Proceedings of International online conference on Hybrid materials and optoelectronic devices (HYBRIDOE)
Publication date: 4th December 2020
Perovskite solar cells (PSCs) have seen a rapid rise in power conversion efficiency (PCE) over the period of just a decade. However, perovskite compounds suffer from structural defects such as - undercoordinated ions at the surface, which limits the overall photovoltaic performances. Herein, we utilized two β-diketone Lewis base additives within the antisolvent to chemically passivate the undercoordinated Pb2+ defects in the perovskite films via a one-step spin-coating process. The two β-diketone passivators could successfully interact with Pb2+ defects by forming a coordination bond using the two carbonyl groups. We confirmed the interaction between the additives and the perovskite film by measuring the FTIR for the modified perovskite films, which showed a clear peak for C═O group. Compared to the pristine MAPbI3 films, the passivated perovskite films fabricated with β-diketone Lewis base additives show enhanced photoluminescence intensity and improved perovskite film quality, which are credited to the suppression of the defect. The incorporation of the two β-diketone passivators could successfully enhanced the PCE by 45% for the β-diketone passivated devices compared to the pristine device.
A.I. acknowledges the support from JSPS KAKENHI grant no. 18H02079. M. A-S thanks the Egyptian Ministry of Higher Education & Scientific Research for the financial support through the Egypt-Japan Education Partnership (EJEP)-3rd call.
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