Recently, Liu Shengzhong, researcher of the silicon-based solar cell research group of the Solar Energy Research Department, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhao Kui, professor of Shaanxi Normal University, and Aram Amassian, professor of the King Abdullah University of Science and Technology, in the perovskite The battery field has made new progress, and related research results have been published in Advanced Materials.
In recent years, organic-inorganic hybrid perovskite solar cells have received extensive attention because of their excellent photovoltaic performance. However, polycrystalline MAPbI3 perovskite films prepared at low temperatures have a large number of defects existing at their grain boundaries that cause carrier recombination. Affects the photoelectric conversion efficiency and stability of the battery devices. Based on this, the researchers introduced a semiconductor organic small molecule with a Lewis acid/base functional group in the MAPbI3 perovskite by anti-solvent modification technology, resulting in a device efficiency of 17.5%. Increased to 19.3%. Studies have found that Lewis acid-base adducts or halogen-fullerene radicals formed between semiconducting organic small molecules and perovskites can effectively passivate Pb2+ vacancies or Pb-I anti-site defects. The increase in the matching of the energy levels between the two helps to enhance the defect passivation and improve the carrier mobility.
In addition, the hydrophobic organic small molecules at the grain boundary can effectively resist the ingress of water vapor. After the device is placed in a relative humidity of 50% for 40 days, it still maintains an initial efficiency of over 80%. This work is to produce highly stable and stable calcium. Titanium ore solar cells provide more rational ideas and methods, and will also help to promote commercial applications of perovskite solar cells.
The research work was funded by the national key R&D program, the National Natural Science Foundation of China, the Central University Fund, the Ministry of Education '111 Introduction Program' and the 'Thousand Person Program' project.
