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On the basis of experiment and theory, a general paradigm is drawn that reconsiders N2 not simply being an inert species but rather an effective healing gas molecule if entering a methylammonium lead iodide (MAPbI3) layer. Nitrogen is soaked into polycrystalline MAPbI3 via a postdeposition mild thermal treatment under slightly overpressure conditions to promote its diffusion across the whole layer. A significant reduction of radiative recombination and a concurrent increase of light absorption, with a maximum benefit at 80 °C, are observed. Concomitantly, the current of holes drawn from the surfaces with nanometer resolution through a biased tip is raised by a factor of 3 under N2. This is framed by a reduction of the barrier for carrier extraction. The achieved improvements are linked to a nitrogen‐assisted recovery of intrinsic lattice disorder at the grain shells along with a simultaneous stabilization of …
Publication date: 
1 Mar 2019

Alessandra Alberti, Ioannis Deretzis, Giovanni Mannino, Emanuele Smecca, Filippo Giannazzo, Andrea Listorti, Silvia Colella, Sofia Masi, Antonino La Magna

Biblio References: 
Volume: 9 Issue: 12 Pages: 1803450
Advanced Energy Materials