Layered deposition of SnS2 grown by atomic layer deposition and its transport properties.

ABSTRACT

In this work, we report on the layered deposition of few-layer tin disulfide (SnS2) using atomic layer deposition (ALD). By varying the ALD cycles it was possible to deposit poly-crystalline SnS2 with small variation in layer numbers. Based on the ALD technique, we developed the process technology growing few-layer crystalline SnS2 film (3-6 layers) and we investigated their electrical properties by fabricating bottom-gated thin film transistors using the ALD SnS2 as the transport channel. SnS2 devices showed typical n-type characteristic with on/off current ratio of ∼8.32 × 106, threshold voltage of ∼2 V, and a subthreshold swing value of 830 mV decade-1 for the 6 layers SnS2. The developed SnS2 ALD technique may aid the realization of two-dimensional SnS2 based flexible and wearable devices.