Monitoring hot exciton dissociation in hybrid lead halide perovskite films with sub-10 fs pulses Tufan Ghosh, Sigalit Aharon, Lioz Etgar and Sanford Ruhman EPJ Web Conf., 205 (2019) 06019 Published online: 16 April 2019 DOI: 10.1051/epjconf/201920506019