Ambipolar Channel p-TMD/n-Ga2O3 Junction Field Effect Transistors and High Speed Photo-sensing in TMD Channel

Wonjun Choi, Jongtae Ahn, Ki Tae Kim, Hye Jin Jin, Sungjae Hong, Do Kyung Hwang, Seongil Im

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Highly crystalline 2D/3D-mixed p-transition metal dichalcogenide (TMD)/n-Ga2O3 heterojunction devices are fabricated by mechanical exfoliation of each p- and n-type material. N-type β-Ga2O3 and p-type TMD separately play as a channel for junction field effect transistors (JFETs) with each type of carriers as well as materials for a heterojunction PN diode. The work thus mainly focuses on such ambipolar channel transistors with two different types of channel in a single device architecture. For more extended applications, the transparency of high energy band gap β-Ga2O3 (Eg ≈ 4.8 eV) is taken advantage of, firstly to measure the electrical energy gap of p-TMDs receiving visible or near infrared (NIR) photons through the β-Ga2O3. Next, the p-TMD/n-Ga2O3 JFETs are put to high speed photo-sensing which is achieved from the p-TMD channel under reverse bias voltages on n-Ga2O3. The photo-switching cutoff frequency appears to be ≈16 and 29 kHz for visible red and NIR illuminations, respectively, on the basis of −3 dB photoelectric power loss. Such a high switching speed of the JFET is attributed to the fast transport of photo-carriers in TMD channels. The 2D/3D-mixed ambipolar channel JFETs and their photo-sensing applications are regarded novel, promising, and practically easy to achieve.

Original languageEnglish
Article number2103079
JournalAdvanced Materials
Issue number38
Publication statusPublished - 2021 Sept 23

Bibliographical note

Funding Information:
W.C. and J.A. contributed equally to this work. The authors acknowledge the financial support from National Research Foundation of Korea (SRC program vdWMRC: Grant No.2017R1A5A1014862). This work was partially supported by Yonsei Signature Research Cluster Program of 2021.

Publisher Copyright:
© 2021 Wiley-VCH GmbH.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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