Promotion of crystallisation for the organometal halide perovskite via a chemical catalyst at low temperature

Yaqub Rahaq^a

^aSheffield Hallam University, 5 Hampton Road, Sheffield, 0, Kuwait

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, Yaqub Rahaq, 338
Publication date: 5th February 2015

Low temperature planar heterojunction perovskite photovoltaic (PV) devices based on the solution-processed method have gained a lot of attentions in the past several years due to the advantages of simple architecture, easiness fabrication processes, and high energy conversion efficiency. There are two main methods that have recently been introduced to fabricate the solution processed planar heterojunction perovskite solar cells; i.e. 1) one- step method where the thin film of the organometal halide perovskite is synthesised via the mixed solution of metal halide and methylammonium iodide in the PV devices;. 2) two- step method where the thin film of the organometal halide perovskite is produced via reaction of depositing the methylammonium iodide on the previously deposited metal halide layer in the PV devices. The following thermal annealing plays a substantial role on realisation of the fully crystallised organometal halide perovskite. Currently, it takes more than one hour to obtain the crystallised organometal halide perovskite at low temperature of below 150oC, which is not compatible with the roll-to-roll production line. In this report, a chemical catalyst based on an inorganic-compound was found to significantly promote crystallisation of the organometal halide perovskite by doping it in the thin film of perovskites. The catalyst greatly reduced the crystallisation time of the perovskite material and enhanced its morphologies. Consequently, it paved the way to realise the purpose of fabricating the perovskite-based PV devices at low temperature using the roll-to-roll fabrication method.

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