Tunable rectification in a molecular heterojunction with two-dimensional semiconductors

Jaeho Shin; Seunghoon Yang; Yeonsik Jang; Jung Sun Eo; Tae Wook Kim; Takhee Lee; Chul Ho Lee; Gunuk Wang

doi:10.1038/s41467-020-15144-9

Tunable rectification in a molecular heterojunction with two-dimensional semiconductors

Jaeho Shin, Seunghoon Yang, Yeonsik Jang, Jung Sun Eo, Tae Wook Kim, Takhee Lee, Chul Ho Lee, Gunuk Wang

KU-KIST Graduate School of Converging Science and Technology

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Until now, a specifically designed functional molecular species has been recognized as an absolute necessity for realizing the diode’s behavior in molecular electronic junctions. Here, we suggest a facile approach for the implementation of a tailored diode in a molecular junction based on non-functionalized alkyl and conjugated molecular monolayers. A two-dimensional semiconductor (MoS₂ and WSe₂) is used as a rectifying designer at the alkyl or conjugated molecule/Au interface. From the adjustment of band alignment at molecules/two-dimensional semiconductor interface that can activate different transport pathways depending on the voltage polarity, the rectifying characteristics can be implemented and controlled. The rectification ratio could be widely tuned from 1.24 to 1.83 × 10⁴ by changing the molecular species and type and the number of layers of the two-dimensional semiconductors in the heterostructure molecular junction. Our work sets a design rule for implementing tailored-diode function in a molecular heterojunction structure with non-functionalized molecular systems.

Original language	English
Article number	1412
Journal	Nature communications
Volume	11
Issue number	1
DOIs	https://doi.org/10.1038/s41467-020-15144-9
Publication status	Published - 2020 Dec 1

ASJC Scopus subject areas

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
Physics and Astronomy(all)

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title = "Tunable rectification in a molecular heterojunction with two-dimensional semiconductors",

abstract = "Until now, a specifically designed functional molecular species has been recognized as an absolute necessity for realizing the diode{\textquoteright}s behavior in molecular electronic junctions. Here, we suggest a facile approach for the implementation of a tailored diode in a molecular junction based on non-functionalized alkyl and conjugated molecular monolayers. A two-dimensional semiconductor (MoS2 and WSe2) is used as a rectifying designer at the alkyl or conjugated molecule/Au interface. From the adjustment of band alignment at molecules/two-dimensional semiconductor interface that can activate different transport pathways depending on the voltage polarity, the rectifying characteristics can be implemented and controlled. The rectification ratio could be widely tuned from 1.24 to 1.83 × 104 by changing the molecular species and type and the number of layers of the two-dimensional semiconductors in the heterostructure molecular junction. Our work sets a design rule for implementing tailored-diode function in a molecular heterojunction structure with non-functionalized molecular systems.",

author = "Jaeho Shin and Seunghoon Yang and Yeonsik Jang and Eo, {Jung Sun} and Kim, {Tae Wook} and Takhee Lee and Lee, {Chul Ho} and Gunuk Wang",

note = "Funding Information: This work was accomplished with financial support from the National Research Foundation of Korea (grant no. NRF-2019R1A2C2003704 and 2017R1A5A1014862 (SRC Program: vdWMRC Center)), Korea University Grant, KU-KIST Research Fund, and Korea TORAY Science Foundation. Y.J. and T.L. thank the financial support from the National Creative Research Laboratory program (grant no. 2012026372). Publisher Copyright: {\textcopyright} 2020, The Author(s).",

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AU - Kim, Tae Wook

AU - Lee, Takhee

AU - Lee, Chul Ho

AU - Wang, Gunuk

N1 - Funding Information: This work was accomplished with financial support from the National Research Foundation of Korea (grant no. NRF-2019R1A2C2003704 and 2017R1A5A1014862 (SRC Program: vdWMRC Center)), Korea University Grant, KU-KIST Research Fund, and Korea TORAY Science Foundation. Y.J. and T.L. thank the financial support from the National Creative Research Laboratory program (grant no. 2012026372). Publisher Copyright: © 2020, The Author(s).

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N2 - Until now, a specifically designed functional molecular species has been recognized as an absolute necessity for realizing the diode’s behavior in molecular electronic junctions. Here, we suggest a facile approach for the implementation of a tailored diode in a molecular junction based on non-functionalized alkyl and conjugated molecular monolayers. A two-dimensional semiconductor (MoS2 and WSe2) is used as a rectifying designer at the alkyl or conjugated molecule/Au interface. From the adjustment of band alignment at molecules/two-dimensional semiconductor interface that can activate different transport pathways depending on the voltage polarity, the rectifying characteristics can be implemented and controlled. The rectification ratio could be widely tuned from 1.24 to 1.83 × 104 by changing the molecular species and type and the number of layers of the two-dimensional semiconductors in the heterostructure molecular junction. Our work sets a design rule for implementing tailored-diode function in a molecular heterojunction structure with non-functionalized molecular systems.

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Tunable rectification in a molecular heterojunction with two-dimensional semiconductors

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