Patent ID: 7732300

Claim:
A method for bonding aluminum (Al) electrodes of semiconductor substrates, comprising: (a) forming first and second aluminum (Al) electrodes on first and second semiconductor substrates, respectively; (b) depositing a metal alloy that comprises aluminum (Al) and copper (Cu) onto the first and second aluminum (Al) electrodes; (c) arranging the aluminum (Al) electrodes of the first and second semiconductor substrates to face and overlap with each other such that the metal alloy deposited on the first aluminum (Al) electrode comes into contact with the metal alloy deposited on the second aluminum (Al) electrode; and (d) heating the aluminum (Al) electrodes at a temperature lower than a melting point of the deposited metal alloy, and applying a specific pressure onto the two semiconductor substrates, wherein the heating and applying a specific pressure of step (d) is performed after the depositing a metal alloy onto the first and second aluminum (Al) electrodes of step (b) and arranging the aluminum (Al) electrodes to face and overlap with each other of step (c) are performed.