Ningbo Materials Institute has made important progress in organic solar cell research

Facing the huge demand for energy and the increasingly serious environmental pollution, solar energy is an inexhaustible and inexhaustible energy treasure house that nature endows human beings, and new solar cell technology has been widely valued Organic solar cells (OSC) have many advantages, such as light weight, ultra-thin, flexible, easy to prepare in large area, etc., which have broad application prospects in portable, flexible batteries, photovoltaic building energy supply and other fields Ge Ziyi research group of Ningbo Institute of materials technology and engineering, Chinese Academy of Sciences has made new progress in the field of organic solar cells Btp-4f-12 was synthesized by increasing the length of alkyl side chain of benzothiadiazole seven membered fused ring y6 non fullerene receptor, regulating its molecular arrangement and solubility By using non halogen solvent THF instead of chlorobenzene, the efficiency of single node binary OSC was 16.4% This work was published in advanced materials (DOI: 10.1002 / ADMA 201903441) under the title of "eco compatible solution processed organic photovoltaic cells with over 16% efficiency" In addition, by introducing the third component PC 71 BM into the binary system of wide band gap polymer donor pm6 and narrow band gap receptor y6, the research group further broadened the absorption range of the photo active layer and optimized the morphology of the film, and obtained the original device with single junction rigidity of 16.67% and flexibility of 14.06%, which is the most efficient flexible device reported in the public OSCs After 1000 times of continuous bending (bending radius r = 5.0 mm), the battery can still maintain 90% of the initial efficiency, showing very good bending resistance, which provides an important guidance for the preparation of efficient OSC flexible devices This work was published in advanced materials (DOI: 10.1002 / ADMA 201902210) under the title of "16.67% rigid and 14.06% flexible organic solar cells enabled by Terry heterojunction strategy" The above research has obtained the national key R & D plan（ 2016yfb00401000), National Natural Science Foundation of China (51773212, 21574144, 61705240 and 21674123), Zhejiang Outstanding Youth Fund (lr16b040002), Ningbo Science and technology innovation team (2015b11002, 2016b10005), key research project of Frontier Science of Chinese Academy of Sciences (qyzdb-ssw-sys030) and key international cooperation project of Chinese Academy of Sciences (174433kysb20160065), etc.