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

Bandyopadhyay, Anirban; Pal, Amlan J.
February 2004
Applied Physics Letters;2/9/2004, Vol. 84 Issue 6, p999
Academic Journal
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. © 2004 American Institute of Physics.


Related Articles

  • Electrical bistability in a xanthene class molecule: Conduction mechanisms. Rath, Arup K.; Sahu, Satyajit; Pal, Amlan J. // Applied Physics Letters;10/2/2006, Vol. 89 Issue 14, p142110 

    The author study conduction mechanism in two conducting states of a bistable device at 10–300 K range. They find that in the electrical bistable devices, electrical switching is associated with a change in the conduction mechanism. Device current in the low-conducting state follows an...

  • New connection.  // Electronic News (10616624);9/4/95, Vol. 41 Issue 2081, p4 

    Predicts that Motorola will add a new member to its Neuron device family in 1995. The family implements Echelon Corp.'s LonWorks controller technology; Motorola's increased on-chip EEpROM to 2K; Random access memory.

  • Bonus Coverage RAM-ROM.  // Portable Design;Oct2003, Vol. 9 Issue 10, p39 

    Presents several random access memory (RAM) and read-only memory (ROM) devices and accessories. DiskOnChip-based multichip package from M-Systems; NAND/DRAM multichip-package from Samsung Electronics; Mobile-RAM from Infineon Technologies.

  • Audio DSPs recover lost memories. Dipert, Brian; Granville, Fran // EDN;11/25/2004, Vol. 49 Issue 24, p20 

    This article focuses on the 21367 and 21368 computer chips from Analog Devices. Smaller and cheaper packaging, along with an overdue embrace of internal read-only memory (ROM), were the key reasons that Analog Devices was able to migrate its SHARC audio DSP family into mainstream, cost-sensitive...

  • Microprocessors.  // EDN;11/25/2004, Vol. 49 Issue 24, p121 

    This article offers three microprocessors. The XC167CI-32F40F, XC161CS-32F40F, and XC164CS-32F40F 16-bit microcontrollers from Infineon Technologies AG offer an embedded flash-memory capacity of 256 kilobytes. They include a C166S V2 core with a 40-megahertz instruction time and an...

  • Hitting their stride. Dipert, Brian // EDN;1/20/2005, Vol. 50 Issue 2, p55 

    This section addresses several issues pertaining to the computer flash memory industry in the U.S. as of 2005. It's been more than 15 years since fast-random-access NOR flash memory's initial public unveiling by Intel in 1988. NOR quickly gobbled up all of the memory sockets that erasable...

  • Dynamic RAMs.  // EDN;9/14/2006, Vol. 51 Issue 19, p30 

    The article focuses on dynamic read-only memory (RAM). Specifying a dynamic RAM involved nothing more than process technology, memory capacity, organization and access-time requirements. However, the emerging 1M-bit devices will complicate specification process. Although every manufacturer of...

  • Technobabble. Kidman, Alex // Australian Personal Computer;Jun2000, Vol. 21 Issue 6, p118 

    Discusses basic information about computer memory. Differentiating factors between internal memory and an external drive; Different forms of memory storage; Organization of data using addresses; Design limitations of original 8086 memory; Difference between a read-only memory and random access...

  • "Announcing a new era of integrated electronics.". Wright, Maury // EDN;7/20/2006, Vol. 51 Issue 15, p30 

    This article recounts the introduction of a new integrated circuit (IC) by Intel Corp. published in the January 15, 1972 issue. The IC is a single-chip microcomputer designed for low-speed microprogrammable applications, such as terminals, peripherals, test systems and process control. The...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics