Qingdao Energy Institute proposed to improve the flexibility and stability of organic solar cell devices
Organic solar cell (OPV) technology is unique by virtue of its light weight, flexibility, translucency, low light sensitivity, and large area preparation by roll-to-roll, which can effectively complement inorganic solar cells in portable and flexible electronic consumer applications. Has attracted the attention of domestic and foreign scientific research institutions and industry. In recent years, the efficiency of OPV has made great progress, exceeding 18%. However, the research on the stability of OPV devices lags behind the development of efficiency. At present, the poor light and thermal stability of OPV is the resistance to its industrialization.
The advanced functional materials and device research group led by Bao Xichang, a researcher at the Qingdao Institute of Bioenergy and Processes, Chinese Academy of Sciences, a high-temperature resistant and high-performance engineering plastics innovation team led by professor Wang Jinyan of Dalian University of Technology, and Yang Chunming, a researcher of Shanghai synchrotron radiation light source A general strategy based on high temperature resistant polyarylene ether resin to improve the stability and flexibility of organic solar cells. The related research results are titled A Universal Method to Enhance Flexibility and Stability of Organic Solar Cells by Constructing Insulating Matrices in Active Layers, published in Advanced Functional Materials ("Advanced Functional Materials").
High temperature resistant polyarylether resin is a special engineering plastic with high temperature resistance and water and oxygen stability, which can meet the needs of use in extreme environments. In contrast, organic photovoltaic materials are difficult to avoid the high-temperature creep behavior of their own molecules because of the presence of long flexible side chains (improving solubility), which is one of the reasons for the poor stability of OPV devices. At the same time, the highly twisted main chain structure of polyarylene ether imparts mechanical properties and stretchability to the polymer film. Photovoltaic donor-acceptor compounds are weaker in film mechanical properties than high temperature resistant polyarylether resins. In the study, by constructing a network structure of high temperature resistant polyarylether resin in the active layer of OPV, the factors and mechanism of high temperature resistant polyarylether resin in the active layer on device efficiency, stability and flexibility were studied. This networked morphology of the high-temperature-resistant resin prevents the molecular creeping behavior of photovoltaic donors at high temperatures and improves the stability of OPV devices. The chain entanglement effect between polyarylene ethers also prevents the breaking behavior of photovoltaic donor-acceptor molecules under high tensile strength, improving the tensile properties of the active layer and the flexibility of the device. This study was the first to use in-situ wide-angle X-ray diffraction tensile tests to characterize the tensile deformation behavior of photovoltaic active layer films. The study found that the high temperature resistant polyarylether resin may have an electron tunneling effect in the active layer of the donor, so the above strategy does not significantly reduce the photoelectric conversion efficiency of the device. On the basis that the photoelectric conversion efficiency (PCE) of the device is maintained at 15.17%, the elongation at break of the active layer can be as high as 25.07%, which is currently the highest value of high-efficiency organic solar cells (PCE>8%). The research work provides a general strategy for improving the stability and flexibility of OPV devices, and provides an effective method for its industrial application in the field of flexible energy in the future.
Dr. Han Jianhua of Advanced Organic Functional Materials and Devices Team of Qingdao Energy Institute and Dr. Bao Feng of Dalian University of Technology are co-first authors of the paper. The corresponding authors are Bao Xichang, Yang Renqiang (researcher of Qingdao Energy Institute), Wang Jinyan and Yang Chunming. The research work was supported by the Youth Promotion Association of the Chinese Academy of Sciences, the National Natural Science Foundation of China, and the State Key Laboratory of Fine Chemicals.
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