Title : Irreducible Specht modules Abstract: I'd like to talk about irreducible Specht modules over Iwahori-Hecke algebras of type A at roots of 1. In this research field, the following very basic question isn't settled yet: When is a Specht module irreducible? M. Fayers made a good progress on this problem using so-called Rouquier blocks decomposition numbers, determined by Chuang-Tan and Leclerc-Miyachi independently. Along this Fayers's approach, James, Lyle and Mathas proceed its analogue in some mixed cases. We provide a new approach to find some irreducible Specht modules over Iwahori-Hecke algebras of type A at roots of 1 in characteristic zero. Our approach here is based on [1] Lusztig's divided power quantum groups at roots of 1 in characteristic zero and [2] endomorphism ring structures of some Young modules.