Fig. 1: Experimental schematic setup of UPCS.

The thin film perovskite photoconductive device is integrated into a microstrip transmission line structure to have a sub-25 ps time resolution ultrafast photocurrent, which is collected by a sampling oscilloscope. The ultrafast laser pulse duration is 130 fs. The top left panel is the MAPbI3 lattice structure and thin film cross section SEM image on glass substrate.