Three-dimensional non-volatile memory structure and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-9837435-B1
Application number	US-201715461478-A
Country	US
Kind code	B1
Filing date	Mar 17, 2017
Priority date	Jan 20, 2017
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A three-dimensional non-volatile memory structure including a substrate, a stacked structure, a charge storage pillar, a channel pillar, and a ferroelectric material pillar is provided. The stacked structure is disposed on the substrate and includes a plurality of conductive layers and a plurality of first dielectric layers, and the conductive layers and the first dielectric layers are alternately stacked. The charge storage pillar is disposed in the stacked structure. The channel pillar is disposed inside the charge storage pillar. The ferroelectric material pillar is disposed inside the channel pillar.

First claim

What is claimed is:

1. A three-dimensional non-volatile memory structure, comprising:
a substrate;
a stacked structure disposed on the substrate and comprising a plurality of conductive layers and a plurality of first dielectric layers, wherein the conductive layers and the first dielectric layers are alternately stacked;
a charge storage pillar disposed in the stacked structure;
a channel pillar disposed inside the charge storage pillar; and
a ferroelectric material pillar disposed inside the channel pillar.

2. The three-dimensional non-volatile memory structure of claim 1 , wherein a material of the conductive layers comprises a metal or a doped polysilicon, the metal comprises tungsten, a material of the first dielectric layers comprises silicon oxide, and a material of the channel pillar comprises polysilicon.

3. The three-dimensional non-volatile memory structure of claim 1 , wherein the charge storage pillar comprises:
a second dielectric layer adjoined to the stacked structure;
a third dielectric layer adjoined to the channel pillar; and
a charge trapping layer located between the second dielectric layer and the third dielectric layer.

4. The three-dimensional non-volatile memory structure of claim 3 , wherein a material of the second dielectric layer and the third dielectric layer comprises silicon oxide, and a material of the charge trapping layer comprises silicon nitride.

5. The three-dimensional non-volatile memory structure of claim 1 , wherein the ferroelectric material pillar has ferroelectric negative capacitance characteristics.

6. The three-dimensional non-volatile memory structure of claim 1 , wherein a material of the ferroelectric material pillar comprises HfZrO, HfAlO, HfSiO, HfYO, HfLaO, HfGdO, HfSrO, HfSmO, PZT, BST, SBT, PLZT, LiNbO 3 , BaMgF, BaMnF, BaFeF, BaCoF, BaNiF, BaZnF, SrAlF 5 , PVDF, PVDF-TrEE, or La 1-x Sr x MnO 3 .

7. The three-dimensional non-volatile memory structure of claim 6 , wherein a doping ratio of Zr of HfZrO is 30% to 70%,
a doping ratio of Al of HfAlO is 2% to 12%,
a doping ratio of Si of HfSiO is 2% to 5%,
a doping ratio of Y of HfYO is 2% to 12%,
a doping ratio of La of HfLaO is 3% to 6%,
a doping ratio of Gd of HfGdO is 2% to 6%,
a doping ratio of Sr of HfSrO is 2% to 6%,
a doping ratio of Sm of HfSmO is 2% to 6%.

8. The three-dimensional non-volatile memory structure of claim 1 , further comprising a conductive pillar disposed inside the ferroelectric material pillar.

9. The three-dimensional non-volatile memory structure of claim 8 , wherein a material of the conductive pillar comprises a metal compound.

10. The three-dimensional non-volatile memory structure of claim 9 , wherein the metal compound comprises metal nitride or metal carbide.

11. The three-dimensional non-volatile memory structure of claim 10 , wherein the metal compound comprises titanium nitride, tantalum nitride, tantalum carbon nitride, tungsten nitride, titanium tungsten nitride, titanium carbide, titanium aluminum carbide, tantalum carbide, tantalum aluminum carbide, or niobium aluminum carbide.

12. A manufacturing method of a three-dimensional non-volatile memory structure, comprising:
forming a stacked structure on a substrate, wherein the stacked structure comprises a plurality of conductive layers and a plurality of first dielectric layers, and the conductive layers and the first dielectric layers are alternately stacked;
forming a charge storage pillar in the stacked structure;
forming a channel pillar inside the charge storage pillar; and
forming a ferroelectric material pillar inside the channel pillar.

13. The manufacturing method of the three-dimensional non-volatile memory structure of claim 12 , wherein the charge storage pillar comprises:
a second dielectric layer adjoined to the stacked structure;
a third dielectric layer adjoined to the channel pillar, and
a charge trapping layer located between the second dielectric layer and the third dielectric layer.

14. The manufacturing method of the three-dimensional non-volatile memory structure of claim 12 , wherein the ferroelectric material pillar has ferroelectric negative capacitance characteristics.

15. The manufacturing method of the three-dimensional non-volatile memory structure of claim 12 , wherein a material of the ferroelectric material pillar comprises HtZrO, HfAlO, HfSiO, HfYO, HfLaO, HfGdO, HfSrO, HfSmO, PZT, BST, SBT, PLZT, LiNbO 3 , BaMgF, BaMnF, BaFeF, BaCoF, BaNiF, BaZnF, SrAlF 5 , PVDF, PVDF-TrEE, or La 1-x Sr x MnO 3 .

16. The manufacturing method of the three-dimensional non-volatile memory structure of claim 15 , wherein a doping ratio of Zr of HfZrO is 30% to 70%,
a doping ratio of Al of HfAlO is 2% to 12%,
a doping ratio of Si of HfSiO is 2% to 5%,
a doping ratio of Y of HfYO is 2% to 12%,
a doping ratio of La of HfLaO is 3% to 6%,
a doping ratio of Gd of HfGdO is 2% to 6%,
a doping ratio of Sr of HfSrO is 2% to 6%,
a doping ratio of Sm of HfSmO is 2% to 6%.

17. The manufacturing method of the three-dimensional non-volatile memory structure of claim 12 , further comprising forming a conductive pillar inside the ferroelectric material pillar.

18. The manufacturing method of the three-dimensional non-volatile memory structure of claim 17 , wherein a material of the conductive pillar comprises a metal compound.

19. The manufacturing method of the three-dimensional non-volatile memory structure of claim 18 , wherein the metal compound comprises metal nitride or metal carbide.

20. The manufacturing method of the three-dimensional non-volatile memory structure of claim 19 , wherein the metal compound comprises titanium nitride, tantalum nitride, tantalum carbon nitride, tungsten nitride, titanium tungsten nitride, titanium carbide, titanium aluminum carbide, tantalum carbide, tantalum aluminum carbide, or niobium aluminum carbide.

Assignees

• Phison Electronics Corp

Inventors

• Chang Chun-Yen
• Cheng Chun-Hu
• Lin Wei
• Chiu Yu-Chien
• Liu Chien

Classifications

• H01L29/7926

  Electricity · mapped topic

• H01L21/8221

  Electricity · mapped topic

• H01L29/1037

  Electricity · mapped topic

• H01L27/11582 Primary

  Electricity · mapped topic

• H01L27/0688

  Electricity · mapped topic