The discussion centers on the influence of dopants, specifically nitrogen in titanium dioxide, on photon absorption in semiconductors and its implications for spectroscopic methods like Raman spectroscopy. It is established that the introduction of dopants creates holes by removing electrons, which directly affects the absorption of photons. This alteration modifies the vibrational modes of the semiconductor crystal, thereby impacting Raman scattering measurements. Understanding these interactions is crucial for accurate spectroscopic analysis of semiconductor materials.
PREREQUISITESResearchers, materials scientists, and spectroscopists interested in semiconductor properties and their characterization through Raman spectroscopy will benefit from this discussion.
From https://blue-scientific.com/news/2019/10/semiconductors-raman-spectroscopy/:photonwanderer said:I have a question regarding the absorption of photons in a semiconductor. Assuming I have a doped semiconductor (e.g. nitrogen in titaniumdioxide) removing electrons and creating holes. Do the created holes influence the absorption of photons and therefore have a direct impact on spectroscopic methods such as Raman spectroscopy?
The photons in Raman spectroscopy couple to the vibrational modes (phonons) of the semiconductor crystal. Dopants are defects in the crystal structure that modify the vibrational modes and measurably alter the Raman scattering.photonwanderer said:I know this is possible, but I do not understand how dopant concentrations interfere with the photons. Could you explain this to me?