Here, we report a scalable ultrasonic
spray deposition under ambient
conditions to fabricate a CsPbI2Br-based all-inorganic
perovskite thin film for photovoltaic applications. With the cooperated
aid of vacuum extraction of the as-fabricated perovskite film and
the incorporation of lead(II) acetate (Pb(Ac)2) additive
to the precursor solution, the quality of the perovskite film dramatically
improved from the filled pinholes between the crystal grain with enhanced
perovskite crystallinity. We found that the champion device for the
5% Pb(Ac)2-doped CsPbI2Br perovskite film combined
with vacuum extraction achieved the best power conversion efficiency
(PCE) of 10.06%, arising from the efficient defect dissipation within
the film and the reduction in the charge recombination loss. Simultaneously,
the thermal stability was boosted with the incorporation of Pb(Ac)2 after aging at 85 °C for 10 days. We believe that the
spray-coating process combined with the optimization of the all-inorganic
perovskite film will help in the fabrication of a photoabsorbing layer
for the future industrial upscaling of perovskite solar cells.
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