Perovskite Solar Cells Based on 1D/0D Ordered Composite SnO2 Nanocrystal

Novel 1D/0D ordered composite SnO2 nanocrystal electron transport layer (ETL) for pervoskite solar cells has been prepared by adjusting the density of one-dimensional (1D) nanorod arrays through adding functional additives in hydrothermal precursors, followed by depositing zero-dimensional (0D) nanoparticles between the nanorods. The effect of the NaCl additives in the precursor and the subsequent deposition of nanoparticles on the morphology, optical and interfacial charge transfer properties of the composite ETL was systematically studied, and the mechanism of the above effects on the photovoltaic performance of the device was discussed. The results show that the addition of NaCl in the precursor thins the rods' density, so that the following 0D nanoparticles penetrated smoothly into the gaps of 1D nanorods, inducing the obvious inhibitory effect on the perovskite/ETL and perovskite/FTO interface charge recombination, which is the direct reason for the increase in open circuit voltage and fill factor of the device. In summary, the excellent charge recombination inhibition (composite resistance was 2.9 times that of conventional 1D nanorod arrays ETL-2Cl) and efficient electron extraction performance (extraction rate and efficiency were 3.03x10(7) s(-1) and 91.6%, respectively) of the novel 1D/0D ordered composite ETL-2P contributed to the better photoelectric performance of the device (with photoelectric efficiency of 12.15%).

Automated summary

A novel 1D/0D ordered composite SnO2 nanocrystal electron transport layer (ETL) for pervoskite solar cells was prepared by adjusting the density of one-dimensional (1D) nanorod arrays and depositing zero-dimensional (0D) nanoparticles. The composite ETL showed excellent charge recombination inhibition and efficient electron extraction performance, contributing to improved photoelectric performance of the device.