"Spatially controlled doping of two-dimensional SnS2 through intercalation for electronics"

Yongji Gong: Hongtao Yuan, Chun-Lan Wu, Peizhe Tang, Shi-Ze Yang, Ankun Yang, Guodong Li, Bofei Liu, Jorik van de Groep, Mark L. Brongersma, Matthew F. Chisholm, Shou-Cheng Zhang, Wu Zhou & Yi Cui; Nature Nanotechnology, 02/26/18.

Additional Authors: Hongtao Yuan, Chun-Lan Wu, Peizhe Tang, Shi-Ze Yang, Ankun Yang, Guodong Li, Bofei Liu, Jorik van de Groep, Mark L. Brongersma, Matthew F. Chisholm, Shou-Cheng Zhang, Wu Zhou & Yi Cui

Abstract:

Doped semiconductors are the most important building elements for modern electronic devices1. In silicon-based integrated circuits, facile and controllable fabrication and integration of these materials can be realized without introducing a high-resistance interface2,3. Besides, the emergence of two-dimensional (2D) materials enables the realization of atomically thin integrated circuits4,5,6,7,8,9. However, the 2D nature of these materials precludes the use of traditional ion implantation techniques for carrier doping and further hinders device development10. Here, we demonstrate a solvent-based intercalation method to achieve p-type, n-type and degenerately doped semiconductors in the same parent material at the atomically thin limit. In contrast to naturally grown n-type S-vacancy SnS2, Cu intercalated bilayer SnS2 obtained by this technique displays a hole field-effect mobility of ~40 cm2 V−1 s−1, and the obtained Co-SnS2 exhibits a metal-like behaviour with sheet resistance comparable to that of few-layer graphene5. Combining this intercalation technique with lithography, an atomically seamless p–n–metal junction could be further realized with precise size and spatial control, which makes in-plane heterostructures practically applicable for integrated devices and other 2D materials. Therefore, the presented intercalation method can open a new avenue connecting the previously disparate worlds of integrated circuits and atomically thin materials.