Breakthrough could launch organic electronics beyond cell phone screens

 

  • Organic semiconductors, a class of materials prized for their applications in emerging technologies such as flexible electronics, solar energy conversion, and high-quality color displays for smartphones and televisions.
  • This should particularly help with organic light-emitting diodes that operate at high energy to emit colors such as green and blue.
  • Organic semiconductors are ideal materials for the fabrication of mechanically flexible devices with energy-saving low temperature processes.
  • One of their major disadvantages has been their relatively poor electrical conductivity, which leads to inefficient devices with a shorter operating lifetime than required for commercial applications.
  • Semiconductor devices made up of Silicon is used in

1.Computing

2.Signal Amplification

3.Switching

4.Energy Saving devices such as LED, Solar cells

  • Essential to these main functional is Doping to increase the conductivity. Similarly Organic Semiconductors are doped using Ruthenium compound, reducing agent which means it adds electrons to the organic semiconductor as part of the doping process.
  • The compound belongs to a newly-introduced class of dopants called dimeric organometallic dopants. Unlike many other powerful reducing agents, these dopants are stable when exposed to air but still work as strong electron donors both in solution and solid state.
  • Ruthenium compound a “hyper-reducing dopant, not only its combination of electron donation strength and air stability, but in its ability to work with a class of organic semiconductors that have previously been very difficult to dope.
  • The ruthenium compound is a dimer, which means it consists of two identical molecules, or monomers, connected by a chemical bond.
  • To increase the conductivity of the organic semiconductor, the ruthenium dimer needs to split and release its two identical monomers.
  • Adding energy by irradiating with ultraviolet light, which effectively excited molecules in the semiconductor and initiated the reaction.
  • Under exposure to the light, the dimers split into monomers, and the conductivity rose. the monomers are scattered in the semiconductor in such a way that it is very difficult for them to return to their original configuration and re-form the ruthenium dimer.
  • The light activates the system more, which leads to more light production and more activation until the system is fully activated.

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