Thin film transistor array panel and method for manufacturing the same

A thin film transistor array panel includes: a substrate; a signal line disposed on the substrate and including copper (Cu); a passivation layer disposed on the signal line and having a contact hole exposing a portion of the signal line; and a conductive layer disposed on the passivation layer and connected to the portion of the signal line through the contact hole, wherein the passivation layer includes an organic passivation layer including an organic insulator that does not include sulfur, and a method of manufacturing the thin film transistor prevents formation of foreign particles on the signal line.