Langmuir-Blodgett organic films deposition for the formation of conformal 2D inorganic-organic heterostructures

Michal Khenkin, Pranab K. Mohapatra, Boris Kaziev, Avinash Patsha, Daniel Beitner, Pini Shekhter, Assael Cohen, Debopriya Dutta, Mukundakumar Balasubrahmaniyam, Adina Golombek, Elad Koren, Tal Schwartz, Shachar Richter, Ariel Ismach

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Abstract

2D inorganic materials offer the opportunity to design and build heterostructures with unprecedented atomic control down to a monolayer. Integrating inorganic 2D layered materials, with the unlimited variety of organic molecules, provides a good platform for basic research and the formation of functional 2D organic-inorganic heterostructures, with tailored optoelectronic properties. In this work, we propose to employ a Langmuir-Blodgett (LB) monolayer deposition technique for the large-scale assembly of 2D inorganic-organic heterostructures. First, the transition-metal dichalcogenide monolayers (TMDCs), MoS2 and WSe2, are grown by a chemical vapor deposition (CVD)-based method. This is followed by the LB deposition of a monolayer(s) of Zn(II)-5-(4-aminophenyl)-10,15,20-(triphenyl)porphyrin (Zn-TPP(1f)). The morphology, optical and electrical properties were systematically studied for the two TMDC systems. Despite the similarities between both TMDCs, their heterostructures with Zn-TPP(1f) monolayers show a very different optical response; a strong quenching of the photoluminescence intensity is measured for the Zn-TPP(1f)/MoS2 system, an opposite trend, PL enhancement, is obtained for the WSe2 based heterostructure. These results are explained by the differences within their electronic band diagrams, as elucidated using a wide variety of spectroscopic methodologies. The orthogonal impact on the PL emission may serve as a general platform for the formation of 2D organic-inorganic heterostructures, with controlled optical properties.

Original languageEnglish
Article number159587
JournalApplied Surface Science
Volume655
DOIs
StatePublished - 15 May 2024

Funding

FundersFunder number
Israel Science Foundation2549/17, 2596/21, 2171/17
Israel Science Foundation

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