Realization of vertical metal semiconductor heterostructures via solution phase epitaxy

Xiaoshan Wang, Zhiwei Wang, Jindong Zhang, Xiang Wang, Zhipeng Zhang, Jialiang Wang, Zhaohua Zhu, Zhuoyao Li, Yao Liu, Xuefeng Hu, Junwen Qiu, Guohua Hu, Bo Chen, Ning Wang, Qiyuan He, Junze Chen, Jiaxu Yan, Wei Zhang, Tawfique Hasan, Shaozhou LiHai Li, Hua Zhang, Qiang Wang, Xiao Huang, Wei Huang

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

The creation of crystal phase heterostructures of transition metal chalcogenides, e.g., the 1T/2H heterostructures, has led to the formation of metal/semiconductor junctions with low potential barriers. Very differently, post-transition metal chalcogenides are semiconductors regardless of their phases. Herein, we report, based on experimental and simulation results, that alloying between 1T-SnS2and 1T-WS2induces a charge redistribution in Sn and W to realize metallic Sn0.5W0.5S2nanosheets. These nanosheets are epitaxially deposited on surfaces of semiconducting SnS2nanoplates to form vertical heterostructures. The ohmic-like contact formed at the Sn0.5W0.5S2/SnS2heterointerface affords rapid transport of charge carriers, and allows for the fabrication of fast photodetectors. Such facile charge transfer, combined with a high surface affinity for acetone molecules, further enables their use as highly selective 100 ppb level acetone sensors. Our work suggests that combining compositional and structural control in solution-phase epitaxy holds promises for solution-processible thin-film optoelectronics and sensors.

Original languageEnglish
Article number3611
JournalNature Communications
Volume9
Issue number1
DOIs
StatePublished - 1 Dec 2018

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