Perovskite Based Solar Cells with Multi-Walled Carbon Nanotubes (MWCNTs)/Carbon Back Contact
In this work we fabricated cell structure of FTO/TiO2/ CH3NH3PbI3-xClx/ MWCNTs-carbon as shown below in the schematic diagram (Figure 1). TiO2 compact layer improved adhesion between the meso-TiO2 layer and FTO surface to facilitate electron transfer and enhanced the efficiency of the photoelectrical conversion. Multi-walled carbon nanotubes/carbon paste back contact was used with polymeric binder. The output cell parameters achieved from current-voltage curve (Figure 2) were open circuit voltage of 0.72 V, short circuit current density of 11.62 mA/cm2, fill factor of 0.27 and power conversion efficiency of 2.3%.