DocumentCode
26860
Title
Inline Cu(In,Ga)Se 
Co-evaporation for High-Efficiency Solar Cells and Modules
Author
Lindahl, J. ; Zimmermann, U. ; Szaniawski, P. ; Torndahl, T. ; Hultqvist, A. ; Salome, Pedro ; Platzer-Bjorkman, Charlotte ; Edoff, M.
Author_Institution
Angstrom Solar Center, Uppsala Univ., Uppsala, Sweden
Volume
3
Issue
3
fYear
2013
fDate
Jul-13
Firstpage
1100
Lastpage
1105
Abstract
In this paper, co-evaporation of Cu(In,Ga)Se2 (CIGS) in an inline single-stage process is used to fabricate solar cell devices with up to 18.6% conversion efficiency using a CdS buffer layer and 18.2% using a Zn1-xSnxOy Cd-free buffer layer. Furthermore, a 15.6-cm2 mini-module, with 16.8% conversion efficiency, has been made with the same layer structure as the CdS baseline cells, showing that the uniformity is excellent. The cell results have been externally verified. The CIGS process is described in detail, and material characterization methods show that the CIGS layer exhibits a linear grading in the [Ga]/([Ga]+[In]) ratio, with an average [Ga]/([Ga]+[In]) value of 0.45. Standard processes for CdS as well as Cd-free alternative buffer layers are evaluated, and descriptions of the baseline process for the preparation of all other steps in the Ångström Solar Center standard solar cell are given.
Keywords
II-VI semiconductors; buffer layers; cadmium compounds; copper compounds; gallium compounds; indium compounds; solar cells; ternary semiconductors; vacuum deposition; wide band gap semiconductors; CIGS-CdS; CIGS-Zn1-xSnxOy; buffer layer; coevaporation; conversion efficiency; inline single-stage process; minimodule; solar cells; Buffer layer; Cd-free; Cu(In,Ga)Se$_{2}$ $_{1-x}$ $_{x}$ $_{y}$
fLanguage
English
Journal_Title
Photovoltaics, IEEE Journal of
Publisher
ieee
ISSN
2156-3381
Type
jour
DOI
10.1109/JPHOTOV.2013.2256232
Filename
6504703
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