Gallium depth gradients are crucial to attain suitable optoelectronic properties in Cu(In,Ga)Se2 (CIGS) thin films for photovoltaic energy conversion. In this respect, sodium is also essential, but it is known to hinder In/Ga interdiffusion in polycrystalline CIGS films. Firstly, this paper provides a review of the experimental and computational literature leading to the currently accepted rationale that sodium hampers gallium diffusion in CIGS. Secondly, such a justification is challenged by new findings showing that sodium appears to enhance In/Ga interdiffusion in monocrystalline Cu-poor CIS films on gallium arsenide.
Does Na hinder or enhance In-Ga interdiffusion in CIGS?
Colombara D;
2016-01-01
Abstract
Gallium depth gradients are crucial to attain suitable optoelectronic properties in Cu(In,Ga)Se2 (CIGS) thin films for photovoltaic energy conversion. In this respect, sodium is also essential, but it is known to hinder In/Ga interdiffusion in polycrystalline CIGS films. Firstly, this paper provides a review of the experimental and computational literature leading to the currently accepted rationale that sodium hampers gallium diffusion in CIGS. Secondly, such a justification is challenged by new findings showing that sodium appears to enhance In/Ga interdiffusion in monocrystalline Cu-poor CIS films on gallium arsenide.
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