US 12,168,837 B2
Tin-silver plating solution and method for forming tin-silver solder bump by using same
Min Hyung Lee, Incheon (KR); Woon Young Lee, Incheon (KR); Sang Hoon Jin, Seoul (KR); Yu Geun Jo, Incheon (KR); and Dong Ryul Lee, Incheon (KR)
Assigned to Korea Institute of Industrial Technology, Cheonan-si (KR); and Dongwoo Fine-Chem Co., Ltd., Iksan-si (KR)
Appl. No. 18/253,540
Filed by KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY, Cheonan-si (KR); and DONGWOO FINE-CHEM CO., LTD., Iksan-si (KR)
PCT Filed Nov. 17, 2021, PCT No. PCT/KR2021/016859
§ 371(c)(1), (2) Date May 18, 2023,
PCT Pub. No. WO2022/108325, PCT Pub. Date May 27, 2022.
Claims priority of application No. 10-2020-0157071 (KR), filed on Nov. 20, 2020; and application No. 10-2021-0138109 (KR), filed on Oct. 18, 2021.
Prior Publication US 2023/0407508 A1, Dec. 21, 2023
Int. Cl. C25D 3/60 (2006.01); C25D 3/64 (2006.01); C25D 5/02 (2006.01); H01L 23/00 (2006.01)
CPC C25D 3/60 (2013.01) [H01L 24/11 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A tin-silver plating solution comprising: a source of tin ions; a source of silver ions (Ag+); and an organic additive,
wherein the organic additive includes a silver (Ag) complexing agent represented by the following Chemical Formula 1, a tin carrier represented by the following Chemical Formula 2, and a crystal grain refiner represented by the following Chemical Formula 3:

OG Complex Work Unit Chemistry
where A1 is a linear alkylene having 1 to 10 carbon atoms and R1 and R2 are each independently a functional group containing any one or more of carbon, oxygen, nitrogen, sulfur, or silicon;

OG Complex Work Unit Chemistry
where
A2 is an unsubstituted C6 to C30 aryl group or a heteroaryl group having 6 to 30 ring atoms including a hetero atom in which one or more ring carbon atoms are each composed of any one or more of nitrogen, oxygen, or sulfur,
R3 is any one of hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C3 to C30 cycloalkyl group, a substituted or unsubstituted C2 to C30 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, a substituted or unsubstituted C1 to C30 alkoxy group, a hydroxyl group, a sulfonate group having an ionic bond with an alkali metal cation, a phosphonate group having an ionic bond with an alkali metal cation, a nitronate group having an ionic bond with an alkali metal cation, or a carboxylate group having an ionic bond with an alkali metal cation, and n1 to n4 are each independently an integer of 0 to 26, provided that a sum of n1 to n4 is 10 to 26; and

OG Complex Work Unit Chemistry
where R4 is hydrogen, a linear alkyl having 1 to 20 carbon atoms, a branched alkyl having 5 to 20 carbon atoms, or a linear alkyl having 1 to 7 carbon atoms including a hydroxyl group,
R5 is hydrogen, a linear alkyl having 1 to 20 carbon atoms, a branched alkyl having 5 to 20 carbon atoms, or a linear alkyl having 1 to 7 carbon atoms including a hydroxyl group,
R6 is hydrogen, a linear alkyl having 1 to 20 carbon atoms, or a branched alkyl having 5 to 20 carbon atoms,
R7 is hydrogen, a linear alkyl having 1 to 20 carbon atoms, or a branched alkyl having 5 to 20 carbon atoms, and
X is any one selected from the ion group consisting of chlorine (Cl), bromine (Br), iodine (I), a nitrate (NO3), a sulfate (SO4), a carbonate (CO3), and a hydroxyl group (OH).