Electroless deposition method over sub-micron apertures
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C23C-028/00
B05D-005/12
출원번호
US-0059822
(2002-01-28)
발명자
/ 주소
Gandikota, Srinivas
McGuirk, Chris R.
Padhi, Deenesh
Malik, Muhammad Atif
Ramanathan, Sivakami
Dixit, Girish A.
Cheung, Robin
출원인 / 주소
Applied Materials, Inc.
대리인 / 주소
Moser, Patterson & Sheridan
인용정보
피인용 횟수 :
23인용 특허 :
62
초록▼
An apparatus and a method of depositing a catalytic layer comprising at least one metal selected from the group consisting of noble metals, semi-noble metals, alloys thereof, and combinations thereof in sub-micron features formed on a substrate. Examples of noble metals include palladium and platinu
An apparatus and a method of depositing a catalytic layer comprising at least one metal selected from the group consisting of noble metals, semi-noble metals, alloys thereof, and combinations thereof in sub-micron features formed on a substrate. Examples of noble metals include palladium and platinum. Examples of semi-noble metals include cobalt, nickel, and tungsten. The catalytic layer may be deposited by electroless deposition, electroplating, or chemical vapor deposition. In one embodiment, the catalytic layer may be deposited in the feature to act as a barrier layer to a subsequently deposited conductive material. In another embodiment, the catalytic layer may be deposited over a barrier layer. In yet another embodiment, the catalytic layer may be deposited over a seed layer deposited over the barrier layer to act as a “patch” of any discontinuities in the seed layer. Once the catalytic layer has been deposited, a conductive material, such as copper, may be deposited over the catalytic layer. In one embodiment, the conductive material is deposited over the catalytic layer by electroless deposition. In another embodiment, the conductive material is deposited over the catalytic layer by electroless deposition followed by electroplating or followed by chemical vapor deposition. In still another embodiment, the conductive material is deposited over the catalytic layer by electroplating or by chemical vapor deposition.
대표청구항▼
1. A method of depositing a conductive material in a sub-micron feature formed on a substrate structure of a substrate, comprising:depositing a catalytic layer by electroless deposition, the catalytic layer comprising a metal selected from the group consisting of a noble metal, a semi-noble metal, a
1. A method of depositing a conductive material in a sub-micron feature formed on a substrate structure of a substrate, comprising:depositing a catalytic layer by electroless deposition, the catalytic layer comprising a metal selected from the group consisting of a noble metal, a semi-noble metal, and combinations thereof and comprising a Group IV metal; anddepositing a conductive material layer to a thickness of less than about 500 Å over the catalytic layer by electroless deposition, wherein the semi-noble metal comprises a metal selected from the group consisting of cobalt, nickel, and tungsten. 2. The method of claim 1, wherein depositing the conductive material layer comprises depositing the conductive material layer to a thickness of less than about 300 Å. 3. The method of claim 1, further comprising depositing a second conductive material layer over the conductive material layer. 4. The method of claim 1, wherein the catalytic layer is deposited over the substrate structure, wherein the catalytic layer acts as a barrier layer. 5. The method of claim 1, further comprising depositing a barrier layer over the substrate structure and then depositing the catalytic layer over the barrier layer. 6. The method of claim 1, further comprising depositing a barrier layer over the substrate structure and depositing a conductive seed layer over the barrier layer and then depositing the catalytic layer over the conductive seed layer. 7. The method of claim 1, wherein the Group IV metal comprises tin. 8. The method of claim 1, wherein the noble metal comprises a metal selected the group consisting of palladium and platinum. 9. The method of claim 1, wherein depositing the catalytic layer comprises contacting the substrate structure with an electroless deposition solution comprising Group IV metal ions and comprising metal ions selected from the group consisting of noble metal ions, semi-noble metal ions, and combinations thereof. 10. The method of claim 1, wherein the catalytic layer is deposited to a thickness between about 5 Å to about 100 Å. 11. The method of claim 1, wherein depositing the catalytic layer comprises contacting the substrate structure with a first electroless deposition solution comprising Group IV metal ions, and contacting the substrate structure with a second electroless deposition solution comprising noble metal ions, semi-noble metal ions, and combinations thereof. 12. The method of claim 1, further comprising rinsing the catalytic layer with at least one rinsing solution selected from the group consisting of deionized water, hot deionized water, caustic solution, hot caustic solution, salt solutions, and hot salt solutions. 