Communication—Large Electron-Hole Diffusion Lengths in Methylammonium Lead Triiodide Perovskite Films Prepared by an Electrochemical-Chemical Approach

MACOR, LORENA; SIGAL, AGUSTÍN; DITTRICH, THOMAS; RAPPICH, JÖRG; OTERO, LUIS; GERVALDO, MIGUEL

ECS Journal of Solid State Science and Technology

THE ELECTROCHEMICAL SOCIETY.

Lugar: Pennington, New Jersey; Año: 2017 vol. 6 p. 819 - 821

2162-8769

Methylammonium lead triiodide (CH3NH3PbI3) perovskite films were generated by chemical conversion of PbO2 layers electrodepositedover NiO hole selective contact, by simple immersion in CH3NH3I isopropanol solution under ambient conditions. 2.4μm charge carrier diffusion lengths were measured by surface photovoltage, being these very similar to the size of the as formed perovskite crystals, showing that there are not deleterious encounters with defects or impurities. The electrochemical procedure used here demonstrates the capacity of this technique for the fabrication of perovskite films with large electron-hole diffusion lengths by solution based processes using only water and isopropanol.