The relevance of the mesoporous TiO2 nature as scaffold in MAPI (Methyl Ammonium Lead Iodide) Solar Cells: Acid vs Base TiO2 peptidization

Alba Matas Adams^a, Jose Manuel Marin-Beloqui^a, Emilio Palomares^a

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Alba Matas Adams, 355
Publication date: 5th February 2015

We report the use of TiO₂ nanoparticles as the scaffold material in MAPI (Methyl Ammonium Lead Iodide) solar cells using two distinct synthetic routes for the preparation of the nanoparticles. Transmission Electron Microscopy (TEM), X-Ray Difracttion (XRD) and gas adsorption techniques (BET) were carried out to completely analyse the differences in crystal morphology, film surface area as well as other related physicochemical properties from the material MAPI solar were fabricated using the following architetecture: FTO/d-TiO₂/mp-TiO₂/CH₃NH₃PbCl_xI_3-x/OMeTAD/Au. Advanced optoelectronic techniques such as Photo-Induced Charge Extraction (PICE), Photo-induced Transient Photo-Voltage (PIT-PV) and Photo-Induced Transient PhotoCurrent (PIT-PC) were carried out in efficient devices to understand the device properties observed. Cells with efficiencies over 10% were achieved using TiO₂ nanoparticles from the acidic route synthesis. However, with the basic synthetic route the efficiencies show a decrease. The differences between both types of TiO₂ scaffolds can be explained from the results achieved using, PICE, PIT-PV and PIT-PC.
Figure1. JV curves and efficiencies of Perovskite solar cells with the np-TiO2 used in the work (comercial, acid and basic)

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