The Studies on Gallium Nitride-Based Materials: A Bibliometric Analysis

Abstract

Gallium nitride (GaN) has a wide energy band gap and a high power density, efficiency, switching frequency, and electron carrier mobility, having broad applications in digitization. Because GaN has high potentials, this study performed a bibliometric analysis on the publications of GaN indexed in the Web of Science database from 1970 to 2023. A performance analysis of the 15,634 publications was performed using Harzing’s Publish or Perish tool, while science mappings were performed with VOSviewer software. The results show that there has been an uptrend in the on-going research on GaN, especially in the past decade. Most of the documents are within the fields of physics, engineering, and materials science. The United States has the highest number of publications and the most impactful research. The United States is also actively collaborating with other countries to gain deeper insights into GaN. The analysis shows that the concentration of GaN research is slowly moving towards the development of high-voltage operations.

Bibliometric Analysis of Granger Causality Studies

“…The sixth most cited paper by Smith et al [ 77 ] studied the comparison among connectivity estimation approaches by using simulated FMRI data. The seventh most cited paper by Baccala and Sameshima [ 95 ] presented a new frequency-domain approach based on the concept of Granger causality to describe the relationships between multivariate time series based on the decomposition of multivariate partial coherences determined from multivariate autoregressive models. The next most cited paper by Nolte et al [ 96 ] presented an approach that is insensitive to false connectivity arising from volume conduction for interpreting EEG data in terms of brain connectivity.…”

“…The value of g -index is explained as the g number of publications with at least g 2 citations. Thus, the h -index measures the influence while g -index measures the impact [ 94 , 95 , 96 , 97 ].…”

The Studies on Chitosan for Sustainable Development: A Bibliometric Analysis

“…The Scopus database also has the most extensive coverage and widest citation records among all the scientific databases [ 53 , 54 ]. Figure 1 explains the process of the bibliometric analysis of chitosan for sustainable development [ 55 , 56 ].…”