Absorption of an Exciton and Exciton propagation

In summary, the absorption spectrum of TIPS Pentracene may vary depending on the environment, making it difficult to determine the spectrum for a specific layer without experimentation. Excitation with a wavelength between two maxima in the absorption spectrum is unlikely to result in exciton propagation due to the low energy of the excitation.
  • #1
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I read articles talk about the absorption of the exciton in a solvent, such as TIPS Pentracene in toluene. My question is does the absorption spectrum keep the same for aggregate TIPS Pentracene , in case if I want to know for a layer of TIPS Pentracene?!

My second question is: let's say I know absorption spectrum of Exciton, such as TIPS Pentracene, and I excite it with wavelength between two maxima in the absorption spectrum (not necessary that is minimum but a region between two maxima)... does then exciton propagation occurs?
 
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  • #2
The absorption spectra of a material depends on the environment it is in, so the absorption spectrum of TIPS Pentracene in toluene may be different than that of an aggregate or a layer. Therefore, it is not possible to determine the exact absorption spectrum for a layer of TIPS Pentracene without performing an experiment.When you excite a material with a wavelength between two maxima in the absorption spectrum, the exciton will likely not propagate. This is because the energy of the excitation will be too low for the exciton to move.
 

Related to Absorption of an Exciton and Exciton propagation

1. What is an exciton?

An exciton is a bound state of an electron and a hole in a semiconductor material. It is formed when an electron is excited from the valence band to the conduction band, leaving behind a positively charged hole in the valence band. The electron and hole are attracted to each other and form an exciton.

2. How is an exciton absorbed?

An exciton can be absorbed by a semiconductor material when it is in its ground state. When an incoming photon with energy equal to or greater than the bandgap energy of the material is absorbed, it creates an electron-hole pair, which can then form an exciton.

3. What factors affect the absorption of an exciton?

The absorption of an exciton is affected by several factors, including the bandgap energy of the material, the energy and wavelength of the incident photon, the temperature of the material, and the strength of the Coulomb interaction between the electron and hole.

4. How does an exciton propagate?

An exciton can propagate through a semiconductor material by hopping from one atom to another. This process is known as exciton diffusion. The rate of exciton diffusion is influenced by the material's crystal structure, temperature, and the strength of the Coulomb interaction.

5. What is the significance of exciton propagation?

The propagation of excitons is crucial in many optoelectronic devices, such as solar cells, LEDs, and photodetectors. Excitons can also play a role in energy transfer and harvesting processes in photosynthesis. Understanding exciton propagation can help in the development of more efficient and sustainable technologies.

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