Cu(In,Ga)Se2 (CIGS) thin film solar cells require appropriate Na doping and Ga concentration depth gradients to attain world record photovoltaic energy conversion. Na is known to hinder In/Ga interdiffusion in polycrystalline CIGS films, so these two strategies are interdependent. Firstly, this paper provides a review of Na doping and Ga depth gradients in CIGS, focusing on the currently accepted fact that Na hampers Ga diffusion. Secondly, such a view is challenged by newly published findings [1] showing that Na enhances In/Ga interdiffusion in monocrystalline CIGS films.
The Fox and the Hound - Na Doping and Ga Gradients in CIGS
Diego Colombara
2018-01-01
Abstract
Cu(In,Ga)Se2 (CIGS) thin film solar cells require appropriate Na doping and Ga concentration depth gradients to attain world record photovoltaic energy conversion. Na is known to hinder In/Ga interdiffusion in polycrystalline CIGS films, so these two strategies are interdependent. Firstly, this paper provides a review of Na doping and Ga depth gradients in CIGS, focusing on the currently accepted fact that Na hampers Ga diffusion. Secondly, such a view is challenged by newly published findings [1] showing that Na enhances In/Ga interdiffusion in monocrystalline CIGS films.
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