Why does the amorphous Si behave like a direct semiconductor?

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Lei Wu

Tauc, J. (1968). "Optical properties and electronic structure of amorphous Ge and Si". Materials Research Bulletin 3: 37–46. doi:10.1016/0025-5408(68)90023-8）

Ahmed Saeed Hassanien

Yes as suggested by Dr. Lei Wu.

The paper of Tauc, title: "Optical properties and electronic structure of amorphous Ge and Si" is very useful for your study.

It has been attached below.

Good luck