2D semiconductor SnP2S6 as a new dielectric material for 2D electronics

Abstract

Due to the intriguing optical and electronic properties, 2D materials are promising for next generation optoelectrinc and electric device applications. Discovering new 2D materials with novel physical properties are rewarding for this area. In this work, we systematically investigated the optoelectronic properties of 2D metal thiophosphate SnP2S6 with unique nanoporous structure. The intermediate bandgap makes SnP2S6 a good candidate as bothe the channel and gate dielectric materials in the transistor device. SnP2S6 showed good photoresponse properties. In addition, the MoS2 transistor with SnP2S6 as dielectric layer shows a high dielectric constant( ≈23), low subthreshold slope down to 69.4 mV/dec, and it presented a 0.1 pA scale leakage current, a threshold voltage as low as 1.1 V, a ON/OFF ratio reaching 107 and negligible hysteresis with high stability and reproducibility. This work would open up new avenues for the discovery of new metal thiophosphate systems for future device applications.