Interference effects in phtalocyanine controlled by H-H tautomerization: Potential two-terminal unimolecular electronic switch
Artikel i vetenskaplig tidskrift, 2011

We investigate the electrical transport properties of two hydrogen tautomer configurations of phthalocyanine (H(2)Pc) connected to cumulene and gold leads. Hydrogen tautomerization affects the electronic state of H(2)Pc by switching the character of molecular orbitals with the same symmetry close to the Fermi level. The near degeneracy between the HOMO and HOMO-1 leads to pronounced interference effects, causing a large change in current for the two tautomer configurations, especially in the low-bias regime. Two types of planar junctions are considered: cumulene-H(2)Pc-cumulene and gold-H(2)Pc-gold. Both demonstrate a prominent difference in molecular conductance between ON and OFF states. In addition, junctions with gold leads show pronounced negative differential resistance (NDR) at high bias voltage, as well as weak NDR at intermediate bias.

chain polymerization

architectures

conductance

single-molecule

transport

quantum-interference

devices

junctions

memory

Författare

J. Prasongkit

A. Grigoriev

R. Ahuja

Göran Wendin

Chalmers, Teknisk fysik, Elektronikmaterial och system

Physical Review B - Condensed Matter and Materials Physics

1098-0121 (ISSN)

Vol. 84 16

Ämneskategorier

Fysik

DOI

10.1103/PhysRevB.84.165437

Mer information

Skapat

2017-10-06