Conductive paste
A conductive paste, for forming an electrode of a solar cell, includes (A) a conductive component, (B) an epoxy resin, (C) an imidazole and (D) a solvent. An amount of (C) the imidazole in the conductive paste is 0.1 to 1.0% by weight based on 100% by weight of the conductive paste excluding (D) the solvent.
1. A conductive paste for forming a solar cell, wherein the conductive paste comprises (A) a conductive component, (B) an epoxy resin, (C) an imidazole, (D) a solvent, and (E) a phenol resin,
wherein an amount of (C) the imidazole in the conductive paste is 0.1 to 1.0% by weight based on 100% by weight of the conductive paste excluding (D) the solvent,
wherein (C) the imidazole contains at least one imidazole selected from imidazoles of the following formula (1) and formula (2):
and
wherein (B) the epoxy resin comprises a bisphenol F type epoxy resin, a biphenyl type epoxy resin and a bisphenol A type epoxy resin.
2. The conductive paste according to claim 1 , wherein (D) the solvent comprises ethyl diglycol monophenyl ether or diethylene glycol monobutyl ether.
3. The conductive paste according to claim 1 , which further comprises (F) a coupling agent.
4. The conductive paste according to claim 1 , wherein (D) the solvent comprises diethylene glycol monobutyl ether acetate.
5. The conductive paste according to claim 1 , wherein (A) the conductive component comprises conductive particles of at least one selected from silver, copper, nickel, aluminum, zinc and tin.
6. The conductive paste according to claim 1 , wherein (A) the conductive component contained in the conductive paste is 75 to 98% by weight based on the whole conductive paste.
7. The conductive paste according to claim 1 , wherein (E) the phenol resin contained in the conductive paste is 1.56 to 1.76% by weight based on the total weight of (A) the conductive component, (B) the epoxy resin, (C) the imidazole, (E) the phenol resin and (F) a coupling agent.