Photocurrent generation at ABA/ABC lateral junction in tri-layer graphene photodetector

Minjung Kim, Seon Myeong Choi, Ho Ang Yoon, Sun Keun Choi, Jae Ung Lee, Jungcheol Kim, Sang Wook Lee, Young Woo Son, Hyeonsik Cheong

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Metal-graphene-metal photodetectors utilize photocurrent generated near the graphene/metal junctions and have many advantages including high speed and broad-band operation. Here, we report on photocurrent generation at ABA/ABC stacking domain junctions in tri-layer graphene with a responsivity of 0.18 A/W. Unlike usual metal-graphene-metal devices, the photocurrent is generated in the middle of the graphene channel, not confined to the vicinity of the metal electrodes. The magnitude and the direction of the photocurrent depend on the back-gate bias. Theoretical calculations show that there is a built-in band offset between the two stacking domains, and the dominant mechanism of the photocurrent is the photo-thermoelectric effect due to the Seebeck coefficient difference.

Original languageEnglish
Pages (from-to)454-458
Number of pages5
JournalCarbon
Volume96
DOIs
StatePublished - Jan 2016

Bibliographical note

Publisher Copyright:
© 2015 Elsevier Ltd.

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