Charge Transport in 2D DNA Tunnel Junction Diodes

M. Yoon, S.-W. Min, S.R. Dugasani, Y.U. Lee, M.S. Oh, T.D. Anthopoulos, S.H. Park, S. Im
Small, volume 13, issue 48, 1703006 , (2017)

Charge Transport in 2D DNA Tunnel Junction Diodes

Keywords

2D DNA crystals, Charge-transport mechanisms, Nanosheets, Semitransparent conducting oxide, Tunnel junction diodes

Abstract

​Recently, deoxyribonucleic acid (DNA) is studied for electronics due to its intrinsic benefits such as its natural plenitude, biodegradability, biofunctionality, and low-cost. However, its applications are limited to passive components because of inherent insulating properties. In this report, a metal–insulator–metal tunnel diode with Au/DNA/NiOx junctions is presented. Through the self-aligning process of DNA molecules, a 2D DNA nanosheet is synthesized and used as a tunneling barrier, and semitransparent conducting oxide (NiOx) is applied as a top electrode for resolving metal penetration issues. This molecular device successfully operates as a nonresonant tunneling diode, and temperature-variable current–voltage analysis proves that Fowler–Nordheim tunneling is a dominant conduction mechanism at the junctions. DNA-based tunneling devices appear to be promising prototypes for nanoelectronics using biomolecules.

Code

DOI: 10.1002/smll.201703006

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