Mechanosynthesis of pure phase mixed-cation MA_xFA_1-xPbI₃ hybrid perovskite: photovoltaic performance and electrochemical properties

Daniel Prochowicz,^ab Pankaj Kumar Yadav,^a Michael Saliba,^a Marcin Saski,^b Shaik M. Zakeeruddin,^a Janusz Lewiński,^bc Michael Grätzel,^a

^a Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Interfaces, School of Basic Sciences, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
^b Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
^c Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland

DOI: 10.1039/C7SE00094D
First published online 12 Apr 2017.
Paper at Publisher's website

We report a facile mechanochemical route for the stabilization of a structurally stable α-FAPbI₃ perovskite by fine and controllable stoichiometry modification in mixed-cation (MA)_x(FA)_1-xPbI₃ perovskite. Moreover, the mechanoperovskite with a composition of (MA)_0.25(FA)_0.75PbI₃ was used for solar cells fabrication showing power conversion efficiency (PCE) of 14.98% with the high short circuit current (JSC) density at 23.7 mA/cm².