Work

Negative Differential Resistance in a Gated SnS 2 /Ge Heterojunction Tunnel Diode with a High Peak-to-Valley Current Ratio of 4.7

Year: 2026

Type: article

Abstract: 2D/3D heterojunction tunnel transistors are promising for low-power logic applications owing to their steep subthreshold swing. Moreover, a broken-gap heterojunction is essential to enhance the current in a tunnel device. However, there is rare experimental work of 2D/3D broken-gap heterojunctions with clear negative differential resistance (NDR) and gate-tunable tunneling characteristics. In this work, we demonstrate a top-gated SnS 2 /p + –Ge heterojunction tunnel diode with a broken-gap alignment, exhibiting unambiguous negative differential resistance and an exceptionally high peak-to-valley ratio (PVCR) of approximately 4.7, the highest reported among all 2D/3D heterojunction tunnel diodes. Our results clearly demonstrate gate tunability of band-to-band tunneling in a SnS 2 /p + –Ge heterojunction diode for advanced electronic applications.

Source: ACS Applied Electronic Materials

DOI: 10.1021/acsaelm.5c02497

Authors: Shih-Chieh Su, Rui-Jun Wu, Hsiang-Shun Kao, Jiun-Yun Li

Institution: National Taiwan University

Language: English

Topic: 2D Materials and Applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,500

Funder: National Science and Technology Council