Respected All,
I want understand the effect of gamma radiation exposure on band gap of crystalline material.
I have some literature related to it which mentions that gamma exposure lead to formation of defects and decrease in band gap is some how related to Urbach energy tail.
I want to understand what is exactly happens inside a semiconductor and how is connected with Urbach Energy Tail?
Kindly Explain.
Thanks
The band gap is increased at high dose of gamma radiation and decreased at low dose.
The decrease of the optical energy gap with doses of γ -radiation can be attributed to the arising degree of disorder in the film where formation defects can produce localized states that change the effective Fermi level due to an increase in carrier concentrations.
This increase in carriers in localized states will lead to a decrease in the transition probabilities into the extended states, resulting in additional absorption and reduction in the gap.
I hope you'll find some of the information you're looking for in the attached file. Best regards
Article Effect of γ-irradiation on Structural and Optical Ellipsomet...
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