Contacting means and method for contacting electrical components
View Patent ↗A method is provided for connecting at least two components, in which a sintering preform is used. This preform includes a carrier having a surface that has at least one structuring element containing hardened paste, wherein the hardened paste contains: (a) metal particles having a coating that contains at least one organic compound; and (b) at least one sintering aid selected from the group consisting of (b1) organic peroxides, (b2) inorganic peroxides, (b3) inorganic acids, (b4) salts of organic acids, wherein the organic acids have 1-4 carbon atoms, (b5) esters of organic acids, wherein the organic acids have 1-4 carbon atoms, and (b6) carbonyl complexes. The surface of the carrier having the hardened paste is not reactive to the constituents of the paste.
1. A sintering preform comprising a carrier having a surface, the surface having at least one structuring element containing hardened paste, wherein the hardened paste consists essentially of:
(a) metal particles having a coating that contains at least one organic compound;
(b) at least one sintering aid selected from the group consisting of (b1) organic peroxides, (b2) inorganic peroxides, (b3) inorganic acids, (b4) salts of organic acids, wherein the organic acids have 1-4 carbon atoms, (b5) esters of organic acids, wherein the organic acids have 1-4 carbon atoms, and (b6) carbonyl complexes, and
(c) optionally at least one metal precursor;
and wherein the surface of the carrier having the hardened paste is not reactive to the constituents of the paste.
2. The sintering preform according to claim 1 , wherein the metal particles are silver particles.
3. The sintering preform according to claim 1 , wherein the at least one organic compound of the coating is selected from the group consisting of fatty acids, fatty acid salts, and fatty acid esters.
4. The sintering preform according to claim 1 , wherein a molar ratio of sintering aids to the organic compounds contained in the coating lies in a range of 1:1 to 150:1.
5. The sintering preform according to claim 1 , wherein the at least one sintering aid comprises an organic peroxide selected from the group consisting of diisobutyryl peroxide, cumene peroxyneodecanoate, 1,1,3,3-tetramethylbutyl peroxyneodecanoate, di-n-propyl peroxydicarbonate, tert-amyl-peroxyneodecanoate, di-(2-ethylhexyl)-peroxydicarbonate, tert-butyl peroxyneodecanoate, di-n-butyl peroxydicarbonate, 1,1,3,3-tetramethylbutyl peroxypivalate, tert-butyl peroxyneoheptanoate, tert-amyl peroxypivalate, tert-butyl peroxypivalate, di-(3,5,5-trimethylhexanoyl) peroxide, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxyisobutyrate, 1,1-di-(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-di-(tert-butylperoxy)-cyclohexane, tert-butyl-peroxy-3,5,5-trimethylhexanoate, 2,2-di-(tert-butylperoxy)-butane, tert-butylperoxyisopropylcarbonate, tert-butyl peroxyacetate, 2,5-dimethyl-2,5-di(2-ethylhexanoylperoxy)-hexane, 1,1,3,3-tetramethylbutyl-peroxy-2-ethylhexanoate, tert-amyl-peroxy-2-ethylhexanoate, tert-butyl peroxydiethylacetate, tert-amyl-peroxy-2-ethylhexylcarbonate, tert-butyl-peroxy-2-ethylhexylcarbonate,tert-butyl peroxybenzoate, di-tert amylperoxide, 2,5-dimethyl-2,5-di-(tert-butylperoxy)-hexane, tert-butylcumyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3, di-tert-butyl peroxide, 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxonane, di-isopropylbenzene monohydroperoxide, p-menthane hydroperoxide, cumene hydroperoxide, dicumyl peroxide, and 1,1,3,3- tetramethylbutyl hydroperoxide.
6. The sintering preform according to claim 1 , wherein the at least one sintering aid comprises an inorganic peroxide selected from the group consisting of hydrogen peroxide, ammonium peroxide, lithium peroxide, sodium peroxide, potassium peroxide, magnesium peroxide, calcium peroxide, barium peroxide, and peroxoborates.
7. The sintering preform according to claim 1 , wherein the at least one sintering aid comprises an inorganic acid comprising a phosphoric acid.
8. The sintering preform according to claim 1 , wherein the at least one sintering aid comprises a salt of an organic acid selected from the group consisting of acetates, carbonates, formates, lactates, and oxalates.
9. The sintering preform according to claim 1 , wherein the at least one sintering aid comprises a salt of an organic acid selected from the group consisting of magnesium formate, aluminum formate, iron(II) formate, tin(II) formate, copper(II) formate, silver(II) formate, and manganese(III) formate.
10. The sintering preform according to claim 1 , wherein the at least one sintering aid comprises a salt of an organic acid selected from the group consisting of copper(II) lactate and silver(I) lactate.
11. The sintering preform according to claim 1 , wherein the at least one sintering aid comprises an ester of an organic acid selected from the group consisting of methyl formate, ethyl formate, propyl formate, and butyl formate.
12. The sintering preform according to claim 1 , wherein the at least one sintering aid comprises a carbonyl complex selected from the group consisting of metal carbonyls.
13. The sintering preform according to claim 1 , wherein a foil is applied on the at least one structuring element that contains the hardened paste.