Source: http://www.google.com/patents/US7776644?ie=ISO-8859-1&dq=7,328,163
Timestamp: 2016-02-06 16:20:27
Document Index: 563316739

Matched Legal Cases: ['Application No. 10', 'Application No. 1020030017694', 'Application No. 1020030092057', 'Application No. 1020040024741', 'Application No. 1020040052563', 'Application No. 1020040090920']

Patent US7776644 - Phase change memory cell and method and system for forming the same - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsFor fabricating a phase change memory cell, a layer of phase change material and a layer of a first electrode material are deposited. In addition, the first electrode material is patterned using an etchant including a low-reactivity halogen element such as bromine or iodine to form a first electrode....http://www.google.com/patents/US7776644?utm_source=gb-gplus-sharePatent US7776644 - Phase change memory cell and method and system for forming the sameAdvanced Patent SearchPublication numberUS7776644 B2Publication typeGrantApplication numberUS 11/595,727Publication dateAug 17, 2010Filing dateNov 10, 2006Priority dateJul 31, 2006Fee statusPaidAlso published asUS20080026586Publication number11595727, 595727, US 7776644 B2, US 7776644B2, US-B2-7776644, US7776644 B2, US7776644B2InventorsHong Cho, Seung-pil Chung, Young-Jae KimOriginal AssigneeSamsung Electronics Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (9), Non-Patent Citations (9), Classifications (14), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetPhase change memory cell and method and system for forming the same
US 7776644 B2Abstract
forming a first electrode material on the phase change material;
patterning the first electrode material with an etch recipe including at least one of bromine and iodine and not including chlorine to form a first electrode; and
pattering the phase change material with the etch recipe including at least one of bromine and iodine and not including chlorine to form a phase change structure,
wherein the first electrode material and the phase change material are etched with the etch recipe including the steps of:
flowing HBr gas into a reaction chamber at a flow rate in a range from 40 to 60 sccm (standard cubic centimeters per minute); and
flowing Ar gas into the reaction chamber at a flow rate in a range from 40 to 60 sccm (standard cubic centimeters per minute).
2. The method of claim 1, wherein the etch recipe further includes the steps of:
setting a pressure within the reaction chamber to be from 3 to 7 milli-Torr or from 20 to 40 milli-Torr;
setting a bias power applied on a semiconductor substrate having the semiconductor device fabricated thereon to be from 150 to 250 Watts; and
setting a source power for generating plasma to be from 400 to 600 Watts.
wherein the phase change structure is disposed between the first and second electrodes.
4. The method of claim 3, wherein each of the first and second electrodes is comprised of a respective one of TiN, TiAlN, TiBN, TiSiN, TaN, TaAlN, TaBN, TaSiN, WN, WBN, WSiN, WAIN, ZrN, ZrSiN, ZrAlN, ZrBN, MoN, Al, Al—Cu, Al—Cu—Si, WSix, Ti, W, Mo, Ta, and TiW, and wherein the phase change material is one of Ge—Sb—Te, Ge—Bi—Te, As—Sb—Te, As—Ge—Sb—Te, Sn—Sb—Te, Sn—Sb—Te, In—Sn—Sb—Te, Ag—In—Sb—Te, GroupVA-Sb—Te, GroupVIA-Sb—Te, GroupVA-Sb—Se, GroupVIA-Sb—Se, Ge—Sb—Te—Si, As—Sb—Te—Si, As—Ge—Sb—Te—Si, Sn—Sb—Te—Si, In—Sn—Sb—Te—Si, Ag—In—Sb—Te—Si, GroupVA-Sb—Te—Si, GroupVIA-Sb—Te—Si, GroupVA-Sb—Se—Si, and GroupVIA-Sb—Se—Si.
patterning the first electrode material with a first etch recipe including at least one of bromine and iodine and not including chlorine to form a first electrode; and
pattering the phase change material with a second etch recipe including at least one of bromine and iodine and not including chlorine to form a phase change structure,
wherein the first electrode material is etched in a dry etch system with the first etch recipe including the steps of:
flowing HBr gas into the dry etch system at a flow rate of from 40 to 60 sccm (standard cubic centimeters per minute);
flowing Ar gas into the dry etch system at a flow rate of from 40 to 60 sccm (standard cubic centimeters per minute);
setting a pressure within the dry etch system to be from 3 to 7 milli-Torr or from 20 to 40 milli-Torr;
setting a source power for generating plasma to be from 400 to 600 Watts,
and wherein the phase change material is etched in the dry etch system with the second etch recipe including the steps of:
flowing HBr gas into the dry etch system at a flow rate of from 15 to 35 sccm (standard cubic centimeters per minute);
setting a pressure within the dry etch system to be from 5 to 20 milli-Torr;
setting a bias power applied on the semiconductor substrate within the dry etch system to be from 150 to 250 Watts; and
setting a source power for generating plasma within the dry etch system to be from 400 to 600 Watts. Description
The phase change material 104 is comprised of a chalcogenide material such as Ge—Sb—Te (GST) or Ge—Bi—Te (GBT) for example. Generally, a chalcogenide alloy contains at least one element from column V or VI of the Periodic Table of the Elements. The bottom electrode 106 is comprised of a high resistivity material such as TiAlN or TiN for example. The top electrode is comprised of a conductive material such as W, Ti, TiN, Ta, or TaN for example.
The bottom electrode 208 is comprised of a high resistivity material and may be comprised of one of TiN, TiAlN, TiBN, TiSiN, TaN, TaAlN, TaBN, TaSiN, WN, WBN, WSiN, WAlN, ZrN, ZrSiN, ZrAlN, ZrBN, MoN, Al, Al—Cu, Al—Cu—Si, WSix, Ti, W, Mo, Ta, and TiW, in an example embodiment of the present invention. The top electrode material 216 is a conductive material and may be comprised of one of TiN, TiAlN, TiBN, TiSiN, TaN, TaAlN, TaBN, TaSiN, WN, WBN, WSiN, WAlN, ZrN, ZrSiN, ZrAlN, ZrBN, MoN, Al, Al—Cu, Al—Cu—Si, WSix, Ti, W, Mo, Ta, and TiW, in an example embodiment of the present invention.
The phase change material 214 is a chalcogenide material containing at least one element from column V or VI of the Periodic Table of the Elements. The phase change material 214 is one of Ge—Sb—Te, Ge—Bi—Te, As—Sb—Te, As—Ge—Sb—Te, Sn—Sb—Te, Sn—Sb—Te, In—Sn—Sb—Te, Ag—In—Sb—Te, GroupVA-Sb—Te, GroupVIA-Sb—Te, GroupVA-Sb—Se, GroupVIA-Sb—Se, Ge—Sb—Te—Si, As—Sb—Te—Si, As—Ge—Sb—Te—Si, Sn—Sb—Te—Si, In—Sn—Sb—Te—Si, Ag—In—Sb—Te—Si, GroupVA-Sb—Te—Si, GroupVIA-Sb—Te—Si, GroupVA-Sb—Se—Si, and GroupVIA-Sb—Se—Si, in an example embodiment of the present invention.
In this manner, HBr or HI used as an etchant includes bromine or iodine as the low reactivity halogen element. The term “low reactivity halogen element” is used herein to refer to a halogen element such as bromine and iodine that has lower reactivity with any material used for the top electrode material 216 than chlorine or fluorine.
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