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

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(a) Output characteristics at various V_G levels between 60 and −60 V, along steps of 10 V. Inset: output characteristics on the logarithmic scale in the current-on state. The ideality factor was estimated as 1.6. (b) The transfer characteristics and their photoresponses during both the forward and reverse sweeps. (c,d) Channel current mapping under dark conditions and the corresponding PC mapping as a function of various V_D (from −3 to 3 V) and V_G (from −60 to 60 V) levels illustrate the ambipolar carrier transport.