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Chilin Li, Xiangxin Guo, Lin Gu, Dominik Samuelis and Joachim Maier Ionic Space-Charge Depletion in Lithium Fluoride Thin Films on Sapphire (0001) Substrates Advanced Functional Materials 21

Article first published online: 30 MAY 2011 | DOI: 10.1002/adfm.201100303

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Thickness-dependent measurements of lithium fluoride thin films grown on c-plane sapphire substrates allow the separation of bulk and interface conductions. The normalized conductance decreases linearly with decreasing LiF layer thickness with a negative extrapolated intercept. It indicates depletion of lithium ion vacancies as majority charge carriers and hence a negative space-charge potential. A generalized Mott–Schottky approach within the model of heterogeneous doping fully explains the entire boundary defect chemistry.

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