Modeling Diffusion of Impurities in Molybdenum Thin Films as a Function of Substrate Temperature

Journal Article · 05 December 2018 · IEEE Journal of Photovoltaics

DOI: https://doi.org/10.1109/jphotov.2018.2882211 · OSTI ID:2280853

Belfore, Benjamin  ^[1]; Ayala, Orlando  ^[2]; Ashrafee, Tasnuva ^[2]; Rajan, Grace  ^[2]; Karki, Shankar  ^[2]; Marsillac, Sylvain  ^[2]

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1. Old Dominion University, Norfolk, VA (United States); Colorado School of Mines
2. Old Dominion University, Norfolk, VA (United States)

Alkali ions are key to improving the performance of polycrystalline Cu(In,Ga)Se2 (CIGS) solar cells. Typically, a soda– lime glass substrate acts as an intrinsic source for many alkali ions. For these ions to reach the CIGS layer, diffusion through a metallic back contact is necessary. Typically deposited via sputtering, the morphology of this metallic back contact is dependent on multiple deposition parameters, including substrate temperature. By preparing films with varying deposition parameters, and utilizing both, multiple material characterizations (X-ray diffraction, scanning electron microscopy, and secondary ion mass spectrometry) and numerical modeling, we demonstrate here that effective paths of diffusion are just as important as diffusion rate for the alkali ions. As the substrate temperature increases, the mechanism that hinders the ability for alkali ions to diffuse switches effectively from diffusion rate to effective path of diffusion. Furthermore, it is shown that the lack of viable diffusion paths at substrate temperatures above 100 °C becomes the dominant factor for the transport of alkali ions.

• Research Organization: Colorado School of Mines, Golden, CO (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: EE0007551
• OSTI ID: 2280853
• Journal Information: IEEE Journal of Photovoltaics, Journal Name: IEEE Journal of Photovoltaics Journal Issue: 1 Vol. 9; ISSN 2156-3381
• Publisher: IEEECopyright Statement
• Country of Publication: United States
• Language: English