At the beginning of 2014, Prof. Zhan Xiaowei from Peking University’s School of Engineering obtained a series of important research advances in the direction of organic polymer solar cell materials and devices, and published 5 papers in famous journals in the fields of materials and energy (influence factor greater than 10). One was selected as the cover, and one was featured 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 cells are the international frontier crossover research fields and have broad application prospects.
The organic solar cell active layer structure mainly includes two kinds of bulk heterojunction and planar heterojunction. Compared with bulk heterojunction cells, planar heterojunction cells have low efficiency, and often require vacuum evaporation of the active layer. Solution preparation of high-efficiency planar heterojunction devices is rarely reported.
Zhan Xiaowei's research group designed and synthesized organic small-molecule photovoltaic materials with selective solubility, and processed the solar cells with excellent performance using a solution method. The filling factor was as high as 0.75, which is the highest value of organic small molecule solar cells. The work was published in Adv. Energy Mater. (2014, 4, 1300 626) and was featured in the Wiley website Materials Views China.
They also processed thin-bandgap polymer donors/fullerene PC61BM receptor solar cells using a solution method layer with an efficiency of up to 7.13%, which is the highest value for double-layer heterojunction polymer cells (Adv. Energy Mater., 2014, DOI: 10.1002/aenm.201301349). They added fullerene ICBA to narrowbandgap polymer donor/fullerene PC71BM acceptor solar cells to regulate the energy level structure and morphology, thereby increasing cell efficiency to 8.24%, which is a three-component bulk heterojunction. The highest value of polymer solar cells (Energy Environ. Sci., 2014, DOI: 10.1039/C3EE44202K).
Organic photovoltaic materials can be divided into electron donors and electron acceptors. Fullerene derivatives have become the most widely used and most successful electron acceptor. Due to the shortcomings such as weak absorption in the visible region of fullerene receptors, non-fullerene acceptors have attracted more and more attention.
However, the efficiency of non-fullerene batteries is much lower than that of fullerene batteries. The development of high performance non-fullerene receptors is a challenging problem in the field of organic solar cells. Zhan Xiaowei's research group used the phthalimide polymer receptors they created to blend with narrow-gap polymer donors to produce high-performance all-polymer solar cells with an efficiency of 3.45%, which is the highest efficiency of all-polymer batteries. one.
Their paper (Energy Environ. Sci., 2014, 7, 1351-1356) was selected as the cover. They also designed and synthesized three-dimensional conjugated phthalimide macromolecule receptors, based on which the non-fullerene receptor has a cell efficiency of 3.32%, which is one of the highest efficiencies of non-fullerene cells (Adv. Mater., 2014, DOI: 10.1002/adma.201400525).
The first authors of these five papers were respectively Lin Xiaoze and Cheng Pei, Ph.D. students of Zhan Xiaowei's group. This study was supported by the 973 project of the Ministry of Science and Technology, the National Fund for Distinguished Young Scientists, the International Cooperation Project of the National Natural Science Foundation of China, and the Chinese Academy of Sciences.
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