New Bifunctional Additives For Tin Halide Perovskites
Łukasz Przypis a, Wiktor Żuraw a b, Robert Kudrawiec b, Artur Herman b
a Saule Research Institute, Wroclaw Technology Park, 11 Dúnska Str., Sigma building, Wroclaw, PL 54-427, Poland
b Department of Semiconductor Materials Engineering, Wrocław University of Science and Technology, Wyspiańskiego 27, Wrocław 50-370, Poland
nanoGe Fall Meeting
Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
#PbFreePero - The potential of lead-free perovskites: synthesis, properties, and applications
Barcelona, Spain, 2022 October 24th - 28th
Organizers: Loreta Muscarella, Eline Hutter and Henk Bolink
Poster, Artur Herman, 323
Publication date: 11th July 2022

Unique combination of optoelectronic properties of metal halide perovskites (MHPs) together with facile processing made them probably the most exciting group of materials for next generation optoelectronics and photocatalysis. However, as there is no rose without a thorn, initial excitement about subsequent PCE record breaking Pb-based MHPs solar cells was accompanied by rising concerns about lead’s bioavailability, toxicity and life-cycle of the devices. On the other hand commercialization of significantly less toxic Sn-based MHPs showing even more suitable bandgaps for the efficient use of solar energy is hampered by capricious chemical nature of Sn(II). The efforts toward more stable tin-based perovskites are mostly focused on the improvement of crystallization process, and the use of appropriate additives (2D, antioxidants, passivants). The rational design of new additives for processing MHP is a complex subject as many different factors regarding the chemical properties must be considered, for example, the solubility of the additives in precursor solution or the possibility of formation of stable complexes with the organic and inorganic components of the salts.[1,2]

Herein, we report the use of series of large organic cations carrying diverse functional groups for improved stability of tin halide perovskites. We investigated optical and structural properties of spin coated FASnI3 thin films with and without the additives under different conditions (inter alia vacuum, inert/atmosphere vs. ambient air, illumination and temperature).

Authors thank National Science Centre for funding in the framework of Opus programme 2020/39/B/ST3/02704

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