Deposited tunneling oxide
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United States of America Patent
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Jun 15, 1993
Issued Date -
N/A
app pub date -
Jun 26, 1990
filing date -
May 17, 1988
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Expired
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Abstract
An apparatus and method for depositing a tunneling oxide layer between two conducting layers utilizing a low pressure, low temperature chemical vapor deposition (LPCVD) process is disclosed wherein tetraethylorthosilicate (TEOS) is preferably used. As applied to an electrically erasable programmable read only memory (EEPROM) device having polysilicon layers, the apparatus is constructed by forming a first layer of polysilicon, patterned as desired. A layer of silicon dioxide is then deposited by decomposition of TEOS to form the tunneling oxide to a predetermined thickness. If enhanced emission structures are desired, a layer of relatively thin tunneling oxide may be grown on the first layer of polysilicon. The oxide layer is then annealed and densified, preferably using steam and an inert gas at a specific temperature. A second layer of polysilicon is then formed on top of the tunneling oxide.
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