Factors influencing the stability of perovskite solar cells

In 2009, organic-inorganic hybrid perovskite was first used as the light-absorbing material for solar cells. The increased efficiency, simple preparation process, and low cost have aroused widespread concern. The last five years witnessed the increase of the power conversion efficiency in the organic-inorganic hybrid perovskite solar cells from to 19.3%. At present, most researches focus on how to improve the photoelectric conversion efficiency rather than stability. With the improvement of the power conversion efficiency, people have realized that the long-term stability also one of the key issues in practical applications. The present preliminary researches indicate that there are two main factors connected with the stability. One the stability of the perovskite materials, including thermal stability and humidity stability; the other is the stability solar devices, mainly related to the design and optimization of devices' structure. To solve the problems of stability perovskite materials, the main point is its crystal structure. Based on the tolerance factor related to the stability of perovskite lattice structure, choosing a more suitable size of the moiety can reduce its sensitivity to humidity and its stability. To design the device structure, we should try to select a hydrophobic material to protect the materials from being affected by the surrounding environment. Researches have so far showed that by optimizing design of the solar cell structure via combining the elements utilized and the bonding interface work, the stability of hybrid perovskites solar cell is supposed to be entirely solved, and this will determine the practical process of perovskite photovoltaic materials. However, by the moment, the study on stability of perovskite solar cells is far being sufficient.