Impact of Flash Infrared Annealing on Growth and Photophysics of MAPbI3 Perovskite
Loreta Angela Muscarella a, Sandy Sanchez b, Andries Lof a, Michael Saliba b, Bruno Ehrler a
a AMOLF Institute, Science Park, Amsterdam
b Adolphe Merkle Institute, Chemins des Verdiers 4, CH-1700 Fribourg
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Loreta Angela Muscarella, 004
Publication date: 11th February 2019

Flash Infrared Annealing (FIRA) method results in pinhole-free layers with micrometer‐size crystalline domains without the use of the antisolvent or any other chemical additives. The fast annealing times (1.7s), and comparable solar cell efficiency compared to the traditional antisolvent-fabricated perovskites make FIRA highly promising for the scale‐up of perovskite solar cells as it is compatible with roll-to-roll methods  available  on  the  market,  such  as  doctor-blading,  slot-casting. In this work we investigate how the Flash Infrared Annealing affects the crystal growth of MAPbI3 and its dependence on the substrates used (FTO, ITO, Quartz, compact and mesoporous TiO2). We measure the grain size, crystal structure and orientation using Electron Back-Scattered Diffraction (EBSD). We find a highly oriented structure for perovskite annealed by FIRA along the (112) and (224) directions, unusual for MAPbI3 thin films but typically shown by MAPbI3 single crystals, and a consistent crystal rotation within perovskite grains. Besides, we study how the structural properties of the resulting films affect its photophysics. Combining photoluminescence lifetime and spectral maps we show how the growth method affects the steady-state and dynamic optical properties of the resulting films. Our findings directly relate structural properties to the photophysics of lead halide perovskites.

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