Density profiles in sputtered molybdenum thin films and their effects on sodium diffusion in Cu(InxGa1-x)Se2 photovoltaics
Subtitle: preprint
By: Jian Li ... [et al.].
Contributors: National Renewable Energy Laboratory (U.S.); IEEE Photovoltaic Specialists Conference (37th : 2011 : Seattle, Wash.)
Series: NREL/CP -- 5200-50701; Conference paper (National Renewable Energy Laboratory (U.S.)) -- NREL/CP-5200-50701.
Publisher: National Renewable Energy Laboratory
Published: 2011
Place of publication: Golden, CO]
Language: eng
Format: [electronic resource] :
Subjects: Photovoltaic cells; Research; Solar cells; Design and construction; Thin films
Description: Molybdenum (Mo) thin films were sputtered onto soda lime glass (SLG) substrates. The main variable in the deposition parameters, the argon (Ar) pressure pAr, was varied in the range of 6 - 20 mTorr. Ex situ spectroscopic ellipsometry (SE) was performed to find out that the dielectric functions of the Mo films were strongly dependent on pAr, indicating a consistent and significant decrease in the Mo film density pMo with increasing pAr. This trend was confirmed by high-angle-annular-dark-field scanning transmission electron microscopy. Dielectric functions of Mo were then found to be correlated with secondary ion mass spectroscopy profiles of Sodium (Na) in the Cu(InxGa1-x)Se2 (CIGS) layer grown on top of Mo/SLG. Therefore, in situ optical diagnostics can be applied for process monitoring and optimization in the deposition of Mo for CIGS solar cells. Such capability is demonstrated with simulated optical transmission and reflectance of variously polarized incident light, using dielectric functions deduced from SE.
Notes: Title from title screen (viewed August 1, 2011).

"July 2011."

"Presented at the 37th IEEE Photovoltaic Specialists Conference (PVSC 37), Seattle, Washington, June 19-24, 2011."

Includes bibliographical references (p. 4).

DE-AC36-08GO28308

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