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\subsubsection{\texorpdfstring{Effects of grain boundaries on the optical properties of GaN}{Effects of grain boundaries on the optical properties of GaN}}
\label{sec:effects_of_grain_boundaries_on_the_optical_properties_of_gan}


To understand he atomistic role of grain boundaries on physical
properties of GaN films, we calculate the local electronic structures
of grain boundaries using density functional theory (DFT).

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