Interfacial behavior of Methyl Ammonium Lead Iodide and TiO2

Juan Pablo Correa^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, Juan Pablo Correa, 224
Publication date: 5th February 2015

Perovskite materials that are able to absorb light throughout the visible range of the solar spectrum and that transport both electrons and holes have attracted much attention in the recent years. Methyl ammonium lead iodideperovskite, in particular, has been at the epicenter of this emerging field. In a typical device architecture, the perovskite material absorbs light and injects electrons and holes into the electron selective layer (typically TiO2) and the hole transporting material (typically Spiro-OMeTAD), respectively. The interface between the perovskite layer and TiO2 has been the subject of a heated debate because it seems to be necessary to achieve high power conversion efficiencies. However, the mechanisms that determine this behavior are not yet well understood. Here, we fabricate perovskite devices based on mesoporous alumina scaffolds with and without a 3 nm TiO2 shell. We study theperformance and electronic dynamics of this system to better understand the role of TiO2 in transport and recombination kinetics.

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