Organic-inorganic Perovskite solar cells development and fabrication with laser ablation assisted synthesis in solution
Metal halide perovskite solar cells are emerging in the forefront of thin film photovoltaic technology for their efficient power conversion. The most limiting factor to their practical commercialization is the presence of photocurrent hysteresis that hampers stable operation in environmental conditions. This phenomenon is usually attributed to the presence of defects in the perovskite lattice that permit ionic motion across the solar cell architecture. We present, in the first two talks, new hybrids perovskite thin films with strongly reduced electrical hysteresis derived by the direct passivation of perovskite defects. This is achieved with a new synthesis of perovskite nanocrystals in which graphitic carbon is grown on their surfaces. We show that a charge transfer occurs between the carbon phase and lead iodide nanocrystals, which is mandatory for the passivation. The presented hybrid materials not only emphasize the central role of defects, but also provides a relevant alternative for the material synthesis in perovskite-based opto-electronic devices.
Furthermore, other few fundamental aspects in the fabrication of perovskite solar cells are related to the development of new hole transporting materials (HTMs) in order to overcome actually limitations of SPIRO-OMeTAD molecule, that is the most used and known HTM. The use of organic-inorganic ternary blends using CuSCN, P3HT and carbon nanotubes can retain stability and efficiency of cells for a prolonged period of time. The last talk highlights the chemical role of additives in standard HTM processing, a matter that is usually ignored during perovskite cell fabrication.
– 15.00: Welcome introduction (Prof. Alberto Bertucco, Director of Interdepartmental Center Giorgio Levi Cases, and Prof. Moreno Meneghetti, Coordinator of the OPERA-LC project)
– 15.15: Suppression of ionic motions in a perovskite thin film for opto-electronic applications (Dr. Francesco Lamberti, DISC/DII)
– 15.40 Causes and effects of the electrical hysteresis of the lead iodide perovskite obtained from laser ablated materials (Antonio Rizzo, DEI)
– 16.05: Carbon nanostructures for hybrid photovoltaics (Dr. Teresa Gatti, DISC)
– 16.30: Spiro-OMeTAD hole transporting material in perovskite solar cells: role of the tert-butylpyridine studied by EPR and Raman (Enrico Cescon, DISC)
– 16.55: round table (M.Meneghetti): work in progress and perspectives of the OPERA-LC project
(Note: Q&A will be encouraged during the talks)
30 maggio 2018 ore 15.00, Miolati Room, Department of Chemical Sciences, unipd
via marzolo 1, padova
Per Informazioni e modalità di partecipazione contattare il Dr. Francesco Lamberti: