Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
Publication date: 22nd December 2022
Hybrid lead halide perovskite materials are very promising candidates to outperform Silicon-based modules and led the photovoltaic market.1 However, despite their very promising properties, these materials show some drawbacks such as lack of stability and the presence of toxic Pb in their structure. So far, tin halide perovskite solar cells (THPSCs) have proven to be the most promising candidates to replace Pb-based perovskite solar cells due to their excellent optoelectronic properties and low toxicity. Nevertheless, their instability is even higher than that of their lead-based counterparts, causing rapid degradation and a large drop in efficiency under ambient conditions exposure.2 To mitigate these problems, in this work we present the synthesis and characterization of two new organic monomers (OM_4 and OM_6) that have been incorporated into THPSCs as passivating agents. Both monomers were designed with two acrylate moieties in their backbones to allow the polymerization process and display a different core, one with a pyridine functional group (Lewis base) and the other with a 1,2,4,5-tetrafluorobenzene (Lewis acid) moiety. This different functionality allows us to study and compare the effect of the incorporation of Lewis acids and bases in THPSCs. In this way, upon addition of the organic monomers into the perovskite films, they both exhibited excellent optical properties overcoming pristine FASnI3 film and their incorporation also resulted in the formation of smooth, pinhole-free perovskite layers which, in turn, led to a significant increase in the power conversion efficiency (PCE).
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