Recently, Liu Shengzhong, a researcher of the Thin Film Silicon Solar Cell Research Group (DNL1606), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Yang Dong, a researcher of Shaanxi Normal University, and Dr. Feng Jiangshan, made new progress in the research of flexible perovskite solar cells. Related results were published in "Advanced Materials" (Advanced Materials).
Flexible solar cells have attracted much attention due to their advantages of light weight, portable belt, easy transportation, and simple installation. The key parts of high-performance flexible perovskite solar cells are the low-temperature interface layer and the high-quality perovskite light-absorbing layer. The team achieved a series of results in the flexible perovskite battery by developing a low-temperature interface layer in the early stage: In 2015, the titanium oxide interface layer was deposited by room temperature magnetron sputtering, and the efficiency of the prepared flexible perovskite battery reached 15.07% ( Energy Environ. Sci.); 2016, the first application of ionic liquids as an interface layer to flexible perovskite batteries, to further enhance the efficiency of flexible perovskite batteries to 16.09% (Adv. Mater.).
Recently, the team used dimethyl sulfide as an additive to control the crystallization process of the perovskite light-absorbing layer to obtain a perovskite film with larger grain size, better crystallinity, and lower defect density. The efficiency of titanium ore solar cells is increased to 18.40%, and the efficiency of large area (1.2cm2) flexible perovskite solar cells is increased to 13.35%. In addition, the stability of the light absorption layer of the perovskite prepared by additives has been significantly increased. The battery efficiency can still maintain the original efficiency of 86% when placed at 35% humidity for 60 days, while the perovskite solar cells prepared without additives Under the same efficiency, only 50% of the original efficiency can be maintained. This research achievement is currently the highest efficiency of flexible perovskite batteries, and has laid an experimental and theoretical basis for the development of flexible perovskite solar cells.
The research work was supported by the National Key Research and Development Program, the Central University Fundamental Research Fund, the National Natural Science Foundation of China, the 111 Project, the National University Research Fund, the Yangtze River Scholars Innovation Team, and the National Thousand Talents Program.
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