Aspects of effectiveness and significance: The use of machine learning methods to study CuIn<inf>1-x</inf>Ga<inf>x</inf>Se<inf>2</inf> solar cells

The goal of this work is to enhance the efficiency of CuIn1-xGaxSe2 (CIGS) thin film solar cells by investigating the critical factors affecting their device performance and the correlations between them. To achieve this goal, machine learning algorithms are employed to uncover the primary parameters and correlations affecting CIGS solar cell device performance. The experimental data is used to develop the data sets for machine learning analysis. The correlation studies allow for the investigation of the key factors governing device performance. The algorithms used in the study include linear regression (LR), random forest (RF), extreme gradient boosting (XG), decision tree (DT), support vector machine regressor (SVM), stochastic gradient descent regressor (SGD) and Bayesian ridge (Bayesian). The results showed that decision trees provide the most accurate predictions of CIGS solar cell efficiency, with a root mean square error of 0.11 and 1.83 and a Pearson coefficient of 0.9 and 0.88 for the training and test data sets, respectively. Additionally, this research provides important insight into the necessary components and ideal device dimensions, offering helpful guidelines for subsequent experimenting optimization endeavours.