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Is screening length in tunneling probability equation actually the tunneling barrier length?

Drain current of a TFET is proportioned to tunneling probability Tt. As it can be seen from the picture, Λ is screening length. my question is that can we call Λ, "tunneling barrier length/width" or not? there is a lot of names for Λ, however non of them is barrier length. 

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    Antonia Cummins

    In the traditional work on screening of atomic responses for astrophysical applications the  Cheapdemonstrate was utilized for feeble screening, with various revisions for electron decline and so forth. Later works, including [11], treated solid screening and furthermore centered around various densities and temperatures

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