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Electron-transporting material based on perylene diimide small molecule for high efficiency perovskite solar cells using undoped P3HT as hole-transporting material.

ChemSusChem 2019 January 12
Perylene diimide based small molecules are widely used as intermediates of liquid crystals due to the high planarity and electron mobility. In this work, a small molecule tetrachloro-perylene diimide (TCl-PDI) replacing TiO2 served as electron-transporting material (ETM) for the planar perovskite solar cells (PVSCs). Among hole-transporting materials of PVSCs, poly(3-hexylthiophene) (P3HT) endows the devices highest stability and reproducibility. Therefore, the PVSCs with the structure of ITO/electron-transporting layer/perovskite/P3HT/MoO3/Ag was used to value the performances of new ETMs. The reference devices with compact TiO2 and P3HT display a reasonable power conversion efficiency (PCE) of 12.78%. While the PVSCs using TCl-PDI as ETM exhibit a promising PCE of 14.73%, among the highest values of the literatures reported on the PVSCs using undoped P3HT. Moreover, TCl-PDI based devices display higher stability than that of the devices based on compact TiO2 due to the superior perovskite quality.

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