In-Plane Mosaic Potential Growth of Large-Area 2D Layered Semiconductors MoS2–MoSe2 Lateral Heterostructures and Photodetector Application

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• 作者：Xiaoshuang Chen ; Yunfeng Qiu ; Huihui Yang ; Guangbo Liu ; Wei Zheng ; Wei Feng ; Wenwu Cao ; Wenping Hu ; PingAn Hu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：January 18, 2017
• 年：2017
• 卷：9
• 期：2
• 页码：1684-1691
• 全文大小：531K
• ISSN：1944-8252

文摘

Considering the unique layered structure and novel optoelectronic properties of individual MoS<sub>2sub> and MoSe<sub>2sub>, as well as the quantum coherence or donor–acceptor coupling effects between these two components, rational design and artificial growth of in-plane mosaic MoS<sub>2sub>/MoSe<sub>2sub> lateral heterojunctions film on conventional amorphous SiO<sub>2sub>/Si substrate are in high demand. In this article, large-area, uniform, high-quality mosaic MoS<sub>2sub>/MoSe<sub>2sub> lateral heterojunctions film was successfully grown on SiO<sub>2sub>/Si substrate for the first time by chemical vapor deposition (CVD) technique. MoSe<sub>2sub> film was grown along MoS<sub>2sub> triangle edges and occupied the blanks of the substrate, finally leading to the formation of mosaic MoS<sub>2sub>/MoSe<sub>2sub> lateral heterojunctions film. The composition and microstructure of mosaic MoS<sub>2sub>/MoSe<sub>2sub> lateral heterojunctions film were characterized by various analytic techniques. Photodetectors based on mosaic MoS<sub>2sub>/MoSe<sub>2sub> lateral heterojunctions film, triangular MoS<sub>2sub> monolayer, and multilayer MoSe<sub>2sub> film are systematically investigated. The mosaic MoS<sub>2sub>/MoSe<sub>2sub> lateral heterojunctions film photodetector exhibited optimal photoresponse performance, giving rise to responsivity, detectivity, and external quantum efficiency (EQE) up to 1.3 A W<sup>–1sup>, 2.6 × 10<sup>11sup> Jones, and 263.1%, respectively, under the bias voltage of 5 V with 0.29 mW cm<sup>–2sup> (610 nm), possibly due to the matched band alignment of MoS<sub>2sub> and MoSe<sub>2sub> and strong donor–acceptor delocalization effect between them. Taking into account the similar edge conditions of transition metal dichalcogenides (TMDCs), such a facile and reliable approach might open up a unique route for preparing other 2D mosaic lateral heterojunctions films in a manipulative manner. Furthermore, the mosaic lateral heterojunctions film like MoS<sub>2sub>/MoSe<sub>2sub> in the present work will be a promising candidate for optoelectronic fields.