High-responsivity PtSe2photodetector enhanced by photogating effect

Yajie Yang, Jinshu Li, Seunghyuk Choi, Sumin Jeon, Jeong Ho Cho, Byoung Hun Lee, Sungjoo Lee

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Platinum diselenide (PtSe2), a recently rediscovered two-dimensional transition metal dichalcogenide, has attracted immense attention in the optoelectronic field due to its tunable bandgap, ultrastability, and high electron mobility. However, the applications of PtSe2 photodetectors are seriously restricted by their low responsivity. In this work, a high-responsivity (5 × 104 A/W) PtSe2 photodetector is obtained by exploiting a photogating effect; this is induced by the hole-trapping states, which are attributed to Se vacancies. Moreover, a gate-tunable transition between the positive and negative photoconductances is observed under light illumination. A theoretical calculation based on the Boltzmann transport theory is performed to explain the carrier transport of PtSe2, considering the contributions of charged impurity, acoustic phonon, and polar optical phonon scattering.

Original languageEnglish
Article number013103
JournalApplied Physics Letters
Issue number1
Publication statusPublished - 2021 Jan 4

Bibliographical note

Publisher Copyright:
© 2021 Author(s).

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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