A Versatile Ionic Liquid Additive for Perovskite Solar Cells: Surface Modification, Hole Transport Layer Doping, and Green Solvent Processing. - Jeong, Seong‐Jin; Park, Sung Hwan; Yun, Siwon; Li, Meng Qiang; Kim, Dasol; Kim, Yongchan; Chang, Yun Hee; Lee, Jaewon; Lim, Jongchul; Yang, Tae‐Youl (Advanced Science, 2025)