Structure of international research collaboration in wind and solar energy

Climate change is a common global issue. Advanced technologies to tackle the problem are spread throughout the world. Among varies kind of energy sources, wind power and solar cell are the most promising technologies for green growth. This paper will first aim to identify the structure of international research collaboration in wind power and solar cell. Secondly, this paper will compare both structures and discuss factors that would create and support international relationships. We use bibliometric approach. The research collaboration networks in wind power and solar cell include 4,189 and 6,660 institutions, respectively. We find that physical distance, international S&D policy, historical and institutional factors, and maturity of technologies have a large impact on the research collaboration.