Direct Synthesis of a Self-Assembled WSe2/MoS2 Heterostructure Array and its Optoelectrical Properties

Jae Bok Lee, Yi Rang Lim, Ajit K. Katiyar, Wooseok Song, Jongsun Lim, Sukang Bae, Tae Wook Kim, Seoung Ki Lee, Jong Hyun Ahn

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


Functional van der Waals heterojunctions of transition metal dichalcogenides are emerging as a potential candidate for the basis of next-generation logic devices and optoelectronics. However, the complexity of synthesis processes so far has delayed the successful integration of the heterostructure device array within a large scale, which is necessary for practical applications. Here, a direct synthesis method is introduced to fabricate an array of self-assembled WSe2/MoS2 heterostructures through facile solution-based directional precipitation. By manipulating the internal convection flow (i.e., Marangoni flow) of the solution, the WSe2 wires are selectively stacked over the MoS2 wires at a specific angle, which enables the formation of parallel- and cross-aligned heterostructures. The realized WSe2/MoS2-based p–n heterojunction shows not only high rectification (ideality factor: 1.18) but also promising optoelectrical properties with a high responsivity of 5.39 A W−1 and response speed of 16 µs. As a feasible application, a WSe2/MoS2-based photodiode array (10 × 10) is demonstrated, which proves that the photosensing system can detect the position and intensity of an external light source. The solution-based growth of hierarchical structures with various alignments could offer a method for the further development of large-area electronic and optoelectronic applications.

Original languageEnglish
Article number1904194
JournalAdvanced Materials
Issue number43
Publication statusPublished - 2019 Oct 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF-2015R1A3A2066337), and the Korea Institute of Science and Technology (KIST) institutional program.

Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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