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Photoresponse of Stacked, Multilayer MoS2 Films Assembled from Solution-Processed MoS2 Flakes

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Issue Date
2021-03
Citation
Acs Applied Nano Materials, Vol.4 No.3, pp.3087-3094
Keywords
transition metal dichalcogenide;chemically exfoliated MoS2;surface chemistry;functionalization;thin film fabrication;photoresponsivity
Abstract
Taking a solution-based approach to obtain transition metal dichalcogenide monolayers affords a number of advantages, including processing that is scalable, cost effective, and enables tuning monolayer functionality through solution chemistry. MoS2 flakes down to monolayers prepared using such an approach have demonstrated improved photoluminescence and tuned solubility. Developing methods for assembling such MoS2 flakes from solution to fashion integrated, heterostructure devices provides opportunities for exploring and potentially applying these materials. In this study, we describe a simple method for stacking two-dimensional network films (2DFs) layer-by-layer on different substrates by first depositing a 2DF on an alumina membrane, transferring the 2DF to a gel film, and dry transferring to the desired substrate. The method allows control over chemical nature, shape, and position of each layer in the stacked, multilayer 2DF. The present study shows that stacked multilayers exhibit increased electrical conductivity with increasing number of layers and photoconductivity upon illumination using a white LED. Combined with ionic liquid gating, 2DFs exhibit a photoresponsivity of 36 mA/W, more than two orders higher than previously reported using a device based on MoS2 prepared in solution. Given its scalability and facility for device fabrication, this approach opens a diversity of applications for solution-based 2D materials.
ISSN
2574-0970
URI
https://hdl.handle.net/10371/178066
DOI
https://doi.org/10.1021/acsanm.1c00264
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