Basic research on various new energy conversion mechanisms is the key to efficient conversion and utilization of clean energy. Our group is committed to developing commercial high-performance crystalline silicon solar cells, new thermoelectric materials, and OER/HER/nitrogen fixation catalyst materials. We have set up a photovoltaic industrialization research center, focusing on the study of new crystalline silicon cells and the development of unique, industry-leading key materials for silicon solar cells. The basic principle of grain interfacial characteristics and size optimization in thermoelectric materials has been investagated to develop high-performance thermoelectric materials at room temperature. Combining advanced structural characterization, data analysis and theoretical calculation, high-efficiency, stable, low-cost and environment-friendly photocatalysis and electro-catalysis materials have been developed. Research on a variety of key materials and devices will provide technical support for the development of clean energy and new materials industries.