13. The method of claim 1, wherein depositing the conductive material layer comprises electroless deposition of a copper layer by contacting the substrate structure with a copper electroless deposition solution comprising copper ions. 14. The method of claim 1, wherein depositing the catalytic layer comprises providing an electroless deposition solution at a point-of-use. 15. The method of claim 1, wherein depositing the conductive material layer comprises providing an electroless deposition solution at a point-of-use. 16. A method of depositing a catalytic layer in a sub-micron feature formed on a substrate structure of a substrate, comprising:contacting the substrate structure with an electroless deposition solution comprising Group IV metal ions and comprising metal ions selected from the group consisting of a noble metal, a semi-noble metal, and combinations thereof for a time period of between about 30 seconds and about 120 seconds at a reaction temperature between about 20° C. to about 150° C., wherein the semi-noble metal comprises a metal selected from the group consisting of cobalt, nickel, and tungsten. 17. The method of claim 16, wherein the Group IV metal comprises tin. 18. The method of claim 16, wherein the noble metal comprises a metal se lected the group consisting of palladium and platinum. 19. The method of claim 16, contacting the substrate structure with the electroless deposition solution comprises contacting the substrate structure with between about 3 ml and about 200 ml of the electroless deposition solution for a 200 mm substrate. 20. The method of claim 16, wherein the electroless deposition solution is acidic. 21. The method of claim 16, wherein the electroless deposition is at an initial pH of less than or equal to about 1. 22. The method of claim 16, where the electroless deposition comprises tin ions and palladium ions. 23. The method of claim 22, wherein the electroless deposition solution comprises between about 0.3 g/L to about 1.4 g/L of Pd; between about 15 g/L to about 60 g/L of Sn; and about 20% to about 60% by volume of a strong acid. 24. The method of claim 23, wherein the electroless deposition solution comprises between 25 to about 30 g/L of Sn. 25. The method of claim 23, wherein the electroless deposition solution comprises between about 30% to 40% by volume of a strong acid. 26. The method of claim 22, wherein contacting the substrate structure with the electroless deposition solution is performed at a reaction temperature between about 20° C. and 80° C. 27. The method of claim 22, wherein contacting the substrate structure with the electroless deposition solution is performed at a reaction temperature between about 40° C. and about 60° C. 28. The method of claim 16, further comprising rinsing the catalytic layer with at least one rinsing solution selected from the group consisting of deionized water, hot deionized water, caustic solution, hot caustic solution, salt solutions, and hot salt solutions. 29. The method of claim 28, wherein rinsing the catalytic layer comprises rinsing the catalytic layer with hot deionized water at a temperature between about 70° C. to about 100° C. 30. The method of claim 29, wherein rinsing the catalytic layer further comprises rinsing the catalytic layer with an acidic solution after rinsing the substrate with hot deionized water. 31. A method of depositing a catalytic layer in a sub-micron feature formed on a substrate structure of a substrate, comprising:contacting the substrate structure with a first electroless deposition solution comprising Group IV metal ions; andcontacting the substrate structure with a second electroless deposition solution comprising metal ions selected from the group consisting of noble metal ions, semi-noble metal ions, and combinations thereof, wherein the semi-noble metal comprises a metal selected from the group consisting of cobalt, nickel, and tungsten. 32. The method of claim 31, wherein the Group IV metal comprises tin. 33. The method of claim 31, wherein the noble metal comprises a metal selected the group consisting of palladium and platinum. 34. The method of claim 31, wherein the first electroless deposition solution is acidic. 35. The method of claim 31, wherein the second electroless deposition solution is acidic. 36. The method of claim 31, wherein contacting the substrate structure with the first electroless deposition solution comprises contacting the substrate structure with the first solution at a reaction temperature between about 20° C. and about 150° C. 37. The method of claim 31, wherein contacting the substrate structure with the first electroless deposition solution comprises contacting the substrate structure with the first electroless deposition solution at a reaction temperature between about 20° C. and about 50° C. 38. The method of claim 31, wherein contacting the substrate structure with the first electroless deposition solution comprising contacting the substrate structure with the first electroless deposition solution for a time period between about 30 seconds to about 120 seconds. 39. The method of claim 31, wherein contacting the substrate structure with the first electroless deposition sol ution comprises contacting the substrate structure with between about 3 ml and about 200 ml of the first electroless deposition solution for a 200 mm substrate. 