Interface Engineering of Electron and Hole Transport Layers on the Performance of Perovskite Solar Cells
(Room Room 104-A)
29 Apr 19
2:40 PM
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3:00 PM
Tracks:
Coatings for Energy Conversion and Related Processes
Implementing earth abundant carbon as an electron transport layer is a promising approach to develop cost-effective perovskite solar cells. We have coated an ultra-thin carbon layer in combination with PCBM, which enhances the performance of CH3NH3PbI3-xClx based perovskite solar cells. Particularly, the carbon layer was coated using e-beam evaporation technique. Quantitative analysis of the charge dynamics revealed that this novel PCBM/carbon layer effectively increased the charge extraction and improved interface defect passivation, series and shunt resistance as compared to the PCBM/C60 layer. Hence, the photo-conversion efficiency of the device increased from 14% for the PCBM/C60 layer to 16% for the PCBM/carbon layer. Another interface engineering approach involves the introduction of quick, inexpensive, and most importantly non-toxic methodology to fabricate the recent most popular NiO based hole transport layer. We have introduced a facile fabrication method of densely-packed, less defective NiO films following hot-casting technique. Interestingly, hot-casting temperatures have a significant impact on the surface morphology, surface defects, and film coverage. A hot-casting temperature above 100 °C exhibited ordered chemistry with strong Ni-O octahedral bonding and improved charge extraction at the NiO/perovskite interface. Finally, Perovskite solar cells with the structure FTO/NiO/Perovskite/PCBM/C/Ag exhibits 17.4% efficiency with negligible light soaking effect and hysteresis.