At the beginning of 2014, Prof. Xiaowei Zhan ’s group at the School of Engineering, Peking University achieved a series of important research progress in the field of organic polymer solar cell materials and devices, and published 5 papers in well-known journals in the field of materials and energy (impact factors greater than 10) , One was selected as the outer cover, and one was reported as a highlight on the Wiley website. Solar energy is the safest, greenest and most ideal renewable clean energy for human beings. Organic polymer solar cells use organic polymer materials to make devices to achieve photoelectric conversion, and can be made into flexible large-area devices by solution processing technology, which has the advantages of light weight, low cost, and portability. Organic polymer solar cell is an international frontier cross-research field with broad application prospects. There are two main types of organic solar cell active layer structures: bulk heterojunction and planar heterojunction. Compared with bulk heterojunction batteries, planar heterojunction batteries have lower efficiency, and often require vacuum evaporation of the active layer. The preparation of high-efficiency planar heterojunction devices by the solution method is rarely reported. The research team of Zhan Xiaowei designed and synthesized organic small-molecule photovoltaic materials with selective solubility, and obtained a solar cell with excellent performance by layer-by-layer processing using a solution method. Its fill factor is as high as 0.75, which is the highest value of organic small-molecule solar cells. The work was published in Adv. Energy Mater. And was reported as a highlight on the Wiley website Materials Views China. They also used the solution method to process the narrow band gap polymer donor / fullerene PC61BM acceptor solar cell layer by layer, with an efficiency as high as 7.13%, which is the highest value of the double-layer heterojunction polymer battery. They added fullerene ICBA to the narrow band gap polymer donor / fullerene PC71BM acceptor solar cell to regulate the energy level structure and morphology, thereby improving the cell efficiency to 8.24%, which is a three-component bulk heterojunction The highest value of polymer solar cells. Organic photovoltaic materials can be divided into electron donors and electron acceptors. Fullerene derivatives have become the most widely used and successful electron acceptors. Due to the shortcomings of fullerene receptors such as weak absorption in the visible region, non-fullerene receptors have received increasing attention. However, the efficiency of non-fullerene batteries is much lower than that of fullerene batteries, and developing high-performance non-fullerene receptors is a challenging problem in the field of organic solar cells. The research team of Zhan Xiaowei used the peryleneimide polymer acceptor created by them and the narrow band gap polymer donor to prepare a high-performance all-polymer solar cell with an efficiency of up to 3.45%, which is the highest efficiency of all polymer cells One. Their paper was chosen as the outer cover. They also designed and synthesized a three-dimensional conjugated peryleneimide macromolecular receptor. Based on this non-fullerene receptor, the battery efficiency reached 3.32%, which is one of the highest efficiency of non-fullerene batteries. The first authors of these five papers were Lin Yuze and Cheng Pei, PhD students in the group of Xiao Wei. This research was supported by the 973 project of the Ministry of Science and Technology, the National Outstanding Youth Science Foundation, the International Cooperation Project of the National Natural Science Foundation of China and the Chinese Academy of Sciences. Convenient folding for long battery life. fold Jiangsu Anywhere Mobility LTD. , https://www.annelectricscooter.com
Peking University has made a series of important progress in the direction of organic solar cells