Epitaxial growth of a monolayer WSe2-MoS2 lateral p-n junction with an atomically sharp interface by Ming-Yang Li, Yumeng Shi, Chia-Chin Cheng, Li-Syuan.

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Epitaxial growth of a monolayer WSe2-MoS2 lateral p-n junction with an atomically sharp interface by Ming-Yang Li, Yumeng Shi, Chia-Chin Cheng, Li-Syuan Lu, Yung-Chang Lin, Hao-Lin Tang, Meng-Lin Tsai, Chih-Wei Chu, Kung-Hwa Wei, Jr-Hau He, Wen-Hao Chang, Kazu Suenaga, and Lain-Jong Li Science Volume 349(6247):524-528 July 31, 2015 Published by AAAS

Fig. 1 Formation and structure of WSe2-MoS2 heterostructures. Formation and structure of WSe2-MoS2 heterostructures. (A) Schematic illustration of the sequential growth of the monolayer WSe2-MoS2 in-plane heterostructure. (B) As shown in the optical image, the WSe2 and MoS2 can be distinguished by their optical contrast. (C and D) High-resolution STEM images taken from the WSe2-MoS2 in-plane heterostructure. (E) Atomic model showing the interface structure between WSe2 and MoS2. Ming-Yang Li et al. Science 2015;349:524-528 Published by AAAS

Fig. 2 Polarization-resolved SHG measurement. Polarization-resolved SHG measurement. (A) The intensity maps of the perpendicular IV and parallel IH components of the SH. The insert shows the optical image. The black double arrow line indicates the direction of incident laser polarization. (C and D) Maps of the total intensity Itotal and angle θ between the direction of laser polarization and the armchair direction of the sample, respectively. (B) The intensity maps of the IV and IH components of the SH for a multidomain WSe2-MoS2 junction. (E and F) Maps of the Itotal and θ of the area shown in (B). The scale bar for all is 5 μm. Ming-Yang Li et al. Science 2015;349:524-528 Published by AAAS

Fig. 3 Photoluminescence and Raman measurements. Photoluminescence and Raman measurements. (A) PL spectra of MoS2 and its corresponding spatial modulation as shown in the inset contour color map. (B) Spatial maps of the A1g and E2g peak position. (C) The extracted MoS2 Raman spectra from the WSe2-MoS2 junction, where the colored spectra corresponds to the inset contour color map in (A). (D and E) The maps showing PL intensity and the spatial modulation of photon energy for a selected heterojunction. (F) Spectra 1 to 9 were collected from the location marked in (D). Ming-Yang Li et al. Science 2015;349:524-528 Published by AAAS

Fig. 4 Electrical properties of the devices based on heterojunction. Electrical properties of the devices based on heterojunction. (A) SKPM image showing the surface potential distribution for the WSe2-MoS2 heterostructure. Inset shows the AFM height images, and no obvious height difference is observed from two sides of the junction. (B) Optical image for the WSe2-MoS2 p-n junction device. Scale bar, 4 μm. (C) Electrical transport curves (I versus V) with and without light exposure (1 mW/cm2), showing the presence of a p-n junction and photovoltaic effect. (D) Electrical transport curves for Ti-contacted MoS2 and Pd-contacted WSe2 separately. Ming-Yang Li et al. Science 2015;349:524-528 Published by AAAS