40. The method of claim 31, further comprising rinsing the substrate between contacting the substrate structure with the first electroless deposition solution and contacting the substrate structure with the second electroless deposition solution, rinsing the substrate comprising contacting the substrate structure with at least one rinsing solution selected from the group consisting of deionized water, hot deionized water, caustic solution, hot caustic solution, salt solutions, and hot salt solutions. 41. The method of claim 31, wherein contacting the substrate structure with the second electroless deposition solution comprises contacting the substrate structure with the second electroless deposition solution at a reaction temperature between about 20° C. to about 150° C. 42. The method of claim 31, wherein contacting the substrate structure with the second electroless deposition solution comprises contacting the substrate structure with the second electroless deposition solution for a time period of about 30 seconds to about 120 seconds. 43. The method of claim 31, wherein contacting the substrate structure with the second electroless deposition solution comprises contacting the substrate structure with between about 3 ml and about 200 ml of the second electroless deposition solution for a 200 mm substrate. 44. The method of claim 31, further comprising rinsing the catalytic layer with at least one rinsing solution selected from the group consisting of deionized water, hot deionized water, caustic solution, hot caustic solution, salt solutions, and hot salt solutions. 45. The method of claim 44, wherein rinsing the catalytic layer comprises rinsing the catalytic layer with hot deionized water at a temperature between about 70° C. to about 100° C. 46. The method of claim 45, wherein rinsing the catalytic layer further comprises rinsing the catalytic layer with an acidic solution after rinsing the substrate with hot deionized water. 47. A method of depositing a conductive material layer in a sub-micron feature formed on a substrate structure of a substrate, comprising:depositing a copper layer to a thickness less than 500 Å by electroless deposition, electroless deposition comprising contacting the substrate structure with a copper electroless deposition solution comprising copper ions, wherein the copper electroless deposition solution is at an initial acidic pH. 48. The method of claim 47, wherein the copper electroless deposition solution is adjusted to a pH of above about 11. 49. The method of claim 47, wherein the copper electroless deposition solution is formaldehyde-free. 50. The method of claim 47, wherein contacting the substrate structure with the copper electroless deposition solution is performed at a reaction temperature between about 20° C. and about 100° C. 51. The method of claim 47, wherein contacting the substrate structure with the copper electroless deposition solution is performed at a reaction temperature between about 40° C. and 80° C. 52. The method of claim 47, wherein contacting the substrate structure with the copper electroless deposition solution is performed for a time period between about 45 seconds to about 120 seconds. 53. The method of claim 50, wherein the copper layer is deposited to a thickness between about 50 Å to about 300 Å. 54. The method of claim 47, wherein depositing the copper layer comprises providing the copper electroless deposition solution at a point-of-use. 55. The method of claim 47, wherein the copper electroless deposition solution further comprises additives selected from the group consisting of accelerators, suppressors, levelers, and combinations thereof. 56. A method of depositing a conductive material in a sub-micron feature formed on a substrate struc ture, comprising:depositing a catalytic layer by electroless deposition, the catalytic layer comprising a metal selected from the group consisting of a noble metal, a semi-noble metal, and combinations thereof and a-comprising a Group IV metal;depositing a conductive material layer over the catalytic layer by electroless deposition; andannealing the substrate structure. 57. The method of claim 56, wherein annealing the substrate structure comprises annealing the catalytic layer. 58. The method of claim 55, wherein annealing the substrate structure comprises heating the substrate structure to a substrate temperature between about 100° C. to about 400° C. 59. The method of claim 57, wherein annealing comprises annealing in a vacuum atmosphere. 60. The method of claim 57, wherein annealing comprises annealing in a gas atmosphere. 61. The method of claim 57, annealing comprises annealing in a non-hydrogen atmosphere and annealing in a hydrogen gas atmosphere. 62. The method of claim 56, wherein annealing the substrate structure comprises annealing the conductive material layer. 63. The method of claim 62, wherein annealing the substrate comprises heating the substrate structure to a substrate temperature between about 100° C. to about 400° C. 64. The method of claim 62, wherein annealing comprises annealing in a vacuum atmosphere. 