Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Liquid crystals line up to make self-healing photovoltaic device

Figure 1: Schematic of the liquid crystal molecule (top) and the formed liquid crystal photovoltaic device (bottom). Purple spheres represent the fullerene and yellow/green chains the oligothiophene, the hydrophobic/hydrophilic tails are represented by blue/red lines respectively. Image:Riken
Figure 1: Schematic of the liquid crystal molecule (top) and the formed liquid crystal photovoltaic device (bottom). Purple spheres represent the fullerene and yellow/green chains the oligothiophene, the hydrophobic/hydrophilic tails are represented by blue/red lines respectively. Image:Riken

Abstract:
Molecules containing both electron donors and acceptors have been functionalized with tails that control their arrangement in a liquid-crystal photovoltaic device

Liquid crystals line up to make self-healing photovoltaic device

Japan | Posted on October 31st, 2008

A huge market is developing for small disposable electronic devices, ranging from security tags to point-of-care diagnostics. Many of these devices require a power source, and photovoltaic devices (solar cells) are an attractive option. However, the expense of preparing and processing inorganic semiconductors used in traditional solar cells precludes their use in such applications. Organic photovoltaic devices, meanwhile have great potential in this area; they are relatively easy to prepare and can be processed by simple techniques such as inkjet printing.

Organic photovoltaic devices contain both electron donors, which release an electron when irradiated, and electron acceptors, which complete the circuit necessary to convert light energy into electrical energy. However, mixtures of typical electron donors such as π-conjugated oligomers—short chains of repeated, unsaturated, organic molecules, with alternating double and single bonds—and electron acceptors, such as C60 (buckminsterfullerene), have a tendency to form alternating stacks that results in lower efficiency. A partial solution is to directly attach the electron donor to the electron acceptor by a covalent bond and have both in a single molecule, but it is still important to have control over how the molecules pack together.

Now, a team of Japanese researchers including Takuzo Aida from the University of Tokyo and Masaki Takata from the RIKEN SPring-8 Center in Harima have designed liquid crystals—a phase that flows like a liquid but has short-range order between the molecules—that spontaneously assemble to form a donor-acceptor array1. "It's important to form separated columns or layers of the donors and acceptors, and to make a large contact area between them," explains Yohei Yamamoto, another member of the team from the Japan Science and Technology Agency in Tokyo.

The molecules they designed feature a fullerene—the electron acceptor—at one end and a thiophene oligomer—the electron donor—at the other. A hydrophobic, or water-repellent, tail is attached to the donor end and a hydrophilic, or water-loving, tail is attached to the acceptor end. This functionalization ensures that the molecules of the liquid crystal line up (Fig. 1) to produce ordered layers of donors and acceptors and results in efficient photovoltaic behavior. "The liquid characteristics are useful as well," notes Yamamoto, "the devices are self-healing as defects in the layer structure can be repaired by a simple heating and cooling process." The design principles developed in this work should lead to the development of high-efficiency organic photovoltaic devices.
Reference

1. Li, W.-S., Yamamoto, Y., Fukushima, T., Saeki, A., Seki, S., Tagawa, S., Masunaga, H., Sasaki, S., Takata, M. & Aida, T. Amphiphilic molecular design as a rational strategy for tailoring bicontinuous electron donor and acceptor arrays: photoconductive liquid crystalline oligothiophene-C60 dyads. Journal of the American Chemical Society 130, 8886-8887 (2008).

The corresponding author for this highlight is based at the RIKEN Structural Materials Science Laboratory

####

For more information, please click here

Copyright © Riken

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 Links

article

Related News Press

News and information

The intermediates in a chemical reaction photographed 'red-handed' Researchers at the UPV/EHU-University of the Basque Country have for the first time succeeded in imaging all the steps in a complex organic reaction and have resolved the mechanisms that explain it May 4th, 2016

New tool allows scientists to visualize 'nanoscale' processes May 4th, 2016

FEI Launches Apreo – Industry-Leading Versatile, High-Performance SEM: The Apreo SEM provides high-resolution surface information with excellent contrast, and the flexibility to accommodate a large range of samples, applications and conditions May 4th, 2016

An Experiment Seeks to Make Quantum Physics Visible to the Naked Eye May 3rd, 2016

Discoveries

The intermediates in a chemical reaction photographed 'red-handed' Researchers at the UPV/EHU-University of the Basque Country have for the first time succeeded in imaging all the steps in a complex organic reaction and have resolved the mechanisms that explain it May 4th, 2016

New tool allows scientists to visualize 'nanoscale' processes May 4th, 2016

A compact, efficient single photon source that operates at ambient temperatures on a chip: Highly directional single photon source concept is expected to lead to a significant progress in producing compact, cheap, and efficient sources of quantum information bits for future appls May 3rd, 2016

Nuclear pores captured on film: Using an ultra fast-scanning atomic force microscope, researchers from the University of Basel have filmed 'living' nuclear pore complexes at work for the first time May 3rd, 2016

Announcements

The intermediates in a chemical reaction photographed 'red-handed' Researchers at the UPV/EHU-University of the Basque Country have for the first time succeeded in imaging all the steps in a complex organic reaction and have resolved the mechanisms that explain it May 4th, 2016

New tool allows scientists to visualize 'nanoscale' processes May 4th, 2016

FEI Launches Apreo – Industry-Leading Versatile, High-Performance SEM: The Apreo SEM provides high-resolution surface information with excellent contrast, and the flexibility to accommodate a large range of samples, applications and conditions May 4th, 2016

An Experiment Seeks to Make Quantum Physics Visible to the Naked Eye May 3rd, 2016

Energy

Nanoparticles present sustainable way to grow food crops May 1st, 2016

NREL finds nanotube semiconductors well-suited for PV systems April 27th, 2016

Researchers create artificial protein to control assembly of buckyballs April 27th, 2016

Flipping a chemical switch helps perovskite solar cells beat the heat April 26th, 2016

Solar/Photovoltaic

NREL finds nanotube semiconductors well-suited for PV systems April 27th, 2016

Flipping a chemical switch helps perovskite solar cells beat the heat April 26th, 2016

Manipulating light inside opaque layers April 24th, 2016

Thin-film solar cells: How defects appear and disappear in CIGSe cells: Concentration of copper plays a crucial role April 23rd, 2016

Printing/Lithography/Inkjet/Inks

Electrically Conductive Graphene Ink Enables Printing of Biosensors April 23rd, 2016

Highlights from the Graphene Flagship April 22nd, 2016

Penn engineers develop first transistors made entirely of nanocrystal 'inks April 11th, 2016

Researchers use 3-D printing to create structure with active chemistry April 4th, 2016

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




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic