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. 2015 Mar 24;6:6564. doi: 10.1038/ncomms7564

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(a) The barrier height and DT–FNT transition voltage as functions of the MoS₂ thickness and layer number. (b) Current rectification ratio as a function of the MoS₂ thickness and layer number at various V_D (±3, ±2 and ±1 V) levels, indicating a transition between the conventional rectification and reversed rectification at ~8 nm (red dot circle).