Lateral heterostructures of 2D transition metal dichalcogenide offer a powerful platform to investigate photonic and electronic phenomena at atomically sharp interfaces. However, their controlled engineering, including tuning lateral domain size and integration into vertical van der Waals heterostructures with other 2D materials, remains challenging. Here, we present a facile route for the synthesis of two types of heterostructures consisting of monolayers of MoSe2 and WSe2 - purely lateral (HS I) and hybrid lateral/vertical (HS II) - using liquid precursors of transition metal salts and chemical vapor deposition (CVD). Depending on the growth parameters, the heterostructure type and their lateral dimensions can be adjusted. We characterized properties of the HS I and HS II by complementary spectroscopic and microscopic techniques including Raman and photoluminescence spectroscopy, and optical and atomic force microscopy, and scanning electron and transmission electron microscopy. The photoluminescence measurements reveal strong interlayer exciton emission in the MoSe2/WSe2 region of HS II, which dominates the spectrum at 4 K and persisting up to room temperature. These results demonstrate high optical quality of the grown heterostructures which in combination with scalability of the developed approach paves the way for fundamental studies and device applications based on these unique 2D quantum materials.
@article{arxiv.2602.02871,
title = {CVD Grown Hybrid MoSe$_2$-WSe$_2$ Lateral/Vertical Heterostructures with Strong Interlayer Exciton Emission},
author = {Md Tarik Hossain and Sai Shradha and Axel Printschler and Julian Picker and Luc F. Oswald and Julian Fuehrer and Nicole Engel and Honey J. Shah and Christof Neumann and Daria I. Markina and Moritz Quincke and Johannes Biskupek and Kenji Watanabe and Takashi Taniguchi and Ute Kaiser and Bernhard Urbaszek and Andrey Turchanin},
journal= {arXiv preprint arXiv:2602.02871},
year = {2026}
}