevent selenisation of the Mo. The S/Se ratio was controlled with reaction time. 

 

The best efficiency of 3.2% was obtained for a CZTSe sample while the best CZT(Se,S) sample gave 2.3%.

Place, publisher, year, edition, pages
2011. , 57 p.
Series
TVE, 11019
Identifiers
URN: urn:nbn:se:uu:diva-155091OAI: oai:DiVA.org:uu-155091DiVA: diva2:423719
Presentation
2011-06-07, 3419, Uppsala, 08:30 (English)
Uppsok
Technology
Supervisors
Examiners
Available from: 2011-10-07 Created: 2011-06-16 Last updated: 2011-10-07Bibliographically approved

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