Long term stability of the components of the device is important
parameters for solar cells. A preliminary stability test of perovskite
solar cells with TiOPc was carried out by storing the unsealed devices
in desiccator at room temperature for 360 h and testing them
once every 2–3 day. As shown in Fig. 9, the PCEs of the devices using
β-TiOPc and spiro-OMeTAD as HTMs were stable in the first
120 h, since the parameters remained constant. During the wholethe PCEs of the devices using
β-TiOPc and spiro-OMeTAD as HTMs were stable in the first
120 h, since the parameters remained constant. During the whole