Elucidation of the role of guanidinium incorporation in single-crystalline MAPbI 3 perovskite on ion migration and activation energy.

Autor: Mahapatra A; Department of Physics & Astronomy, National Institute of Technology, Rourkela, 769008, India., Runjhun R; Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland. dprochowicz@ichf.edu.pl., Nawrocki J; Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland. dprochowicz@ichf.edu.pl., Lewiński J; Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland. dprochowicz@ichf.edu.pl and Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland., Kalam A; Department of Chemistry, Faculty of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia., Kumar P; Department of Physics & Astronomy, National Institute of Technology, Rourkela, 769008, India., Trivedi S; Department of Chemical Engineering, National Institute of Technology, Rourkela, 769008, India., Tavakoli MM; Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA., Prochowicz D; Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland. dprochowicz@ichf.edu.pl., Yadav P; Department of Solar Energy, School of Technology, Pandit Deendayal Petroleum University, Gandhinagar-382 007, Gujarat, India. Pankajphd11@gmail.com.
Jazyk: angličtina
Zdroj: Physical chemistry chemical physics : PCCP [Phys Chem Chem Phys] 2020 May 28; Vol. 22 (20), pp. 11467-11473. Date of Electronic Publication: 2020 May 11.
DOI: 10.1039/d0cp01119c
Abstrakt: Ion migration plays a significant role in the overall stability and power conversion efficiency of perovskite solar cells (PSCs). This process was found to be influenced by the compositional engineering of the A-site cation in the perovskite crystal structure. However, the effect of partial A-site cation substitution in a methylammonium lead iodide (MAPbI 3 ) perovskite on the ion migration process and its activation energy is not fully understood. Here we study the effect of a guanidinium (GUA) cation on the ion transport dynamics in the single crystalline GUA x MA 1-x PbI 3 perovskite composition using temperature-dependent electrochemical impedance spectroscopy (EIS). We find that the small substitution of MA with GUA decreases the activation energy for iodide ion migration in comparison to pristine MAPbI 3 . The presence of a large GUA cation in the 3D perovskite structure induces lattice enlargement, which perturbs the atomic interactions within the perovskite lattice. Consequently, the GUA x MA 1-x PbI 3 crystal exhibits a higher degree of hysteresis during current-voltage (J-V) measurements than the single-crystalline MAPbI 3 counterpart. Our results provide the fundamental understanding of hysteresis, which is commonly observed in GUA-based PSCs and a general protocol for in-depth electrical characterization of perovskite single crystals.
Databáze: MEDLINE