Abstract
The pressing need for novel materials that can serve rising demands in solar cell and optoelectronic technologies makes the nexus of halide perovskites, high-throughput computations, and machine learning, very promising. Ever increasing amounts of data on the structure, fundamental properties, and device performance of halide perovskites provide opportunities for learning chemical rules and design principles that make these materials attractive, and applying them across wide chemical spaces. In this work, we show that impurity properties of halide perovskites computed using density functional theory (DFT) can be combined with machine learning (ML) to deliver predictive models and quick identification of optoelectronically active impurity atoms. Our computation lead to the largest reported dataset of the formation energies and charge transition levels of Pb-site impurities in methylammonium lead halide (\(\hbox {MAPbX}_3\)) perovskites. Descriptors are defined to uniquely represent any impurity atom in any \(\hbox {MAPbX}_3\) compound and mapped to the computed impurity properties using regression techniques such as Gaussian process regression, neural networks, and random forests. We use the best optimized predictive models to make predictions for hundreds of impurities across 9 \(\hbox {MAPbX}_3\) compounds and create lists of dominating impurities, that is, impurities that can shift the equilibrium Fermi level in the perovskite as determined by native point defects. This accelerated screening powered by computations and machine learning can guide the identification of problematic impurities that may cause undesired recombination of charge carriers, as well as impurities that can be deliberately introduced to tune the perovskite conductivity and resulting photovoltaic absorption.
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Data and Code Availability
The entire DFT dataset, including supercell and unit cell defect calculations and all reference calculations, can be accessed from Materials Data Facility [88]. Tabulated DFT properties (impurity formation energies and charge transition levels), descriptors for ML, scripts to train and optimize neural network, random forest, Gaussian process, and linear models, and all ML predictions can be accessed here: https://github.com/mannodiarun/perovs_defects_ML.git.
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Acknowledgements
Extensive discussions with and scientific feedback from Dr. Alex Martinson (Argonne), Dr. David Fenning (UCSD), Rishi Kumar (UCSD), and Dr. Ji-Sang Park (Kyungpook National University) are acknowledged. This work was performed, partly at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, and supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357, and partly at Purdue University, under startup account number F.10023800.05.002. This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. We gratefully acknowledge the computing resources provided on Bebop, a high-performance computing cluster operated by the Laboratory Computing Resource Center at Argonne National Laboratory.
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Mannodi-Kanakkithodi, A., Chan, M.K.Y. Accelerated screening of functional atomic impurities in halide perovskites using high-throughput computations and machine learning. J Mater Sci 57, 10736–10754 (2022). https://doi.org/10.1007/s10853-022-06998-z
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DOI: https://doi.org/10.1007/s10853-022-06998-z