Machine-Learning-Assisted Accurate Band Gap Predictions of Functionalized MXene

Rajan, Arunkumar Chitteth and Mishra, Avanish and Satsangi, Swanti and Vaish, Rishabh and Mizuseki, Hiroshi and Lee, Kwang-Ryeol and Singh, Abhishek K (2018) Machine-Learning-Assisted Accurate Band Gap Predictions of Functionalized MXene. In: CHEMISTRY OF MATERIALS, 30 (12). pp. 4031-4038.

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Abstract

MXenes are two-dimensional (2D) transition metal carbides and nitrides, and are invariably metallic in pristine form. While spontaneous passivation of their reactive bare surfaces lends unprecedented functionalities, consequently a many-folds increase in number of possible functionalized MXene makes their characterization difficult. Here, we study the electronic properties of this vast class of materials by accurately estimating the band gaps using statistical learning. Using easily available properties of the MXene, namely, boiling and melting points, atomic radii, phases, bond lengths, etc., as input features, models were developed using kernel ridge (KRR), support vector (SVR), Gaussian process (GPR), and bootstrap aggregating regression algorithms. Among these, the GPR model predicts the band gap with lowest root-mean-squared error (rmse) of 0.14 eV, within seconds. Most importantly, these models do not involve the Perdew-Burke-Ernzerhof (PBE) band gap as a feature. Our results demonstrate that machine-learning models can bypass the band gap underestimation problem of local and semilocal functionals used in density functional theory (DFT) calculations, without subsequent correction using the time-consuming GW approach.

Item Type:	Journal Article
Publication:	CHEMISTRY OF MATERIALS
Publisher:	AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Additional Information:	Copyright of this article belong to AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	19 Jul 2018 14:54
Last Modified:	19 Jul 2018 14:54
URI:	http://eprints.iisc.ac.in/id/eprint/60243

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