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Pyrolysis preparation of WO3 thin films using ammonium metatungstate DMF_water solution for efficient compact layers in planar perovskite solar cells
The tungsten trioxide(WO3) thin films were firstly prepared by spin-coating-pyrolysis methods using the ammonium metatungstate((NH4)6H2W12O40)DMF/water solution, and successfully applied as the efficient compact layers for the planar perovskite solar cells. The influence of the WO3 film thickness and the rinsing treatment of CH3NH3 PbI3 thin film with isopropanol on the photovoltaic performance of the corresponding perovskite solar cells was systematically investigated. The results revealed that the perovskite solar cell with a 62 nm thick WO3 compact layer achieved a photoelectric conversion efficiency of 5.72%, with a short circuit photocurrent density of 17.39 m A/cm2, an open circuit voltage of 0.58 V and a fill factor of 0.57. The photoelectric conversion efficiency was improved from 5.72% to 7.04% by the isopropanol rinsing treatment.

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