Multilevel conductivity and conductance switching in supramolecular structures of an organic molecule

We have demonstrated conductance switching between multilevel states in devices based on Rose Bengal molecules embedded in supramolecular matrices. Two mechanisms, namely electroreduction and conformational change of the molecules, resulting in conjugation modification have been proposed to be applicable in these devices. In a low voltage region, reverse-bias induced electroreduction of Rose Bengal facilitated conjugation restoration in the backbone of the molecule and, hence, switching to a high-conducting state. At high biases, the two perpendicular planes present in Rose Bengal, which have permanent dipole moments, allowed forward-bias induced conformation change to occur, and results in conductance switching. We have demonstrated how the devices can switch between two pair of conducting states for random-access memory and read-only memory applications for several hours.

[1]  Richard S. Potember,et al.  Electrical switching and memory phenomena in Cu‐TCNQ thin films , 1979 .

[2]  F. Raymo.  Digital processing and communication with molecular switches , 2002 .

[3]  Anirban Bandyopadhyay,et al.  Large conductance switching and memory effects in organic molecules for data-storage applications , 2003 .

[4]  Jonathan S. Lindsey,et al.  Electrical characterization of redox-active molecular monolayers on SiO2 for memory applications , 2003 .

[5]  Chen,et al.  Large On-Off Ratios and Negative Differential Resistance in a Molecular Electronic Device. , 1999, Science.

[6]  Dongge Ma,et al.  Organic Reversible Switching Devices for Memory Applications , 2000 .

[7]  David J. Schiffrin,et al.  A nanometre-scale electronic switch consisting of a metal cluster and redox-addressable groups , 2000, Nature.

[8]  A. Solak,et al.  A mechanism for conductance switching in carbon-based molecular electronic junctions , 2002 .

[9]  Kevin F. Kelly,et al.  Matrix-Mediated Control of Stochastic Single Molecule Conductance Switching , 2002 .

[10]  R Lloyd Carroll,et al.  The genesis of molecular electronics. , 2002, Angewandte Chemie.

[11]  Michael F. Rubner,et al.  pH-Dependent Thickness Behavior of Sequentially Adsorbed Layers of Weak Polyelectrolytes , 2000 .

[12]  A. Pal,et al.  Large conductance switching and binary operation in organic devices: Role of functional groups , 2003 .

[13]  Liping Ma,et al.  Organic bistable light-emitting devices , 2002 .

[14]  D. Chemla,et al.  Hindered Rotational Diffusion and Rotational Jumps of Single Molecules , 1998 .

[15]  Liping Ma,et al.  Organic electrical bistable devices and rewritable memory cells , 2002 .

[16]  C. Gerber,et al.  Reproducible switching effect in thin oxide films for memory applications , 2000 .