\”Science\” 17.3%! Nankai University, Chen Yongsheng team to refresh the world record

Nankai News Network (reporter Wu Junhui) reporter was informed that Nankai University College of Chemistry Professor Chen Yongsheng led the team obtained in the field of organic solar cell research in breakthrough. They designed and produced with high efficiency, broad spectral absorption characteristics of the organic solar cell laminate materials and devices to achieve a photoelectric conversion efficiency of 17.3%, set a world record the highest photoelectric conversion efficiency of the solar cell organic / polymeric now reported in the literature . The latest results make organic solar cells from industrialization step closer. US Eastern Time on August 9 in the afternoon, the paper describes the study was published online in top international academic journals \” Science \” on. wherein the flexible organic solar cell and the main results of this work, an organic solar cell is an effective way to solve the environmental pollution, energy crisis, which is light, flexible, translucent, low-cost printing a large area, environment friendliness are far superior to conventional solar cells, is considered the next generation of green energy technology has great prospects for the industry. However, to achieve high efficiency conversion of solar energy is the key problem for organic solar cells. And this problem can be resolved directly determines whether organic solar cells out of the laboratory and into the actual production of human life. In recent years, although the organic solar cell research has been rapid development, to achieve the photoelectric conversion efficiency of 14% to 15%, but still far behind the rest of the solar cell conversion efficiency of mainly inorganic material (such as silicon) -based . \”The main reason that the organic polymer material itself lower carrier mobility of the active layer thickness limits, so sunlight can not be obtained sufficiently, and effective use.\” Chen Yongsheng said. According to reports, tandem solar cell can not overcome the above problems, can give full play to the organic polymer material and structural properties and excellent tunability characteristic light absorption in the active material of the battery before and after complementary to laminate batteries, more efficient use of sunlight in order to achieve higher energy conversion efficiency. Professor Chen Yongsheng team and Chinese Academy of Sciences National Center for Nanoscience Professor Ding Liming , South China University of Technology leaves VillaProfessor Li The research team to cooperate, firstly using semi-empirical model, predicted theoretically from the organic solar cell can actually achieve maximum efficiency and required parameters over the active layer material. Based on this, they have good complementary absorption in the visible region and the near-infrared region PBDB-T: FM and PTB7-Th: O6T-4F: PC71BM were used as the front cell and a rear cell active layer material, low use cost, industrial production and processing methods compatible solution, prepared a highly efficient organic solar cushion device to obtain 17.3% of the efficiency of verification . The team researchers, according to the working model and the design principle proposed diversity combined organic polymer material and an adjustable structure, by further optimization of materials and devices, and an inorganic material is expected to be similar energy conversion efficiency , thereby providing strong support for the industrial art of organic solar cells. \”We propose semi-empirical model based on predictions, organic solar cells (cushion) the highest conversion efficiency can theoretically reach 20% or more. This work, we also carried out on the battery life of preliminary tests, experiments found that 166 days after only a 4% reduction in cell efficiency. the future, we will continue to design new materials, while further improving the energy conversion efficiency, systematic experiments on battery life issues, fight for an organic solar cell from the lab to practical application as soon as possible. \” Chen Yongsheng said. It is understood that the research project was supported by the Ministry of Science, the National Natural Science Foundation of China, Nankai University of Tianjin Science and Technology Commission. Papers link: https: //doi.org/10.1126/science.aat2612