Abstract
We report fully vacuum–processed perovskite solar cells with high open circuit voltage. All the layers in the solar cells including the perovskite active layer, hole extraction layers and electron extraction layers were deposited in the vacuum process. Use of molybdenum oxide (MoO3) as an interfacial layer and N,N′-Di(1-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine (NPB) as a hole transport material (HTM) for hole extraction resulted in a high open circuit voltage (VOC) of 1.12V. Due to the effective hole extraction and high VOC, the devices showed a maximum power conversion efficiency (PCE) of 13.7%. The vacuum processed perovskite solar cells showed relatively high reproducibility showing the average value of PCE of 11.1%.
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