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Proceedings Paper

Variations in damp heat-induced degradation behavior of sputtered ZnO window layer for CIGS solar cells
Author(s): F. J. Pern; B. To; S. H. Glick; R. Sundaramoorthy; C. DeHart; S. Glynn; C. Perkins; L. Mansfield; T. Gessert
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Paper Abstract

This paper presents our recent observations on variations in properties and damp heat (DH)-induced degradation behavior for single-layer 2%Al-doped ZnO (AZO) and bilayer ZnO (BZO), which comprises 0.1-μm intrinsic ZnO (i-ZnO) and AZO, deposited on glass substrates using the same sputtering system and essentially identical deposition conditions. BZO films with 0.12-μm AZO have been used on the National Renewable Energy Laboratory's (NREL's) high-efficiency CuInGaSe2 (CIGS) solar cells for years. For the as-deposited BZO films, the most apparent variations appeared in notable peak shift in transmittance and reflectance spectra and ZnO (002) peak intensity and peak position in X-ray diffraction. Location of substrates placed on the substrate holder platform contributed partly to the variations. For the DH-degraded AZO and BZO, earlier films became highly resistive, porous, and 10~20 X thicker and showed flattened transmittance spectra caused by a loss of free-carrier absorption. However, recent DH-exposed AZO and BZO films also became highly resistive but exhibited only small changes in transmittance spectra, while the columnar grain structure and film thickness remained nearly unchanged without porous features, but with granular particles formed on the surfaces that increased in size with lengthening DH exposure time.

Paper Details

Date Published: 19 August 2010
PDF: 12 pages
Proc. SPIE 7773, Reliability of Photovoltaic Cells, Modules, Components, and Systems III, 77730R (19 August 2010); doi: 10.1117/12.863078
Show Author Affiliations
F. J. Pern, National Renewable Energy Lab. (United States)
B. To, National Renewable Energy Lab. (United States)
S. H. Glick, National Renewable Energy Lab. (United States)
R. Sundaramoorthy, National Renewable Energy Lab. (United States)
C. DeHart, National Renewable Energy Lab. (United States)
S. Glynn, National Renewable Energy Lab. (United States)
C. Perkins, National Renewable Energy Lab. (United States)
L. Mansfield, National Renewable Energy Lab. (United States)
T. Gessert, National Renewable Energy Lab. (United States)


Published in SPIE Proceedings Vol. 7773:
Reliability of Photovoltaic Cells, Modules, Components, and Systems III
Neelkanth G. Dhere; John H. Wohlgemuth; Kevin Lynn, Editor(s)

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