Neymar scored a late brace and set up Sergi Roberto for the decisive goal, having earlier won a penalty, to help Barca to their stunning 6-5 aggregate victory.
Unsurprisingly, the 25-year-old said he had never produced a better performance following his brace and pair of assists.
"Congratulations to the whole team because we believed until the end," Neymar told beIN Sports.
"This is the best game I've ever played."
Respeita nossa história, entendeu? pic.twitter.com/xIIjX7Fgvy— Neymar Jr (@neymarjr) March 8, 2017
While Barca, who lost the first leg 4-0, went 3-0 up on the night thanks to Luis Suarez, a Layvin Kurzawa own goal and a Lionel Messi penalty, Edinson Cavani appeared to put PSG back in command with an away goal.
The tie looked over with the hosts needing three goals in the dying stages, only for Neymar to score twice – once from the spot – before his chipped pass set up Roberto.
Neymar added: "If we believe, if we play, it is difficult to stop Barca.
"This can only happen once in a lifetime. Nobody thought we could score six and we did."