Why the composite material has smaller energy gap value compared to the raw material?

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Muhammad Abbas

When you are mixing 2 different materials (of different electronic distribution), there is HOMO-LUMO (so called) interaction, whic changes the band gap.

Muhammad Noer Fajar

dear, Muhammad Abbas, Can you explain to me about the shift of HOMO-LUMO caused of composite from two materials? how to predict(from calculation)the Energy gap from composite material?

Best Regard

Dear Santosh K. Tiwari

Thank you so mauch for your reference papers, but i want to know how to predict the composite energy gap(from calculation) from the raw material. Can you explain to me?