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1T–TaS2 is a layered charge density wave (CDW) crystal exhibiting sharp phase transitions and associated resistance changes. These resistance steps could be exploited for information storage, underscoring the importance of controlling and tuning the CDW states. Given the importance of out-of-plane interactions in 1T–TaS2, modulating interlayer interactions by heterostructuring is a promising method for tailoring CDW phase transitions. In this work, we investigate the optical and electronic properties of heterostructures comprising 1T–TaS2 and monolayer 1H–WSe2. By systematically varying the thickness of 1T–TaS2 and its azimuthal alignment with 1H–WSe2, we find that intrinsic moiré strain and interfacial charge transfer introduce CDW disorder in 1T–TaS2 and modify the CDW ordering temperature. Furthermore, our studies reveal that the interlayer alignment impacts the exciton dynamics in 1H–WSe2, indicating that heterostructuring can concurrently tailor the electronic phases in 1T–TaS2 and the optical properties of 1H–WSe2. This work presents a promising approach for engineering the optoelectronic behavior of heterostructures that integrate CDW materials and semiconductors.

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  This document is the Accepted Manuscript version of a Published Article that appeared in final form in ACS Nano, copyright © 2025 American Chemical Society. To access the final published article, see https://doi.org/10.1021/acsnano.5c06759.

Keyword: Charge density wave (CDW), TaS2, WSe2

Date published: 2025-09-16

Publisher: American Chemical Society (ACS)

Journal:

• ACS Nano (ISSN: 1936086X) vol. 19 issue. 36 p. 32218-32230

Funding:

• Engineering and Physical Sciences Research Council EP/T022108/1
• Engineering and Physical Sciences Research Council EP/W028131/1
• Ministry of Education, Culture, Sports, Science and Technology
• Basic Energy Sciences DE-AC02-05CH11231
• Core Research for Evolutional Science and Technology JPMJCR24A5
• Arnold and Mabel Beckman Foundation
• Blavatnik Family Foundation
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052
• U.S. Department of Defense N00014-20-1-2599
• National Science Foundation 2238196
• HEC Materials Chemistry Consortium
• HPC Midlands+ consortium

Manuscript type: Author's version (Accepted manuscript)

MDR DOI:

First published URL: https://doi.org/10.1021/acsnano.5c06759

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Updated at: 2026-07-29 11:00:08 +0900

Published on MDR: 2026-09-01 08:25:52 +0900