Carrier Extraction from Perovskite to Polymeric Charge Transport Layers Probed by Ultrafast Transient Absorption Spectroscopy - Ugur, E; Khan, JI; Aydin, E; Wang, M; Kirkus, M; Neophytou, M; McCulloch, I; De, Wolf S; Laquai, F (JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 2019)