Method for fabricating an ultralow dielectric constant material as an intralevel or interlevel dielectric in a semiconductor device and electronic device made
First Claim
1. A method for fabricating an ultralow dielectric constant film comprising the steps of:
- flowing a first precursor gas having a linear molecular formula of SiRR′
R″
R′
″
, where R,R′
,R″
, and R′
″
are the same or different and are selected from H, alkyl, and alkoxy into a chamber of a plasma enhanced chemical vapor deposition (PECVD) reactor;
flowing a second precursor gas having one of the following formulas where R1, R2, R3, R4, R5 and R6 may or may not be identical and are selected from hydrogen, alkyl, alkenyl or alkynyl groups that may be linear, branched, cyclic, polycyclic and may be functionalized with oxygen, nitrogen or fluorine containing substituents into said chamber; and
depositing an ultralow k film from said precursor gases on a substrate.
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Abstract
A method for fabricating a thermally stable ultralow dielectric constant film comprising Si, C, O and H atoms in a parallel plate chemical vapor deposition process utilizing a plasma enhanced chemical vapor deposition (“PECVD”) process is disclosed. Electronic devices containing insulating layers of thermally stable ultralow dielectric constant materials that are prepared by the method are further disclosed. To enable the fabrication of a thermally stable ultralow dielectric constant film, specific precursor materials are used, such as, silane derivatives, for instance, diethoxymethylsilane (DEMS) and organic molecules, for instance, bicycloheptadiene and cyclopentene oxide.
419 Citations
28 Claims
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1. A method for fabricating an ultralow dielectric constant film comprising the steps of:
-
flowing a first precursor gas having a linear molecular formula of SiRR′
R″
R′
″
, where R,R′
,R″
, and R′
″
are the same or different and are selected from H, alkyl, and alkoxy into a chamber of a plasma enhanced chemical vapor deposition (PECVD) reactor;flowing a second precursor gas having one of the following formulas where R1, R2, R3, R4, R5 and R6 may or may not be identical and are selected from hydrogen, alkyl, alkenyl or alkynyl groups that may be linear, branched, cyclic, polycyclic and may be functionalized with oxygen, nitrogen or fluorine containing substituents into said chamber; and depositing an ultralow k film from said precursor gases on a substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for fabricating a thermally stable ultralow k film comprising the steps of:
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providing a plasma enhanced chemical vapor deposition (PECVD) reactor; positioning a pre-processed wafer on a substrate chuck having an area between about 300 cm2 and about 800 cm2 and maintaining a gap between said wafer and a top electrode between about 1 cm and about 10 cm; flowing a first precursor gas comprising linear silane derivative molecules into said PECVD reactor; flowing at least a second precursor gas comprising a compound having one of the following formulas where R1, R2, R3, R4, R5 and R6 may or may not be identical and are selected from hydrogen, alkyl, alkenyl or alkynyl groups that may be linear, branched, cyclic, polycyclic and may be functionalized with oxygen, nitrogen or fluorine containing substituents into said PECVD reactor, and depositing an ultralow k film on said wafer.
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27. A method for fabricating a thermally stable ultralow k film comprising the steps of:
-
providing a plasma enhanced chemical vapor deposition (PECVD) reactor; positioning a wafer on a substrate chuck having an area between about 300 cm2 and about 800 cm2, and maintaining a gap between the wafer and a top electrode between about 1 cm and about 10 cm; flowing into said reactor over said wafer kept at a temperature between about 25°
C. and about 400°
C., a first precursor gas of a linear silane derivative at a flow rate between about 5 sccm and about 1000 sccm, and a second precursor gas at a flow rate between about 5 sccm and about 1000 sccm, while keeping a pressure in said reactor between about 50 mtorr and about 8000 mtorr, said second precursor gas comprising a compound having one of the following formulaswhere R1, R2, R3, R4, R5 and R6 may or may not be identical and are selected from hydrogen, alkyl, alkenyl or alkynyl groups that may be linear, branched, cyclic, polycyclic and may be functionalized with oxygen, nitrogen or fluorine containing substituents; depositing an ultralow k film on said wafer under a RF power density between about 0.05 W/cm2 and about 3.0 W/cm2; and treating said ultralow k film to improve the stability of said film, said treating comprises an energy source selected from thermal, chemical, ultraviolet (UV) light, electron beam (e-beam), microwave, plasma and a combination thereof. - View Dependent Claims (28)
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Specification