Recently, Prof. Yixin.Zhao’s research group from school of environmental science and engineering in SJTU report a recorded high efficiency all-inorganic perovskite stabilized by (110) oriented 2D perovskite on Science Advances（Science Advances2017,3(9), e1700841. This is another research breakthrough reported by this group, who had published more than 30 research papers on perovskite solar cells in top journals including Nature Communications, Chem,Soc, Rev., JACS, Angew.Chem.Int., Ed., Nano lett. Adv. Func.Mater., Nano Energy etc.
Recently, organic inorganic hybrid perovskite solar cells has become one of most promising photovoltaics techniques to achieve high efficiency and low cost device. Among them, all-inorganic cesium lead iodide perovskite materials is an ideal choice for tandem solar cells due to its high thermal stability and suitable band gap. However, Cesium lead iodide perovskitesface two big challenges: firstly, it need high temperature anneal to crystallization, secondly, it would phase transfer into non-perovskite phase with poor photoelectric properties at room temperature. Prof. Zhao and his research develop several strategy to overcome these two challenges. They first replaced the regular PbI2 precursor with a novel precursor of PbI2.xHI, which can greatly reduce the perovskite phase crystallization temperature down to 100 oC. Furthermore, a (110) oriented 2D perovskite based on ethylenediamine lead iodide, a two-dimensional perovskite component based on diamine cations, was introduced to CsPbI3 perovskite. The addition of 2D perovskite not only reduce the grain size of all inorganic cesium lead iodine perovskite but also significantly stabilize perovskite phase at room temperature. In this way, the high-efficiency inorganic perovskite solar cell with 11.8% conversion efficiency was successfully obtained which is a recorded highest conversion efficiency for solution processed all-inorganic perovskite solar cells. What’s more, the phase stability of the perovskite films prepared by this method has been greatly improved, which were stable for several months at room temperature and stable at 100o C for week as well.
Science Advances is a magazine covering all academic fields (including computer, engineering, environment, life, mathematics, physics and Social Science) open, comprehensive science publications, aimed at providing a top scientific research publishing platform for publishing the breakthrough in the field of scientific research rapidly.
The research was financially supported by the National Natural Science Foundation of China, the National Youth thousand aid program, the Henry Fok foundation and the third stage of the 985 project of SJTU.
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