How Does Temperature Affect GaP Life and What Causes Peak Displacement in GaNP Compound?

[gjfelix2001]

GaP life question!??

Hi, i have a question. I hope someone could help me... Thenks in advance!

1.- I've read that the GaP life is sensitive to the temperature. Can you explain this in more detail?! I mean, what happens at low and high temperature and why.

2.- I've been calculating DOS for the GaNP compound (where the composition goes from 0 to 1). How could be explained the "displacement" (appear and disappear) of peaks in both valence and conductions bands?? For example, in the attached graph, in -7 a peak appears when x goes to 1, and in -6 another peak disappears. The same in the bottom edge of the conduction band and at higher energies.

Thanks a lot

 

[BigJDubs]

!Answer 1: GaP is sensitive to temperature because changes in temperature cause changes in its electronic structure. At low temperatures, the bandgap of GaP closes and the material becomes a conductor, while at high temperatures the bandgap opens up and the material becomes an insulator. This is due to thermal expansion of the lattice which causes a shift in the energy levels of the material, resulting in different electrical properties. Answer 2: The peaks that appear and disappear in the DOS graph of GaNP are due to changes in the density of states (DOS) as the composition of the material shifts from 0 to 1. As the composition of GaNP changes, the electronic structure of the material changes as well, resulting in different energy levels. The peaks in the DOS graph correspond to these energy levels and when they change, the peak in the graph appears or disappears.

 

[charng]

for your question! I can explain the temperature sensitivity of GaP life and the displacement of peaks in the DOS for the GaNP compound.

1. The GaP life is indeed sensitive to temperature. This is because temperature affects the atomic vibrations within the material. At low temperatures, the atoms vibrate less and are more tightly bound to each other, leading to a smaller band gap in the material. This means that it takes less energy for electrons to move from the valence band to the conduction band, making the material more conductive. On the other hand, at high temperatures, the atoms vibrate more and are less tightly bound, leading to a larger band gap and less conductivity.

2. The displacement of peaks in the DOS for the GaNP compound can be explained by the changing composition of the material. As the composition changes from 0 to 1, the electronic structure of the material also changes. This can lead to the appearance or disappearance of peaks in the DOS at different energies. The specific peaks that appear or disappear will depend on the electronic structure of the material at different compositions. This phenomenon is known as the band gap engineering and is commonly seen in compound semiconductors like GaNP.

I hope this helps to answer your questions. If you have any further inquiries, please don't hesitate to ask. Thank you for your interest in GaP life and GaNP compound.