International technology transfer of clean technologies is becoming an important issue due to the rising international concern over climate change. By transferring clean technologies from developed countries to developing countries, developing nations need not go through the process of adopting dirty technologies, but can leapfrog over them to install clean technologies, which are already available in other countries and reduce the amount of greenhouse gases. Past field studies reveal that wind turbine technology proceeded with a successful technology transfer to China and India, where it is manufactured and also installed actively within the country. However, as for photovoltaic technology, those two countries quickly became the most active producers of solar panels, but most of the products are exported in foreign countries rather than installed domestically. This research aims to examine the differences of technical characteristics of two technical fields based on patent data, namely patent classification and characteristics of applicants. In order to enhance not only the manufacturing capacity but also the possibility of domestic adoption of clean products, the findings of this research will help the developing nations to absorb particular technologies with harvesting local capability of technology and market.