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SiO_2 nanoparticle-regulated crystallization of lead halide perovskite and improved efficiency of carbon-electrode-based low-temperature planar perovskite solar cells

梁泽荣  杨兵初  梅安意  林思远  韩宏伟  袁永波  谢海鹏  高永立  周聪华  
【摘要】:SiO_2 nanoparticles were used to regulate the crystallizing process of lead halide perovskite films prepared by the sequential deposition method, which was used in the low-temperature-processed, carbon-electrode-basing, hole-conductorfree planar perovskite solar cells. It was observed that, after adding small amount of SiO_2 precursor(1 vol%) into the lead iodide solution, performance parameters of open-circuit voltage, short-circuit current and fill factor were all upgraded,which helped to increase the power conversion efficiency(reverse scan) from 11.44(±1.83)%(optimized at 12.42%) to14.01(±2.14)%(optimized at 15.28%, AM 1.5 G, 100 m W/cm~2). Transient photocurrent decay curve measurements showed that, after the incorporation of SiO_2 nanoparticles, charge extraction was accelerated, while transient photovoltage decay and dark current curve tests both showed that recombination was retarded. The improvement is due to the improved crystallinity of the perovskite film. X-ray diffraction and scanning electron microscopy studies observed that, with incorporation of amorphous SiO_2 nanoparticles, smaller crystallites were obtained in lead iodide films, while larger crystallites were achieved in the final perovskite film. This study implies that amorphous SiO_2 nanoparticles could regulate the coarsening process of the perovskite film, which provides an effective method in obtaining high quality perovskite film.

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