You can plot αd instead of α.sounouhid said:thanks Vagn for replying me
but i don't have the thickness of the film (so i can not determine the absorption coefficient alpha that i need for the tauc plot)
Replace the α's for the Tauc plot with αd's. As d is constant, it just changes the scale.sounouhid said:and how can i determine the band gap from that plot
The optical band gap of a cobalt ferrite is the minimum amount of energy needed for an electron to transition from the valence band to the conduction band, creating an electron-hole pair. It is typically measured in electron volts (eV) and can range from 1.5 to 3.5 eV for cobalt ferrite.
The optical band gap of a cobalt ferrite can be determined through various experimental techniques such as UV-Vis spectroscopy, ellipsometry, or photoluminescence spectroscopy. These methods involve shining light of different wavelengths onto the material and measuring the absorption or emission of light, allowing for the calculation of the band gap.
The optical band gap of a cobalt ferrite can be influenced by various factors such as the composition, crystal structure, and synthesis method of the material. It can also be affected by external factors like temperature, pressure, and the presence of impurities or defects in the material.
The optical band gap of a cobalt ferrite is important because it determines the material's ability to absorb or emit light. This makes it crucial in various applications such as optoelectronics, solar cells, and photocatalysis. It also provides valuable information about the electronic and optical properties of the material.
Yes, the optical band gap of a cobalt ferrite can be tuned by changing the composition, crystal structure, or synthesis method of the material. This can be achieved through techniques such as doping, alloying, or controlling the growth conditions. Tuning the band gap can allow for the customization of the material's properties for specific applications.