Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > Photochromic bismuth complexes show great promise for optical memory elements

Working routine in Center for Energy Science and Technology.

CREDIT
Timur Sabirov / Skoltech
Working routine in Center for Energy Science and Technology. CREDIT Timur Sabirov / Skoltech

Abstract:
Russian chemists obtained a new photochromic complex composed of of bismuth (III) and viologen cations and used the new compound to create optical memory elements which were shown to be highly efficient and stable. The outcomes of the study may serve to expand the range of microelectronics components in the future. The research was published in the journal Chemical Communications.

Photochromic bismuth complexes show great promise for optical memory elements

Moscow, Russia | Posted on July 24th, 2020

Modern memory devices, such as memory cards and SSD drives, are based on electrical switches known as transistors, which can form two quasi-stable electrical states due to the presence of additional components capable of accumulating and storing electrical charge. The value of this charge enables or disables electric current through transistor at certain read voltage. In memory elements, the high current or "open" and low current or "closed" states correspond to logic 1 and logic 0, respectively, or vice versa. To write or erase one bit of information, the transistor should switch from one state to the other. In the case of photochromic materials, i.e. materials that change color when exposed to light, the switching requires a pulse of light and, quite often, superposition of the electric field, too.

Viologen cations consist of two linked aromatic pyridine rings (C10H8N2R2)2+ with two substituents (R) at the nitrogen atoms. Some halide metal and viologen complexes, i.e. those that contain elements of the seventh group of the Periodic Table (F, Cl, Br, and I), can change color when exposed to light. These compounds have not yet found application in electronics despite their highly appealing optoelectronic characteristics. For the first time ever, a group of scientists from the Skolkovo Institute of Science and Technology (Moscow), the Institute of Problems of Chemical Physics of RAS (Chernogolovka) and the Nikolaev Institute of Inorganic Chemistry of SB RAS (Novosibirsk) led by Skoltech professor Pavel Troshin succeeded in designing a photosensitive bismuth complex with optimal properties and demonstrated that it can be successfully used as advanced optically triggered material for memory devices.

"Earlier, we showed the prospects of using organic photochromic materials in photoswitchable field-effect transistors and optical memory elements. Recently, we looked into a series of dihetarylethene derivatives and established very important correlations between their structure and properties. In the current study, we have made a step forward along this avenue of research by using metal compounds in optical switches and memory elements," explains Lyubov Frolova, a senior research scientist at Skoltech.

The researchers assembled organic field-effect transistors with an additional photosensitive layer made of the bismuth complex with viologen cations. As an intermediate device frabrication step, the complex was crystallized as a film from a solution on a dielectric aluminum oxide layer. The scientists found that the device can be "programmed" by simultaneously applied light pulse and electric bias between the device electrodes, which results in the device switching between two or more quasi-stable electrical states. Having multiple states in the transistor opens up great prospects for creating multi-bit memory elements for high-density data recording.

The current running through the transistor channel can be modulated by 100 times in half a second and by 10,000 times in several tens of seconds of "programming". This figure points to high efficiency of the devices, which matches the characteristics of the best organic photosensitive field-effect transistors known to date. The authors assume that their devices will have long-term data storage capacity and will be able to withstand many write-read-erase cycles. The recent research has demonstrated their stable operation in over 200 cycles.

####

For more information, please click here

Contacts:
Ilyana Zolotareva

897-777-14699

Copyright © Skolkovo Institute of Science and Technology (Skoltech)

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

When Dirac meets frustrated magnetism August 3rd, 2020

New printing process advances 3D capabilities: Technology aims to improve quality of products used in business, industry and at home July 31st, 2020

TU Graz researchers synthesize nanoparticles tailored for special applications July 31st, 2020

Scientists discover new class of semiconducting entropy-stabilized materials July 31st, 2020

Possible Futures

Physicists find misaligned carbon sheets yield unparalleled properties July 31st, 2020