65. The method of claim 62, wherein annealing comprises annealing in a gas atmosphere. 66. The method of claim 62, wherein annealing comprises annealing in a non-hydrogen atmosphere and annealing in a hydrogen gas atmosphere. 67. The method of claim 56, further comprising depositing a second conductive material layer over the conductive material layer by electroplating. 68. The method of claim 56, further comprising depositing a second conductive material layer over the conductive material layer by chemical vapor deposition. 69. The method of claim 56, wherein depositing the conductive material comprises filling the feature. 70. The method of claim 56, wherein the catalytic layer is deposited over the substrate structure, wherein the catalytic layer acts as a barrier layer. 71. The method of claim 56, further comprising depositing a barrier layer over the substrate structure and then depositing the catalytic layer over the barrier layer. 72. The method of claim 56, further comprising depositing a barrier layer over the substrate structure and depositing a conductive seed layer over the barrier layer and then depositing the catalytic layer over the conductive seed layer. 73. The method of claim 56, wherein the Group IV metal comprises tin. 74. The method of claim 56, wherein the noble metal comprises a metal selected the group consisting of palladium and platinum. 75. The method of claim 56, wherein the semi-noble metal comprises a metal selected from the group consisting of cobalt, nickel, and tungsten. 76. The method of claim 56, wherein depositing the catalytic layer comprises contacting the substrate structure with an electroless deposition solution comprising Group IV metal ions and comprising metal ions selected from the group consisting of noble metal ions, semi-noble metal ions, and combinations thereof. 77. The method of claim 56, wherein depositing the catalytic layer comprises contacting the substrate structure with a first electroless deposition solution comprising Group IV metal ions, and contacting the substrate structure with a second electroless deposition solution comprising noble metal ions, semi-noble metal ions, and combinations thereof. 78. A method of depositing a conductive material in a sub-micron feature formed on a substrate structure of a substrate comprising:depositing a catalytic layer by electroless deposition, the catalytic layer comprising a metal selected from the group consisting of a noble metal, a semi-noble metal, and combinations thereof and comprising a Group IV metal;depositing a copper layer over the catalytic layer by electroless deposition; an dbiasing the substrate structure. 79. The method of claim 78, wherein biasing the substrate structure comprises biasing the substrate structure during depositing the catalytic layer. 80. The method of claim 78, wherein biasing the substrate structure comprises biasing the substrate structure during depositing the copper layer. 81. The method of claim 78, wherein biasing the substrate structure comprises coupling a positive pole of a power supply to a conductive portion of the substrate structure and coupling a negative pole of the power supply to an electrode in contact with an electroless deposition solution. 82. The method of claim 81, wherein the power supply provides a cell potential of less than +0.337 V. 83. The method of claim 78, wherein biasing the substrate comprises coupling a negative pole of a power supply to a conductive portion of the substrate structure and coupling a positive pole of the power supply to an electrode in contact with an electroless deposition solution. 84. The method of claim 83, wherein the power supply provides a cell potential of less than +0.337 V. 85. The method of claim 83, wherein biasing the substrate structure comprises applying a bias for a time period between about a millisecond and about one second. 86. The method of claim 83, wherein biasing the substrate structure comprises applying a bias for a time period of least one second. 87. The method of claim 78, wherein biasing the substrate structure comprises coupling one pole of a power supply to a conductive portion of the substrate and coupling another pole of the power supply to an electrode in contact with an electroless deposition solution and comprises reversing the polarity of the power supply back and forth. 88. The method of claim 78, further comprising depositing a second copper layer over the copper layer by electroplating. 89. The method of claim 78, further comprising depositing a second copper layer over the copper layer by chemical vapor deposition. 90. The method of claim 78, wherein depositing the copper layer comprises filling the feature. 91. The method of claim 78, wherein the Group IV metal comprises tin. 92. The method of claim 78, wherein the noble metal comprises a metal selected the group consisting of palladium and platinum. 93. The method of claim 78, wherein the semi-noble metal comprises a metal selected from the group consisting of cobalt, nickel, tungsten, and combinations thereof. 