MRS Meetings and Events


EL04.05.03 2023 MRS Spring Meeting

Studying Defect Density Distributions in Mixed Perovskites

When and Where

Apr 13, 2023
9:15am - 9:30am

Moscone West, Level 3, Room 3004



Mriganka Singh1,Michel Keersmaecker1,Erin Ratcliff1

University of Arizona1


Mriganka Singh1,Michel Keersmaecker1,Erin Ratcliff1

University of Arizona1
The immoderate distribution of defects at grain boundaries (GBs), interfaces, and surfaces are dominant factors for highly efficient and stable perovskite solar cells. Here, we introduced an effective way to suppress interfacial defect densities using ionic liquids (ILs; 1-methyl-3-octylimidazolium tetrafluoroborate: C<sub>12</sub>H<sub>23</sub>BF<sub>4</sub>N<sub>2</sub>) as the surface passivation which accelerates the perovskite crystallization via two-step spin coating formed metal halide mixed perovskites without solvent engineering. Using a solid-state electrochemical approach [Ref 1], we measure defect densities for SnO<sub>2</sub>/perovskite stacks with or without doping of ILs. To study defect density distributions of passivated and unpassivated SnO<sub>2</sub>/perovskite films, the carrier recombination velocities of individual GBs are measured at the microscope scale by mapping the photoluminescence pattern in which changes in nonradiative recombination of carriers at GBs are captured.<br/> <br/>Keywords: <i>Operando characterization</i><i>, Electrochemistry, Mixed perovskite, Surface passivation, solar cells.</i><br/> <br/>References<br/>1. Michel De Keersmaecker, Neal R. Armstrong, and Erin L. Ratcliff. "Defect quantification in metal halide perovskites: the solid-state electrochemical alternative." <i>Energy & Environmental Science</i> 14, no. 9 (2021): 4840-4846.



Symposium Organizers

Felix Deschler, University of Heidelberg
Linn Leppert, University of Twente
Sebastian Reyes-Lillo, Universidad Andres Bello
Carolin Sutter-Fella, Lawrence Berkeley National Laboratory

Publishing Alliance

MRS publishes with Springer Nature