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The Stability in Damp Heat Conditions of Thin-film CIGS Solar Cells With Different Absorber Thickness
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid State Electronics.
2004 In: Proceedings of the 19th European Photovoltaic Solar Energy Conference, Paris, 1890-1893 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2004. 1890-1893 p.
URN: urn:nbn:se:uu:diva-97558OAI: oai:DiVA.org:uu-97558DiVA: diva2:172552
Available from: 2008-09-26 Created: 2008-09-26Bibliographically approved
In thesis
1. Modelling and Degradation Characteristics of Thin-film CIGS Solar Cells
Open this publication in new window or tab >>Modelling and Degradation Characteristics of Thin-film CIGS Solar Cells
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Thin-film solar cells based around the absorber material CuIn1-xGaxSe2 (CIGS) are studied with respect to their stability characteristics, and different ways of modelling device operation are investigated. Two ways of modelling spatial inhomogeneities are detailed, one fully numerical and one hybrid model. In the numerical model, thin-film solar cells with randomized parameter variations are simulated showing how the voltage decreases with increasing material inhomogeneities.

With the hybrid model, an analytical model for the p-n junction action is used as a boundary condition to a numerical model of the steady state electrical conduction in the front contact layers. This also allows for input of inhomogeneous material parameters, but on a macroscopic scale. The simpler approach, compared to the numerical model, enables simulations of complete cells. Effects of material inhomogeneities, shunt defects and grid geometry are simulated.

The stability of CIGS solar cells with varying absorber thickness, varying buffer layer material and CIGS from two different deposition systems are subjected to damp heat treatment. During this accelerated ageing test the cells are monitored using characterization methods including J-V, QE, C-V and J(V)T. The degradation studies show that the typical VOC decrease experienced by CIGS cells subjected to damp heat is most likely an effect in the bulk of the absorber material.

When cells encapsulated with EVA are subjected to the same damp heat treatment, the effect on the voltage is considerably reduced. In this situation the EVA is saturated with moisture, representing a worst case scenario for a module in operation. Consequently, real-life modules will not suffer extensively from the VOC degradation effect, common in unprotected CIGS devices.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2008. 82 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 554
solar cells, thin-film, chalcogenide, stability, characterization, modelling, simulations, finite element method, CIGS, photovoltaic module
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
urn:nbn:se:uu:diva-9291 (URN)978-91-554-7287-0 (ISBN)
Public defence
2008-10-17, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:30
Available from: 2008-09-26 Created: 2008-09-26Bibliographically approved

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