- About Us
- Nano-Social Network
- Nano Consulting
- My Account
Optoelectronic components based on a dye-sensitized TiO2 solar cell
Electronic components must continue to get smaller: Miniaturization has now reached the nanometer scale (10-9 m). In this tiny world, classic semiconductor technology is reaching its limits. We now need switches and other devices whose dimensions are on the scale of individual molecules. The difficulty with this is in the addressability and compatibility of molecular systems with the available nanoelectronic components. Until now, all molecular systems require at least one step in which a solution must be injected into the system and then rinsed out again, which is time-consuming.
L. Furtado, K. Araki, H. E. Toma, and co-workers at the University of São Paulo in Brazil describe for the first time an optoelectronic molecular gate that directly absorbs light and gives off electrical impulses.
The gate consists of a glass electrode onto which a thin, nanocrystalline film of TiO2 is deposited. A dye, in this case a cluster of three ruthenium–pyrazinecarboxylate complexes, is adsorbed to this surface. A platinum counter electrode is used, and the space between the electrodes is filled by an electrolyte solution of I 3-/I2 in CH3CN.
When this gate is irradiated with light, electrons are excited, which leads to charge separation and a flow of current. The direction of the current changes depending on the wavelength of the light irradiating the system: at 350 nm, the electrons flow from the Pt electrode to the glass electrode; at 420 nm, they flow the other way.
At 350 nm, the TiO2 layer absorbs the light and gives off electrons to the underlying glass electrode. To compensate, the corresponding number of electrons is removed from the ruthenium cluster, which replaces them with electrons from the Pt electrode. At 420 nm, however, the ruthenium complexes are induced to give off electrons to the Pt electrode, which are re-supplied from the TiO2 layer.
The result is a switch that is not only turned on and off by light, but whose signal can change direction on the basis of the wavelength of light used.
Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
|Related News Press|
UC researchers use gold coating to control luminescence of nanowires: University of Cincinnati physicists manipulate nanowire semiconductors in pursuit of making electronics smaller, faster and cheaper March 17th, 2017
A SOI wafer is a suitable substrate for gallium nitride crystals: Improved characteristics in power electronics and radio applications can be achieved by using a SOI wafer for gallium nitride growth March 4th, 2017
Smart multi-layered magnetic material acts as an electric switch: New study reveals characteristic of islands of magnetic metals between vacuum gaps, displaying tunnelling electric current March 1st, 2017
ATTOPSEMI Technology Joins FDXcelerator Program to Deliver Advanced Non-Volatile Memory IP to GLOBALFOUNDRIES 22 FDX® Technology Platform: Leading-edge I-fuse™ brings higher reliability, smaller cell size and ease of programmability for consumer, automotive, and IoT applications March 27th, 2017
Leti and HORIBA Scientific to Host Webinar on Ultrafast Characterization Tool: Plasma Profiling Time-of-Flight Mass Spectrometer Tool Cuts Optimization Time In Layer Deposition and Fabrication of Wide Range of Applications March 27th, 2017