Air vapour techniques to fabricate planar and mesoporous structure perovskite solar cell

Aldo Di Carlo^a, Andrea Reale^a, Simone Casaluci^a, Surendra Yadav^a, Lucio Cinà^a, Adam Pockett ^b, Peter Kubiak ^b, Ralf Niemann ^b, Petra Cameron^b

^aCHOSE - Centre for Hybrid and Organic Solar Energy, University of Rome ‘‘Tor Vergata’’, Via del Politecnico, 1, Roma, Italy

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, Simone Casaluci, 253
Publication date: 5th February 2015

In this work we present an alternative two step deposition technique using vapor-assisted solution processing to fabricate perovskite solar cells (PSCs). Our methodology, called vacuum-vapor assisted solution processing V-VASP, has been developed to avoid the use of a glove box or an inert environment during the perovskite film preparation. In fact, the perovskite active layer is performed in air without using high-vacuum and other expensive high temperature equipment. In the first step, we optimized the annealing time of PbI₂ in air using different solvents such as γ-butyrolactone (GBL), N,N-Dimethylformamide (DMF) or Dimethyl sulfoxide (DMSO). The best PbI₂ solvent and its annealing time was found by analyzing the XRD spectra. In the second step we optimized the growth time of the perovskite layer for both planar and mesoscopic PSCs. We report a very rapid formation, only 30 minutes, of the perovskite layer and we obtained a maximum efficiency of 12.7% for the planar structure. Furthermore, by using the XRD spectroscopy, we demonstrated that the CH₃NH₃PbI₃ layer prepared using the V-VASP procedure shows greater stability if stored in air (20°C, humidity around 50%) for 14 days without encapsulation. Finally we have analyzed the cells in more detail using large amplitude photocurrent and photovoltage transient spectroscopy.

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