ZnO Spray-Pyrolyzed as Electron Selective Contact for Long Term Stable Planar CH3NH3PbI3 Perovskite Solar Cells
Thi Tuyen Ngo a, Ramon Tena-Zaera b, Iván Mora-Seró a
a Universitat Jaume I, Institute of Advanced Materials (INAM) - Spain, Avinguda de Vicent Sos Baynat, Castelló de la Plana, Spain
b CIDETEC, Parque Tecnológico de San Sebastián, Spain, Paseo de Miramón, 196, San Sebastián, Spain
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Benidorm, Spain, 2018 May 28th - 31st
Organizers: Emilio Palomares and Rene Janssen
Poster, Thi Tuyen Ngo, 252
Publication date: 21st February 2018

Perovskite solar cell (PSC) research has been attracting increasing attention in recent years. Since the initial report on solid state solar cells with efficiency of 9.7% in 2012. There has been increased number of publications in this area as well as fast increase of certified efficiencies which now exceed 22%. High efficiency of PSCs is evidently taking benefit from promising properties of perovskite absorbers such as high absorption over the visible range and long diffusion length. However electron selective contact plays an important role in the electron extraction efficiency which influences significantly to the performance of PSCs.

TiO2 is likely the most widely used electron selective contact in PSCs because of its chemical stability, easy preparation, matched energy levels with those of perovskite and its high transmittance in the visible range. However TiO2 based planar methylammonium lead iodine (MAPbI3) PSCs show relatively low long-term stability. Here we provided ZnO compact layers prepared by spray pyrolysis as ESC for PSCs. Our ZnO based planar MAPbI3 devices were not only stable in a humidity of 35% but also improved the performance even after more than 1 month of preparation, due to an increase of charge transfer at the ZnO interface as it has been characterized by Impedance Spectroscopy. The formation of ZnO depending on the preparation conditions such as gas flow, zinc acetate solution concentrations and substrate temperatures effects on the performance of stability of MAPbI3 solar cells were discussed in this study. We have also observed that long term structural evolution of perovskite film also depends on the ZnO substrate and its deposition method.

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