What is the effect of impurities in the thin film?

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Mohabattul Zaman Bukhari

Dear Dr Fayroz,

Good question... For your info, in electronics industry, we added impurity to improve or to enhance the performance of the chip/devices. In another word, the increase in impurity concentrate will helps to increase the conductivity of the testing chip/devices.. Impurities do have some benefit after-all. There is one paper that I would like to share on the thin-film research. Hope this info help you in your research/study.. All the best then...

Hassan Alshamsi

Impurities are dopants which change the chemical composition of host .A suitable impurities such as metals (Cu,Fe,Ag,Mn,Co)may be improve performances of n-type semiconductors due to decrease in band gap energy (Fermi level shifts inside conduction band )and electrons transition from valance band to conduction band it requires low energy, while some other impurities may be cause an increase in band gap energy

Fayroz A Sabah

Dear Dr. Mohabattul Zaman Bukhari

Thanks a lot for your response, actually that what happened with me. I found that the impurity in thin film improve the device much more than the pure thin film.

Many thanks, I really appreciate your interest.

Fayroz

Dear Dr. Hassan Alshamsi

Thanks a lot for information, I have a p-type material (CuS) and the XRD data gave me this material peaks (CuS)+ one of its elements only (S). This happened for the first time because I changed the deposition method. And this (S) element significantly improves the thin film.

Best regards

Mouad Ahmad Tarawneh

dear

hope these links will help you

http://www.sciencedirect.com/science/article/pii/S0927024804000868

http://pubs.acs.org/doi/abs/10.1021/jp711622z

https://arxiv.org/abs/0810.0428?frbrVersion=3

http://avs.scitation.org/doi/abs/10.1116/1.568964

http://link.springer.com/article/10.1007/s11837-005-0120-3

regards

If I get S in the XRD data for my thin film which is always give me just CuS (with its phases), can we consider S as an impurity or not?

Alexey A. Serdobintsev

Dear Fayroz

Sulfur can't be considered as impurity because its a component of base material CuS. If XRD gives single S peak it means that you have exessive sulfur in film. And there is so much exessive sulfur that it form separate phase included in CuS film.

Dear Alexey A. Serdobintsev

Thanks a lot for your explanation. So its normal for S to appear in my film, right? I got 3 peaks of S with higher intensity than that of CuS. But the film gave me very good result as a device. I think S here is so useful to improve my film.

If I increase the ratio of S, will CuS thin film convert from p-type to n-type? or there is no relation between the (Cu & S) atoms and the p or n-type material.