In this study, we implement a laser patterning process on organic-inorganic hybrid perovskite (OIHP) film and perform systematical investigation on the effects of aperture ratios. Through careful aperture ratio control and by using indium tin oxide (ITO) transparent electrode, we can fabricate neutral-colored semitransparent OIHP solar cells. Furthermore, we show that a LiF interlayer between OIHP and C60 electron transport layer (ETL) plays a bifunctional role of interface passivation and current flow rectification. Consequently, we demonstrate a high efficiency of 12.83 % power conversion efficiency (PCE) from a 2.00 cm2 and 9.30 % PCE from 36.00 cm2 area, with 21.74 % average visible transmittance (AVT). In addition, the neutral-colored semitransparent solar cell retains 89.02 % of its initial efficiency after 1,000 hours in dry-air storage without encapsulation.
In this study, efficient perovskite solar cells are prepared by using acetylacetone modified TiO2 nanoparticles (Acac-TiO2) as electron transporting layer (ETL). Acetylacetone suppresses Ti-OH surface defects by donating lone pair electrons and simultaneously drives conduction band of Acac-TiO2 and enhance energy band alignment with respect to perovskite. Accordingly, Acac-TiO2 based solar cell exhibits a high 21.20% PCE due to enhanced charge extraction and reduced defect density. Additionally, by adopting low temperature processed Acac-TiO2, we demonstrate flexible PSCs with 18.01% PCE and excellent mechanical stability, retaining 74.5% and 67.1% PCE after 5,000 bending cycles in outward and inward direction.
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