Hi, some suggestions:

1) when thickness of ZnS is too thin, substrate nature influence the ZnS phase. Which substrate are you using? glass? It is amorphous...

2) did you tried one post annealing. This step normally improve crystallinity

3) Some authors explains that ZnS deposition should be in different sequential processes; otherwise, chemical reaction is blocked and there is no thickness increased (refers to Nakada for example). Did you tried this?

4) Last suggestion: phase of the film also is related (I do not know exactly why) with the Zn salt used. It is not the same if you used acetate or sulfide...

Cheers,

JM

@ Jose-Maria

Thanks for your suggestions. We've tried everything for that purpose. We are using different substrates including glass. Now we are trying to increase the thickness of the films.Lets see.

Dear sadia baji,I have some suggestions.may be that will help you.(May be you have done all this what I am going to describe here).

1) Mostly,as deposited films are amorphous. You should first confirm that whether your thin film is amorphous or crystalline by checking its morphology using SEM.SEM images can help you telling your film has crystalline structure or not.

2) are u using grazing incidence X-ray diffraction for measurement of thin film??For thin film,We usually use this kind of XRD in which x-ray is incident with very small angle.

3) Thickness of film also count to some extent as far as question of XRD measurement is concerned because some instruments are not well equipped to show peaks for small thickness films.U can increase thickness of film and then do GIXRD to check phase of your film.

Wish you good luck for your research.

thanks