Pyrolysis preparation of WO_3 thin films using ammonium metatungstate DMF/water solution for efficient compact layers in planar perovskite solar cells

摘要

The tungsten trioxide (WO_3) thin films were firstly prepared by spin-coating-pyrolysis methods using the ammonium metatungstate ((NH_4)_6H_2W_(12)O_(40)) DMF/water solution, and successfully applied as the efficient compact layers for the planar perovskite solar cells. The influence of the WO_3 film thickness and the rinsing treatment of CH_3NH_3PbI_3 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 WO_3 compact layer achieved a photoelectric conversion efficiency of 5.72%, with a short circuit photocurrent density of 17.39 mA/cm~2, 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.