JP5852795B2 - 低温加圧焼結接合を含む2個の接合素子の構成体の製造方法 - Google Patents
低温加圧焼結接合を含む2個の接合素子の構成体の製造方法 Download PDFInfo
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- JP5852795B2 JP5852795B2 JP2011114547A JP2011114547A JP5852795B2 JP 5852795 B2 JP5852795 B2 JP 5852795B2 JP 2011114547 A JP2011114547 A JP 2011114547A JP 2011114547 A JP2011114547 A JP 2011114547A JP 5852795 B2 JP5852795 B2 JP 5852795B2
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- 238000005304 joining Methods 0.000 title claims description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 238000005245 sintering Methods 0.000 title claims description 11
- 238000000034 method Methods 0.000 claims description 30
- 239000003638 chemical reducing agent Substances 0.000 claims description 25
- 239000010953 base metal Substances 0.000 claims description 19
- 150000004706 metal oxides Chemical class 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 229910044991 metal oxide Inorganic materials 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 11
- 229910000510 noble metal Inorganic materials 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000007767 bonding agent Substances 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 239000007790 solid phase Substances 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 3
- 150000007522 mineralic acids Chemical class 0.000 claims description 3
- 150000007524 organic acids Chemical class 0.000 claims description 3
- 239000010970 precious metal Substances 0.000 claims description 3
- 238000000859 sublimation Methods 0.000 claims description 3
- 230000008022 sublimation Effects 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000007639 printing Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000000758 substrate Substances 0.000 description 20
- 239000004065 semiconductor Substances 0.000 description 12
- 238000010276 construction Methods 0.000 description 9
- 239000004020 conductor Substances 0.000 description 8
- 239000011810 insulating material Substances 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 235000003441 saturated fatty acids Nutrition 0.000 description 1
- 150000004671 saturated fatty acids Chemical class 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Description
・ その上に平面状の金属酸化物の層を含む卑金属からなる表面部分を有する第1接合素子を用意するステップ。
・ 第1接合素子の第1接触面として設けられるその表面部分の領域に還元剤を施与するステップ。この場合、この還元剤は液相または固相で施与するのが有利である。さらに、この還元剤そのものは、低温加圧焼結接合を形成するために、以下のさらなる製造工程において構成体に加えられる温度を超えることなくかつその温度より20Kまでだけ低い沸点または昇華点を有することが望ましい。基本的に、いくつかの有機酸または無機酸がこの目的に適している。
・ 焼結ペーストからなる層を還元剤に施与するステップ。この場合、接触面がなお完全に還元剤によってカバーされることが望ましい。低温加圧焼結接合形成用としての焼結ペーストは、好ましくは貴金属フレークと溶剤との混合物から構成される。
・ 焼結ペーストからなる層の上に第2接合素子の第2接触面を配置するステップ。
・ 材料密着結合の低温加圧焼結接合を形成するために構成体に温度および圧力を加えるステップ。この場合、最初に温度を加えて接合素子を少なくとも部分的に加熱してから、圧力を加えることが望ましい。
12 絶縁材料体
14 導体トラック
16 第1接触面
18 表面部分
20 金属酸化物の層
30 還元剤
40 焼結ペースト
42 焼結金属層
50 第2接合素子(パワー半導体素子)
52 金属化部分
54 電気接点面
56 第2接触面
58 表面部分
60 冷却部品(ヒートシンク)
66 接触面
68 表面
240 金属酸化物の層
Claims (9)
- 低温加圧焼結接合によって相互に材料密着結合で接合される第1接合素子(10)と第2接合素子(50)を含む構成体の製造方法であって、
前記両方の接合素子(10、50)は、それぞれ、表面部分(18、58、68)の一部として、もう一方のそれぞれの前記接合素子に接合されるべき接触面(16、56、66)を有し、
それら接触面(16、56、66)の間には貴金属含有接合剤(42)が配置され、かつ、
少なくとも一方の接合素子(10)の前記表面部分(18)は卑金属から構成され、
この卑金属は、前記接触面(16)に隣接する領域に金属酸化物の層(240)を有する一方、前記接触面そのものは、金属として、すなわち金属酸化物の層を含まないように形成され、それによって、前記接合剤(42)と直接接触し、
・平面状の金属酸化物の層(20)を備え卑金属からなる表面部分(18)を有する第1接合素子(10)を用意するステップと、
・前記第1接合素子(10)の第1接触面(16)として設けられる前記表面部分(18)の領域に還元剤(30)を施与するステップと、
・前記還元剤(30)に焼結ペースト(40)からなる層を施与するステップと、
・前記焼結ペースト(40)からなる層の上に第2接合素子(50)の第2接触面(56)を配置するステップと、
・材料密着結合の低温加圧焼結接合を形成するために、構成体に温度および圧力を加えるステップと、
を含むことを特徴とする、方法。 - 前記接合剤(42)中の貴金属の質量分率が80%〜99%の間である、請求項1に記載の方法。
- 前記接合剤(42)の主たる部分が金属の銀である、請求項1または2に記載の方法。
- 前記卑金属がアルミニウム、銅または銅合金である、請求項1に記載の方法。
- 前記還元剤(30)が無機酸、又は、有機酸である、請求項1に記載の方法。
- 前記圧力を加える操作が、前記温度を加える操作が開始された後に開始される、請求項1に記載の方法。
- 貴金属フレークおよび溶剤から構成される前記焼結ペースト(40)が、ステンシル印刷法またはスプレー法によって施与される、請求項1に記載の方法。
- 前記還元剤(30)が固相または液相で施与される、請求項1に記載の方法。
- 前記還元剤(30)が、低温加圧焼結接合を形成するために、構成体に加えられる温度を超えることなくかつその温度より20Kまでだけ低い沸点または昇華点を有する、請求項1に記載の方法。
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