Polymer solar cells can utilize low-cost manufacturing techniques such as solution spin coating, roll-to-roll, and inkjet printing, and are expected to greatly reduce the manufacturing cost of solar cells. Although the conversion efficiency of polymer solar cells has exceeded 10% in recent years, most of the polymers are based on benzodithiophene building blocks. In order to achieve further breakthroughs in the efficiency of organic solar cells, there is an urgent need for solar cell materials based on new design strategies and new construction units. Under the support of the National Outstanding Youth Fund, the 100-member Plan of the Chinese Academy of Sciences and the Innovation International Team of the Chinese Academy of Sciences, the Zheng Qingdong Research Group of the State Key Laboratory of Structural Chemistry of the Fujian Institute for the Study of Structures of the Chinese Academy of Sciences for the first time used asymmetric pyrenethiophene as a building block for a series of novel polymerizations. Solar cell material design and synthesis. Based on the synthesized polymer materials, the team successfully prepared a solar cell with high conversion efficiency of 9.14%. In addition, under the condition of no additives, a high open-circuit voltage solar cell of nearly 1V was realized. The related results were recently published online as VIP articles in Advanced Materials (DOI:10.1002/adma.201505957). This work broadens the range of choice for electron-building units in the field of polymer solar cells: from symmetric benzodithiophene extension to asymmetric indenothiophene building blocks. Compared to benzodithiophene-containing polymer materials, indenothiophene-based polymer materials will have wider bandgap and deeper occupied molecular orbital (HOMO) levels, and are therefore more suitable as short-wavelength absorbing solar cells. The material is used for the preparation of high open-circuit voltage high-efficiency tandem solar cells. Previously, the team constructed a ZnMgO electron transport layer material by sol-gel method and used this novel ternary wide bandgap semiconductor interface material to successfully realize organic solar cells with high efficiency and long-term stability (Advanced Energy Materials, 2016 , 6, 1501493). This study provides important ideas for the design and practical application of low-cost, high-efficiency, long-life organic solar cells. In addition, the team was also invited to write a review on the interface material research of organic solar cells in Advanced Science (2016, DOI: 10.1002/advs.201500362). In this review paper, Zheng Qingdong's research team combined with the research work of the team to comprehensively introduce various interface layer materials for conventional and inverted single cells and laminated organic solar cells, and systematically described the latest developments in this field. This work will help researchers understand the challenges and opportunities facing this emerging field and deepen the understanding of the organic photovoltaic interface science at home and abroad.
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