Pradeep Kumar Singh Not enough information to give a specific answer. Please post your spectrum - in that way we can see if the peaks are weak or strong, broad or narrow. Plus we need information on the material that gave rise to this spectrum.

thank you sir, here i attach a word file please collect it

Pradeep Kumar Singh OK, you have coronene. This structure has been examined by Raman. Try: Article Structural Analysis of Char by Raman Spectroscopy: Improving...

Also see: https://en.wikipedia.org/wiki/Coronene

Also see the attached and note from the paper itself: 'A helium neon laser (6328 A) and an argon ion laser (5145 A) were used for excitation. However, the strong fluorescence from coronene covered the Raman spectrum and only a few very intense Raman bands were observed'.

thank you so much sir

Pradeep Kumar Singh The Raman spectrum has nothing to do with organic semiconductors other than another set of numbers unique to that molecule It's the chemical structure of the molecule that's important leading to free electrons being able to migrate over the entire anthracene-type structure.