Way, shape and form: Synthesis conditions define the nanostructure of manganese dioxide July 31st, 2020

New printing process advances 3D capabilities: Technology aims to improve quality of products used in business, industry and at home July 31st, 2020

Scientists discover new class of semiconducting entropy-stabilized materials July 31st, 2020

Memory Technology

Manipulating non-magnetic atoms in a chromium halide enables tuning of magnetic properties: New approach creates synthetic layered magnets with unprecedented level of control over their magnetic properties July 24th, 2020

Graphene-Adsorbate van der Waals bonding memory inspires 'smart' graphene sensors July 17th, 2020

Process for 'two-faced' nanomaterials may aid energy, information tech June 26th, 2020

EU Team Demonstrates Full Data-Transfer Silicon Photonics Module Delivering 100 Gb/s and Develops Building Blocks for Tb/s: COSMICC Project Breakthroughs ‘Will Answer Tremendous Market Needs with a Target Cost per Bit that Traditional Wavelength-Division Multiplexing Transceivers June 23rd, 2020

Optical computing/Photonic computing

Scaling up the quantum chip: MIT engineers develop a hybrid process that connects photonics with 'artificial atoms,' to produce the largest quantum chip of its type July 10th, 2020

A Tremendous Recognition’ Engineer Jonathan Klamkin earns prestigious award from DARPA June 23rd, 2020

Polymers can fine-tune attractions between suspended nanocubes: Interactions between hollow silica nanocubes suspended in a solution can be adjusted by varying the concentration of polymer molecules added to the mixture. June 19th, 2020

Printed perovskite LEDs: An innovative technique towards a new standard process of electronics manufacturing June 12th, 2020

Discoveries

When Dirac meets frustrated magnetism August 3rd, 2020

Way, shape and form: Synthesis conditions define the nanostructure of manganese dioxide July 31st, 2020

New printing process advances 3D capabilities: Technology aims to improve quality of products used in business, industry and at home July 31st, 2020

TU Graz researchers synthesize nanoparticles tailored for special applications July 31st, 2020

Materials/Metamaterials

Way, shape and form: Synthesis conditions define the nanostructure of manganese dioxide July 31st, 2020

TU Graz researchers synthesize nanoparticles tailored for special applications July 31st, 2020

Study: Mapping crystal shapes could fast-track 2D materials: Experts call for global effort to clear hurdles to mass production July 27th, 2020

Discovery of disordered nanolayers in intermetallic alloys: Resolving alloys' strength-ductility trade-off and thermal instability July 24th, 2020

Announcements

When Dirac meets frustrated magnetism August 3rd, 2020

New printing process advances 3D capabilities: Technology aims to improve quality of products used in business, industry and at home July 31st, 2020

TU Graz researchers synthesize nanoparticles tailored for special applications July 31st, 2020

Scientists discover new class of semiconducting entropy-stabilized materials July 31st, 2020

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

When Dirac meets frustrated magnetism August 3rd, 2020

Way, shape and form: Synthesis conditions define the nanostructure of manganese dioxide July 31st, 2020

New printing process advances 3D capabilities: Technology aims to improve quality of products used in business, industry and at home July 31st, 2020

TU Graz researchers synthesize nanoparticles tailored for special applications July 31st, 2020

Photonics/Optics/Lasers

Scientists discover new class of semiconducting entropy-stabilized materials July 31st, 2020

Brazilian researchers develop an optical fiber made of gel derived from marine algae: Edible, biocompatible and biodegradable, these fibers have potential for various medical applications. The results are described in the journal Scientific Reports. July 24th, 2020

Manipulating non-magnetic atoms in a chromium halide enables tuning of magnetic properties: New approach creates synthetic layered magnets with unprecedented level of control over their magnetic properties July 24th, 2020

Project creates more powerful, versatile ultrafast laser pulse: Institute of Optics research sets record for shortest laser pulse for newly developed technology, work that has important applications in engineering and biomedicine July 24th, 2020

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project