Transition metal dichalcogenide heterojunction PN diode toward ultimate photovoltaic benefits

Jongtae Ahn, Pyo Jin Jeon, Syed Raza Ali Raza, Atiye Pezeshki, Sung Wook Min, Do Kyung Hwang, Seongil Im

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


Recently, two-dimensional (2D) transition metal dichalcogenide (TMDC) semiconductors as van der Waals (vdW) materials have attracted much attention from researchers. Among many 2D TMDC materials, a few layer-thin molybdenum disulfide (MoS2) and tungsten diselenide (WSe2) have been most intensively studied respectively as 2D n- and p-type semiconductors. Here, we have fabricated vertical vdW heterojunction n-MoS2/p-WSe2 diode with a few tens nm-thick layers by using vertically-sandwiched ohmic terminals, so that no quasi neutral region may exist between two terminals. As a result, we obtained high photo responsivity at zero volt without any electric power, and it appears comparable to those of commercially-optimized SiPN diode. Photo-voltage output of 0.3 V was easily obtained from our vdWPN diode as open circuit voltage, and can be doubled up to 0.6 Vby using two PN diodes. These beneficial photovoltaic results from vdWPN diode were directly applied to PV switching dynamics and transistor photo gating, for the first time. We regard that our vdW n-MoS2/p-WSe2 heterojunction diode could maximize its photovoltaic energy benefits with optimized TMDC thicknesses.

Original languageEnglish
Article number045011
Journal2D Materials
Issue number4
Publication statusPublished - 2016 Oct 14

Bibliographical note

Publisher Copyright:
© 2016 IOP Publishing Ltd.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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