Methods for forming a metal silicate film on a substrate in a reaction chamber and related semiconductor device structures

Patent metadata

Field	Value
Publication number	US-2020161438-A1
Application number	US-201816194041-A
Country	US
Kind code	A1
Filing date	Nov 16, 2018
Priority date	Nov 16, 2018
Publication date	May 21, 2020
Grant date	—

Abstract

Methods for forming a metal silicate film on a substrate in a reaction chamber by a cyclical deposition process are provided. The methods may include: regulating the temperature of a hydrogen peroxide precursor below a temperature of 70° C. prior to introduction into the reaction chamber, and depositing the metal silicate film on the substrate by performing at least one unit deposition cycle of a cyclical deposition process. Semiconductor device structures including a metal silicate film formed by the methods of the disclosure are also provided.

First claim

1 . A method for forming a metal silicate film on a substrate in a reaction chamber by a cyclical deposition process, the method comprising:
regulating the temperature of a hydrogen peroxide precursor below a temperature of 70° C. prior to introduction into the reaction chamber; and depositing the metal silicate film on the substrate by performing at least one unit deposition cycle of a cyclical deposition process, wherein a unit deposition cycle comprises:
contacting the substrate with a metal vapor phase precursor;
contacting the substrate with a silicon vapor phase precursor; and
contacting the substrate with the hydrogen peroxide precursor.

2 . The method of claim 1 , wherein the hydrogen peroxide precursor decomposes proximate to the substrate.

3 . The method of claim 1 , wherein the reaction chamber comprises a showerhead reactor utilizing a showerhead gas distribution mechanism to introduce the metal vapor phase precursor, the silicon vapor phase precursor, and the hydrogen peroxide precursor into the reaction chamber and the method further comprises regulating the temperature of the showerhead gas distribution mechanism to a temperature below 70° C.

4 . The method of claim 1 , further comprising regulating the temperature of at least one chamber wall of the reaction chamber at least at those portion of the at least one chamber wall exposed to the metal vapor phase precursor, the silicon vapor phase precursor, and the hydrogen precursor, to a temperature below 70° C.

5 . The method of claim 1 , wherein the metal vapor phase precursor comprises at least one of: a hafnium precursor, an yttrium precursor, a zirconium precursor, an aluminum precursor, a scandium precursor, a cerium precursor, an erbium precursor, or a strontium precursor.

6 . The method of claim 5 , wherein the aluminum precursor comprises at least one of: trimethylaluminum (TMA), triethylaluminum (TEA), aluminum trichloride (AlCl 3 ), dimethyaluminum hydride (DMAH), or dimethylaluminum isopropoxide (DMAI).

7 . The method of claim 1 , wherein the metal silicate film comprises an aluminum silicate film (Al x Si y O z ) with an atomic percentage of silicon between approximately 10 atomic-% and approximately 60 atomic-%.

8 . The method of claim 7 , wherein the metal silicate film comprises an aluminum silicate film (Al x Si y O z ) with an atomic percentage of silicon between approximately 10 atomic-% and approximately 30 atomic-%.

9 . The method of claim 1 , wherein the metal silicate film comprises an aluminum silicate film (Al x Si y O z ) with an atomic percentage of silicon less than 10 atomic-%.

10 . The method of claim 1 , wherein the silicon vapor phase reactant comprises at least one of: silanediamine N,N,N′,N-tetraethyl (C 8 H 22 N 2 Si), BTBAS (bis(tertiarybutylamino)silane), BDEAS (bis(diethylamino)silane), TDMAS (tris(dimethylamino)silane), hexakis(ethylamino)disilane (Si 2 (NHC 2 H 5 ) 6 ), silicon tetraiodide (Si 4 ), silicon tetrachloride (SiCl 4 ), hexachlorodisilane (HCDS), pentachlorodisilane(PCDS), a silane, an aminosilane, or a silicon halide.

11 . The method of claim 1 , wherein the metal silicate film is deposited on the substrate without an incubation period.

12 . The method of claim 1 , wherein the substrate comprises a plurality of channel regions and the metal silicate film is deposited directly on the plurality of channel regions.

13 . The method of claim 12 , further comprising passivating a surface of the plurality of channel regions prior to deposition of the metal silicate film, wherein passivating the surface comprises exposing the surface of the plurality of channel regions to a gas-phase sulfur precursor.

14 . The method of claim 13 , wherein the gas-phase sulfur precursor comprises at least one of (NH 4 ) 2 S, H 2 S, NH 4 HS, or an organosulfur compound.

15 . The method of claim 12 , further comprising depositing a high-k dielectric material directly on the metal silicate film, such that the metal silicate film forms an interface layer disposed directly between the plurality of channel regions and the high-k dielectric material.

16 . The method of claim 13 , wherein the interface trap density at an interface between the plurality of channel regions and the metal silicate film is less than about 7 e 11 cm −2 eV −1 for mid-gap states.

17 . The method of claim 12 , wherein the metal silicate film has an effective oxide charge density of less than 5 e 10 cm −2 .

18 . The method of claim 12 , wherein the plurality of channel regions comprises silicon germanium (Si 1-x Ge x ) wherein x is between 0 and approximately 0.50.

19 . A semiconductor processing apparatus configured for performing the method of claim 1 .

20 . A semiconductor device structure comprising:
a silicon germanium (Si 1-x Ge x ) channel region; an interface layer comprising an aluminum silicate film disposed directly on the silicon germanium (Si 1-x Ge x ) channel region; and a high-k dielectric material disposed directly on the interface layer; wherein an interface trap density at an interface between the silicon germanium (Si 1-x Ge x ) channel region and the interface layer is less than about 7 e 11 cm −2 eV −1 for mid-gap states.

21 - 27 . (canceled)

Assignees

• Asm Ip Holding Bv

Inventors

• Tang Fu
• Hsu Peng-Fu
• Givens Michael Eugene
• Xie Qi

Classifications

• C23C16/401

  containing silicon · CPC title

• C23C16/403

  of aluminium, magnesium or beryllium · CPC title

• H10P14/6929

  the material containing aluminium, e.g. AlSiOx · CPC title

• H10P14/6339

  deposition by cyclic CVD, e.g. ALD, ALE or pulsed CVD · CPC title

• H10P14/668

  the materials being characterised by the deposition precursor materials · CPC title