At 13:00 on May 18, 2023, Prof. Donghong Yu from Aalborg University of Denmark was invited by Prof. Hui Huang to deliver the keynote lecture "Conjugate break: A New Design Strategy for electron acceptor-Polymers in all-polymer Solar Cells" in the University of Chinese Academy of Sciences. The lecture was held in Room 106 on the second floor of the classroom.

Since the beginning of life on Earth. They live mainly on thermal radiation from the sun. Solar energy is an inexhaustible treasure house of energy endowed by nature. Organic solar cells (OSCs) have many advantages, such as low cost, light weight, ultra-thin, flexibility, and easy preparation of large areas. They are broad application prospects in portable, flexible cells, photovoltaic building energy supply and other fields.

Starting with the history of organic solar cells (he started with fullerenes, went to ITIC, and finally to the current star molecule Y6), Prof. Donghong Yu lays out the challenges of solar cells. The main difficulty of the industrialization of organic solar cells lies in their poor stability, which leads to the energy generated is not enough to offset the energy consumed in the preparation of organic solar cells.The main chain of the fully conjugated organic polymer solar cell is linked to aromatic hydrocarbons (heteroaromatic hydrocarbons), which makes the degradation and recovery of organic solar cells difficult. To solve this problem, Prof. Donghong Yu proposed to introduce alkyl sulfur into the main chain of organic solar cells. The introduction of heteroatoms provides a potential possibility for the degradation of solar cells. Based on this, Yu Donghong's team prepared a series of non-fully conjugated organic polymer solar cells with sulfur atoms in the main chain. Then, Prof. Donghong Yu introduced some techniques of writing the article, hoping to be helpful to teachers and students on site. Finally, Prof. Donghong Yu communicated and discussed with the teachers and students on site, which was warmly responded by the teachers and students on site.

Dr. Donghong Yu obtained his B.Sc(1991)/M.Sc.(1994) in polymer chemistry and physics in Jilin University, China. In 1997 he was awarded the PhD degree in polymer chemistry and physics Changchun Institute of Applied Chemistry, Chinese Academy of Science, China. Then he started working as postdoc in National Institute of Materials and Chemical Research, Japan & Department of Materials and Production, Aalborg University, Denmark, in 1998 and 2000, respectively. Later in 2001 and 2006, he was appointed as a faculty member as tenure-track assistant professor and tenured associate professor in Department of Chemistry and Bioscience at Aalborg University, respectively.