Patent ID: 7575982

Claim:
A method of fabricating compound nitride semiconductor structures, the method comprising: flowing a first group-III precursor and a first nitrogen precursor into a first processing chamber, the first group-III precursor comprising a first group-III element; depositing a first layer over a surface of a first sapphire substrate with a thermal chemical-vapor-deposition process within the first processing chamber using the first group-III precursor and the first nitrogen precursor, the first layer comprising nitrogen and the first group-III element; depositing a second layer over a surface of a second sapphire substrate with the thermal chemical-vapor-deposition process within the first processing chamber using the first group-III precursor and the first nitrogen precursor, the second layer comprising nitrogen and the first group-III element, wherein: the first and second sapphire substrates are different outer substrates of a plurality of stacked substrates bonded together and disposed within the first processing chamber as a stack; the first layer and second layer are deposited on opposite sides of the stack; and depositing the first layer and depositing the second layer are performed simultaneously, further comprising splitting the first and second sapphire substrates from the stack after deposition the first layer and depositing the second layer, wherein splitting the first and second sapphire substrates from the stack comprises cooling the stack to induce a splitting force from a differential thermal expansion between the first layer and the first sapphire substrate and between the second layer and the second sapphire substrate.