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Enhancement of morphological and optoelectronic properties of perovskite films by CH3NH3Cl treatment for efficient solar mini-modules Jose Ignacio Uribe, John Ciro, Juan Felipe Montoya, Jaime Osorio, and Franklin Jaramillo ACS Appl. Energy Mater., Just Accepted Manuscript • DOI: 10.1021/acsaem.7b00194 • Publication Date (Web): 06 Feb 2018 Downloaded from http://pubs.acs.org on February 6, 2018
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ACS Applied Energy Materials
Enhancement of Morphological and Optoelectronic Properties of Perovskite Films by CH3NH3Cl Treatment for Efficient Solar Mini-Modules
Jose I. Uribe1,2,*, John Ciro1, Juan Felipe Montoya1, Jaime Osorio2, Franklin Jaramillo1* 1. Centro de Investigación, Innovación y Desarrollo de Materiales – CIDEMAT, Facultad de Ingeniería, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia. 2. Grupo de Estado Sólido, Instituto de Física, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia. * Corresponding authors:
[email protected];
[email protected] Abstract In order to get homogeneous and high-quality perovskite CH3NH3PbI3 films, different growing methods have been developed, but most of them are unsuitable to scaling up. In this work, we studied in a systematic approach the influence of CH3NH3Cl (MACl) surface treatment in the acetonitrile (ACN) deposition route. This method does not require vacuum neither solvents quenching steps, which make it probable one of the easiest for transference from lab scale to large area deposition techniques such as roll-to-roll printing. The properties of perovskite films grown by ACN method and the influence of the MACl on the performance of the perovskite solar cells (PSCs) are characterized in detail by different 1 ACS Paragon Plus Environment
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techniques. By Atomic Force Microscopy (AFM) and Kelvin Probe Force Microscopy (KPFM) we found significant differences in the morphology and the work function of the perovskite with and without MACl treatment. Moreover, the microstructure presents very different behavior: after being exposed to radiation the MACl treated sample presented passivated grain boundaries and higher intensity in the photoluminescence (PL) emission. The higher PL for perovskites films with MACl treatment correlates with superior photovoltaic parameters of PSCs. All these features lead to highly homogeneous perovskite layers on large areas enabling the fabrication of 10 x 10 cm solar mini-modules processed in air at low temperature (
