Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Hybrid organic inorganic perovskite materials have been gaining considerable attention due to their exceptional optoelectronic properties for in solar cell applications with certified power conversion efficiencies (PCE) approaching 25 % in less than 10 years. The rapid development in device performance is achieved by engineering the perovskite formulation and by improving the charge extraction at the contacts. However, lead halide perovskites suffer from uncontrolled ion migration and the interactions at the external contacts play a fundamental role in the hysteretic response and performance degradation kinetics1,2. In this work, we passivate the external interfaces by immobilizing migrating iodine ions with a thin Ag buffer layer placed between Spiro-OMeTAD/Au layers. Two configurations were investigated, (1) a reference FTO/compact-TiO2/meso-TiO2/MAPI/Spiro-OMeTAD/Au and (b) FTO/compact-TiO2/meso-TiO2/MAPI/Spiro-OMeTAD/Ag/Au. In the presence of an electrical field, iodine migration occurs and formation of AgI is irreversibly promoted. Devices containing a buffer layer of Ag show different dynamics for degradation as compared to reference devices with increased stability and hysteresis is totally suppressed. Sample preparation by unburying the reactive interface allows the analysis of the interface with the perovskite by XPS measurements. Finally, the kinetics of the layer formation is monitored by Impedance Spectroscopy in working devices allowing the identification of the resistive response of this layer. The present work represents a new approach to passivate the external interfaces in lead halide perovskites.
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