Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.104
Publication date: 11th July 2022
Here we report a detailed study at the interface for dipole molecule treated inorganic perovskite CsPbI3 based solar cells. An energy level band bending at the passivated CsPbI3 perovskite and hole selective contact interface was introduced by a dipole molecule, trioctylphosphine oxide. X-ray photoelectron Spectroscopy (XPS) study shows binding energy shifts towards lower value, which indicating the acceptance of electrons from perovskite to TOPO, similar to the role as a Lewis acid. The upward shifts in work function in TOPO-treated samples, as compared to the control sample, has been revealed by Ultraviolet Photoelectron Spectroscopy (UPS) and Kelvin Probe measurements independently. Steady-state Photoluminescence (PL) and Time-resolved Photoluminescence Spectroscopy (trPL) measurements show that the dipole molecule contributes marginally to defects passivation of perovskite films. Charge dynamics at the interface was characterized by using transient Surface Photovoltage Spectroscopy (trSPV) at varied photon energies. The charge selectivity at the interface is increased by over six times for TOPO treated samples. Finally, a champion efficiency of 18.7% has been achieved for CsPbI3 perovskite solar cells with an increase of 100 mV in average in open-circuit voltage. Influence of dipole treatment on long-term stability of these devices were characterized by maximum power point tracking of over 500 hours under 1 sun intensity at room temperature with cycled illumination. It has been seen that due to better energy alignment at the interface, dipole molecule treated samples shows a better stability as compared to control CsPbI3 based devices.
Zafar iqbal acknowledges the Deutscher Akademischer Austauschdienst (DAAD) scholarship for the financial support for his PhD study at Helmholtz Zentrum Berlin.We acknowledge HyPerCells (a joint graduate school of the University of Potsdam and the Helmholtz-Zentrum Berlin).
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