Data-Driven Investigation of the Synthesizability and Bandgap of Double Perovskite Halides
- Authors
- Kim, Joonchul; Min, Kyoungmin
- Issue Date
- Aug-2022
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- bandgaps; double perovskite halide; first-principles calculations; machine learning; thermodynamical properties
- Citation
- ADVANCED THEORY AND SIMULATIONS, v.5, no.8
- Journal Title
- ADVANCED THEORY AND SIMULATIONS
- Volume
- 5
- Number
- 8
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/42748
- DOI
- 10.1002/adts.202200068
- ISSN
- 2513-0390
- Abstract
- Double perovskite halide materials have been widely used in batteries, light-emitting diodes, and solar cells. Thus, investigations of the fundamental properties of the double perovskite halide to search for an ideal structure are crucial. In this study, a surrogate model is developed to predict the formation energy, convex hull energy, and bandgap of A(2)BB'X-6 type double perovskite halide structures. The material properties of 13 542 candidate structures are predicted and validated through first-principles calculations. Without double perovskite halide information during training, the prediction accuracy for the formation energy is obtained as an R-squared value of 0.770 and Root Mean Square Error (RMSE) of 0.404 eV atom(-1). For the convex hull energy, an accuracy of 0.642 is obtained. For the bandgap, R-squared score of 0.427 and an RMSE of 1.235 eV are achieved. Furthermore, the optimization process confirms that adding only 850 (6%) double perovskite halide structures to the training set increases the R-squared value to 0.90 for the formation energy. In the bandgap, more data are needed; 3550 data (68.2%) are added to achieve an R-squared score of 0.9. The current study successfully predicts the fundamental properties of double perovskite halides for the accelerated discovery of ideal structures.
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