2D transition-metal dichalcogenides have been reported to possess piezoelectricity due to their lack of inversion symmetry; thus, they are potentially applicable as electromechanical energy harvesters. Herein, the authors propose a lithography-free piezoelectric energy harvester composed of centimeter-scale MoS2 monolayer films with an interdigitated electrode pattern that is enabled only by the large scale of the film. High-quality large-scale synthesis of the monolayer films is conducted by low-pressure chemical vapor deposition with the assistance of an unprecedented Na2S promoter. The extra sulfur supplied by Na2S critically passivates the sulfur vacancies. The energy harvester having a large active area of ≈18.3 mm2 demonstrates an unexpectedly high piezoelectric energy harvesting performance of ≈400.4 mV and ≈40.7 nA under a bending strain of 0.57%, with the careful adjustment of side electrodes along the zigzag atomic arrays in the two dominant domain structure. Nanoampere-level harvesting has not yet been reported with any 2D material-based harvester.
|Publication status||Published - 2022 Jun 16|
Bibliographical noteFunding Information:
This work was financially supported by grants from the National Research Foundation of Korea (NRF-2021R1A2C2013501 and NRF-2020M3D1A2102913) and the Creative Materials Discovery Program of the Ministry of Science and ICT (2018M3D1A1058536).
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All Science Journal Classification (ASJC) codes
- Materials Science(all)