Mahshid Ahmadi1,Jonghee Yang1,Diana LaFollette2,Benjamin Lawrie3,Anton Ievlev3,Juan Pablo Correa Baena2
University of Tennessee, Knoxville1,Georgia Institute of Technology2,Oak Ridge National Laboratory3
Mahshid Ahmadi1,Jonghee Yang1,Diana LaFollette2,Benjamin Lawrie3,Anton Ievlev3,Juan Pablo Correa Baena2
University of Tennessee, Knoxville1,Georgia Institute of Technology2,Oak Ridge National Laboratory3
Metal halide perovskites (MHPs) are currently leading materials towards high-performance optoelectronics. Despite today’s scientific renaissance of the MHPs, a key constraint hesitating one-step towards their realization is stability. There are several challenges which must be overcome to improve the stability of MHP devices. One of these challenges is the understanding and control of their defect chemistry. Conventional spectroscopy faces serious obstacles to investigate defects in MHPs. In this talk, I will discuss a combination of spatially-resolved chemical and spectroscopic analysis, including time-of-flight secondary-ion mass spectroscopy (ToF-SIMS), cathodoluminescence (CL) spectroscopy and conductive atomic force microscopy (c-AFM) to systematically explore the fate of defects in MHP systems [1-3]. Our observations provide key features that must be considered towards development of MHP optoelectronics, which guarantees excellent performances and longevities.<br/><br/>D. Kim, Y. Liu, A. V. Ievlev, K. Higgins, O. S. Ovchinnikova, J. S. Yun, J. Seidel, S. V. Kalinin, M. Ahmadi, Unraveling the Hysteretic Behavior at Double Cations-Double Halides Perovskite - Electrode Interfaces, <i><u>Nano Energy </u></i><u>(2021) 89, 106428.</u><br/>D. Kim, K. Higgins, M. Ahmadi, Navigating Grain Boundaries in Perovskite Solar Cells, <i><u>Matter </u></i><u>(2021) 4, 5, 1442.</u><br/>J. Yang, D. LaFollette, B. Lawrie, A. Ievlev, S. Kalinin, J.-P. Correa-Baena, M. Ahmadi, Spatially Resolved Defect Formations in Metal Halide Perovskites, under review (2022)