Tin oxide has made a major breakthrough in high-efficiency perovskite solar cells (PSCs) as an efficient electron transport layer by the low-temperature chemical bath deposition method. However, tin oxide often contains pernicious defects, resulting in unsatisfactory performance. Herein, we develop high-quality tin oxide films via a nitrogen-doping strategy for high-efficiency and stable planar PSCs. The aligned energy level at the interface of doped SnO 2 /perovskite, more excellent charge extraction and reduced nonradiative recombination contribute to the enhanced efficiency and stability. Correspondingly, the power conversion efficiency of the devices based on N-SnO 2 film increases to 23.41% from 20.55% of the devices based on the pristine SnO 2 . The N-SnO 2 devices show an outstanding stability retaining 97.8% of the initial efficiency after steady-state output at a maximum power point for 600 s under standard AM1.5G continuous illumination without encapsulation, while less than 50% efficiency remains for the devices based on pristine SnO 2 . This simple scalable strategy has shown great promise toward highly efficient and stable PSCs.

This paper takes butyl acrylate(BA) and 2-ethylhexyl acrylate(2-EHA) as the soft monomers, vinyl acetate(VAC) as the hard monomer of pressure-sensitive adhesive and acrylamide(AM) and acrylic acid(AA) as the raw materials of modified monomer to synthesize pressure-sensitive adhesive to carry out Fourier Transform Infrared Spectroscopy(FTIR)characterization. In order to satisfy some special requirements and improve its adhesive property, this paper uses metakaolin and metakaolin modified with silane couling agent KH570 to carry out mechanical blending with pressure-sensitive adhesive respectively and prepare composite acrylic pressure-sensitive adhesive. This paper tests the viscosity of composite pressure-sensitive adhesive with metakaolin and modified metakaolin. It is found that with the increase of doping content, the viscosity will be increased accordingly and the viscosity of composite pressure-sensitive adhesive with modified metakaolin has a larger growth. The adhesive property indicates that composite pressure-sensitive adhesive with KH570 modified metakaolin has an obviously better adhesive property than that with unmodified metakaolin, and when 0.8wt% of modified metakaolin is added, inorganic/organic composite acrylic pressuresensitive adhesive has the best comprehensive adhesive property.