Molecular Van Der Waals Heterojunction Photodiodes Enabling Dipole-Induced Polarity Switching

Jaeho Shin, Seunghoon Yang, Jung Sun Eo, Takgyeong Jeon, Jaeho Lee, Chul Ho Lee, Gunuk Wang

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number2200646
JournalSmall Methods
Issue number10
Publication statusPublished - 2022 Oct 20


  • molecular self-assembled monolayers
  • solid-state devices
  • van der Waals heterojunctions

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)


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