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 () and Gunuk Wang ()
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Jaeho Shin: Korea University
Seunghoon Yang: Korea University
Yeonsik Jang: Seoul National University
Jung Sun Eo: Korea University
Tae-Wook Kim: Jeonbuk National University
Takhee Lee: Seoul National University
Chul-Ho Lee: Korea University
Gunuk Wang: Korea University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-15144-9

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