We report on solid-state mesoscopic heterojunction solar cells employing nanoparticles (NPs) of methyl ammonium lead iodide (CH3NH3)PbI3 as light harvesters. The perovskite NPs were produced by reaction of methylammonium iodide with PbI2 and deposited onto a submicron-thick mesoscopic TiO2 film, whose pores were infiltrated with the hole-conductor spiro-MeOTAD. Illumination with standard AM-1.5 sunlight generated large photocurrents (JSC) exceeding 17 mA/cm2, an open circuit photovoltage (VOC) of 0.888 V and a fill factor (FF) of 0.62 yielding a power conversion efficiency (PCE) of 9.7%, the highest reported to date for such cells. Femto second laser studies combined with photo-induced absorption measurements showed charge separation to proceed via hole injection from the excited (CH3NH3)PbI3 NPs into the spiro-MeOTAD followed by electron transfer to the mesoscopic TiO2 film. The use of a solid hole conductor dramatically improved the device stability compared to (CH3NH3)PbI3 -sensitized liquid junction cells.
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机译:我们报告固态介观异质结太阳能电池采用甲基铵碘化铅(CH3NH3)PbI3的纳米粒子(NPs)作为光收集器。钙钛矿纳米粒子是由碘化甲基铵与PbI2反应制得的,并沉积在亚微米厚的介观TiO2薄膜上,该薄膜的孔被空穴导体spiro-MeOTAD渗透。在标准AM-1.5阳光下照明产生的大光电流(JSC)超过17 mA / cm 2 sup>,开路光电压(VOC)为0.888 V,填充系数(FF)为0.62,从而产生了功率转换效率(PCE)为9.7%,是此类电池迄今报道的最高效率。 Femto的第二次激光研究与光诱导吸收测量相结合,表明电荷分离是通过将空穴从受激发的(CH3NH3)PbI3 NP注入到Spiro-MeOTAD中进行的,然后电子转移到介观的TiO2薄膜中。与(CH3NH3)PbI3敏化的液体结电池相比,使用实心空穴导体显着提高了器件的稳定性。
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