Patent ID: 6630433
Filing Date: 2003-10-07
Classification: C09G,C23F,H01L

Abstract:
An etching solution for the planarization of a Cu/Ta/TaN surface comprising:an oxidizing reactant selected from the group consisting of H2O2, HNO3 and mixtures thereof; and, a co-reactant is selected from the group consisting of H3PO4, H2SO4, HNO3, oxalic acid, acetic acid, organic acids and mixtures thereof; and, other additives comprising of HCI, aliphatic alcohols, butylated hydroxytoluene, Agidol-2,2,6-di-tert-butyl-4[(dimethylamino)methyl]phenol, 2,6-di-tert-4N,N-dimethylaminomethyiphenol, borax, ethylene glycol, ZnSO4, methanol, propanol, poly(oxyethylene)lauryl ether, malic acid, HOOC(CX2)nCOOH wherein X=OH, amine, H and n=1-4), 3% tartaric acid, 1% ethylene glycol, 1,2,4-triazole, 1,2,3-triazole, tetrazole, nonionic surfactant, ethanol, triflouroethanol, SiF6, organic salt surfactant, polyvinyl alcohol, diphenylsulfamic acid, sodium oxalate, bezotriazole, sodium lignosulfonate, glycol, gelatin carboxymethylcellulose, amines, heavy metal salts, salts of Cu and Ta, KCl, CuCl2, SnCl2, propylene glycol, 2-ethylhexylamine, copper carbonate, low molecular weight alcohols, glycols, phenols, aliphatic alcohols, polyvinylalcohols, anionic surfactants, cationic surfactants, fluorocarbon-based surfactants, nonionic surfactants having the properties of preferentially adhering to certain materials, modifying thereby the chemical reactivity where so adhered, polyvinyl alcohol solution stabilizers and species inhibiting spontaneous decomposition of oxidizing agents, wetting agents and mixtures thereof; and abrasive particles comprising SiO2, Al2O3 metallic and solid elemental particles, polymer particles, oxides, carbides, fluorides, carbonates, borides, nitrides, hydroxides of Al, Ag, Au, Ca, Ce, Cr, Cu, Fe, Gd, Ge, La, In, Hf, Mn, Ng, Ni, Nd, Pb, Pt, P, Sb, Sc, Sn, Th, Ti, Ta, Th, Y, W, Zn, Zr, and mixtures thereof, wherein the particles have a size less than approximately 5 micrometers.