94. The method of claim 78, wherein depositing the catalytic layer comprises contacting the substrate structure with an electroless deposition solution comprising Group IV metal ions and comprising metal ions selected from the group consisting of noble metal ions, semi-noble metal ions, and combinations thereof. 95. The method of claim 78, wherein depositing the catalytic layer comprises contacting the substrate structure with a first electroless deposition solution comprising Group IV metal ions, and contacting the substrate structure with a second electroless deposition solution comprising noble metal ions, semi-noble metal ions, and combinations thereof. 96. A method of depositing a conductive material in a sub-micron feature formed on a substrate structure of a substrate, comprising:depositing a catalytic layer by electroless deposition, the catalytic layer comprising a metal selected from the group consisting of a noble metal, a semi-noble metal, and combinations thereof and comprising a Group IV metal;depositing a conductive material layer to a thickness of less than about 500 Å over the catalytic layer by electroless deposition; anddepositing a second conductive material layer over the conductive material layer. 97. A method of depositing a conductive material in a sub-micron feature formed on a substrate structure of a substrate, comprising:depositing a barrier layer over the substrate structure and then depositing a catalytic layer over the barrier layer by electroless deposition, the catalytic layer comprising a metal selected from the group consisting of a noble metal, a semi-noble metal, and combinations thereof and comprising a Group IV metal; anddepositing a conductive material layer to a thickness of less than about 500 Å over the catalytic layer by electroless deposition. 98. A method of depositing a conductive material in a sub-micron feature formed on a substrate structure of a substrate, comprising:depositing a barrier layer over the substrate structure;depositing a conductive seed layer over the barrier layer and then depositing a catalytic layer over the conductive seed layer by electroless deposition, the catalytic layer comprising a metal selected from the group consisting of a noble metal, a semi-noble metal, and combinations thereof and comprising a Group IV metal; anddepositing a conductive material layer to a thickness of less than about 500 Å over the catalytic layer by electroless deposition. 99. A method of depositing a conductive material in a sub-micron feature formed on a substrate structure of a substrate, comprising:depositing a catalytic layer by electroless deposition, the catalytic layer comprising a metal selected from the group consisting of a noble metal, a semi-noble metal, and combinations thereof and comprising a Group IV metal; anddepositing a conductive material layer to a thickness of less than about 500 Å over the catalytic layer by electroless deposition, wherein the catalytic layer is deposited to a thickness between about 5 Å to about 100 Å. 100. A method of depositing a catalytic layer in a sub-micron feature formed on a substrate structure of a substrate, comprising:contacting the substrate structure with an electroless deposition solution comprising Group IV metal ions and comprising metal ions selected from the group consisting of a noble metal, a semi-noble metal, and combinations thereof for a time period of between about 30 seconds and about 120 seconds at a reaction temperature between about 20° C. to about 150° C., wherein contacting the substrate structure with the electroless deposition solution comprises contacting the substrate structure with between about 3 ml and about 200 ml of the electroless deposition solution for a 200 mm substrate. 101. A method of depositing a catalytic layer in a sub-micron feature formed on a substrate structure of a substrate, comprising:contacting the substrate structure with a first electroless deposition solution comprising Group IV metal ions; andcontacting the substrate structure with a second electroless deposition solution comprising metal ions selected from the group consisting of noble metal ions, semi-noble metal ions, and combinations thereof, wherein contacting the substrate structure with the first electroless deposition solution comprises contacting the substrate structure with between about 3 ml and about 200 ml of the first electroless deposition solution for a 200 mm substrate. 102. A method of depositing a catalytic layer in a sub-micron feature formed on a substrate structure of a substrate, comprising: contacting the substrate structure with a first electroless deposition solution comprising Group IV metal ions; andcontacting the substrate structure with a second electroless deposition solution comprising metal ions selected from the group consisting of noble metal ions, semi-noble metal ions, and combinations thereof, wherein contacting the substrate structure with the second electroless deposition solution comprises contacting the substrate structure with between about 3 ml and about 200 ml of the second electroless deposition solution for a 200 mm substrate.
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이 특허에 인용된 특허 (62)
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