title: Revealing the ultrafast charge carrier dynamics in organo metal halide perovskite solar cell materials using time resolved THz spectroscopy.
abstract: Ultrafast charge carrier dynamics in organo metal halide perovskite has been probed using time resolved terahertz (THz) spectroscopy (TRTS). Current literature on its early time characteristics is unanimous: sub-ps charge carrier generation, highly mobile charges and very slow recombination rationalizing the exceptionally high power conversion efficiency for a solution processed solar cell material. Electron injection from MAPbI3 to nanoparticles (NP) of TiO2 is found to be sub-ps while Al2O3 NPs do not alter charge dynamics. Charge transfer to organic electrodes, Spiro-OMeTAD and PCBM, is sub-ps and few hundreds of ps respectively, which is influenced by the alignment of energy bands. It is surmised that minimizing defects/trap states is key in optimizing charge carrier extraction from these materials.
authors.affiliation: Division of Chemical Physics, Lund University, Getingevagen 60, Lund, Sweden. carlito.ponseca@chemphys.lu.se.
authors.forename: C S
authors.initials: CS
authors.lastname: Ponseca
authors.affiliation: Division of Chemical Physics, Lund University, Getingevagen 60, Lund, Sweden. carlito.ponseca@chemphys.lu.se.
authors.forename: V
authors.initials: V
authors.lastname: Sundström