Molecular Van Der Waals Heterojunction Photodiodes Enabling Dipole-Induced Polarity Switching
- Authors
- Shin, Jaeho; Yang, Seunghoon; Eo, Jung Sun; Jeon, Takgyeong; Lee, Jaeho; Lee, Chul-Ho; Wang, Gunuk
- Issue Date
- Oct-2022
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- molecular self-assembled monolayers; solid-state devices; van der Waals heterojunctions
- Citation
- SMALL METHODS, v.6, no.10
- Indexed
- SCIE
SCOPUS
- Journal Title
- SMALL METHODS
- Volume
- 6
- Number
- 10
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/144177
- DOI
- 10.1002/smtd.202200646
- ISSN
- 2366-9608
- Abstract
- Solid-state devices capable of controlling light-responsive charge transport at the molecular scale are essential for developing molecular optoelectronic technology. Here, a solid-state molecular photodiode device constructed by forming van der Waals (vdW) heterojunctions between standard molecular self-assembled monolayers and two-dimensional semiconductors such as WSe2 is reported. In particular, two non-functionalized molecular species used herein (i.e., tridecafluoro-1-octanethiol and 1-octanethiol) enable bidirectional modulation of the interface band alignment with WSe2, depending on their dipole orientations. This dipole-induced band modulation at the vdW heterointerface leads to the opposite change of both photoswitching polarity and rectifying characteristics. Furthermore, compared with other molecular or 2D photodiodes at a similar scale, these heterojunction devices exhibit significantly enhanced photo-responsive performances in terms of photocurrent magnitude, open-circuit potential, and switching speed. This study proposes a novel concept of the solid-state molecular optoelectronic device with controlled functions and enhanced performances.
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