Just three minutes later, Les Parisiennes trimmed the lead to one through Marie-Antoinette Katoto, who forced the ball over the line after a goalmouth scramble.
After the break Barcelona pushed for another goal to completely kill the game. Jenni Hermoso - who scored in the first leg - forced a good save 20 minutes from time, while Marta Torrejon also went close. PSG meanwhile, struggled to rally with Barcelona holding out for the win.
The Blaugrana will meet Chelsea in the Champions League final after the Blues saw off Bayern Munich in the other semi-final. Fran Kirby grabbed a brace for the Blues, while Ji So-yun and Pernille Harder also scored to cancel out a fine strike from Sarah Zadrazil.
C1 dames: le Paris Saint-Germain éliminé en demi-finale face à Barcelone
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Chelsea to face Barcelona in Women s Champions League final
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The Super Falcons captain was handed a return as a second half substitute but she made the best of her opportunities on the pitch to rediscover their spark in the final third against the Danish champions.
With a 4-0 first leg lead, Barcelona continued from where they left off on a high, although only found a breakthrough in the 36th minute of the encounter courtesy of Aitana Bonmati s strike.
Four minutes after the restart, Bonmati doubled the visitors lead at Nord Energi Arena, with her second of the match before Mariona Caldentey scored from the spot to add the third in the 55th minute.
At Salamanca’s Helmantico Stadium, Cortes had Oshoala on the bench for Barcelona, just as Jose Sanchez kept the African duo of Ajibade and uncapped Nchout on the substitutes list.
After a goalless first-half, Atletico gained a shock lead in the 66th minute when Merel van Dongen converted from the penalty spot four minutes to the introduction of Oshoala by the Blaugranas.
On the brink of full time, Barcelona left it late to find their ways back into the contest thanks to Alexia Putellas strike from a free-kick to restore the parity and eventually force a stalemate.
In extra time, both teams created chances but goalkeeper Hedvig Lindahl made fantastic saves to deny Marta Torrejon and Putellas.