XRD of semiconductor material show phase change from crystalline to amorphous , but the optical band gap decresses, what is the reasons behind this ?
Peter Schindler
The amorphous phase tends to be less dense than their crystalline counterparts. Lower density means larger inter-atomic distances (on average). So, qualitatively there is less electronic correlation compared to a crystalline material which results in a lower bandgap. Of course, this is just a qualitative assessment and you would need to look into more sophisticated simulations (DFT) to verify that trend for your specific material.
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Muhammad Zain Akram
Can you please elaborate more? What semiconducting material you are using and what is the morphology of the obtained sample?
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