Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.077
Publication date: 22nd December 2022
Engineering the chemical composition of metal-halide perovskites via halide mixing allows a facile bandgap modulation but renders perovskite materials prone to photoinduced halide segregation.[1] Triple-halide alloys containing Cl, I,
and Br were recently reported as a means to stabilize CsyFA1–yPb(BrxI1–x)3 perovskite under illumination.[2] Herein, these triple-halide alloys are found to be intrinsically less stable with respect to the reference I-Br in ambient conditions. By exploiting the influence of low-molecular-weight organic gelators on the crystallization of the perovskite material, a triple-halide alloy with improved moisture tolerance and thermal stability at temperatures as high as 120 °C is demonstrated.
The hydroxyl-terminated organic gelators are found to aggregate into nanoscale fibers and promote the gelation of the solvent inducing the formation of a 3D network, positively interfering with perovskite solidification. The addition
of a tiny amount of organic gelators imparts a more compact morphology, higher crystallinity, and compositional stability to the resulting triple-halide polycrystalline films, making them more robust over time without compromising the
photovoltaic performance.[3] Overall, this approach offers a solution toward fabrication of active perovskite materials with higher energy gap and improved stability, making these triple-halide alloys truly exploitable in solar cells.
The authors gratefully acknowledge the project Best4U-“Tecnologia per celle solari bifacciali ad alta Efficienza a 4 terminali per utility scale” founded by the Italian Ministry of University ad Scientific Research (MIUR), Bando PON R&I 2014-2020 e FSC “Avviso per la presentazione di Progetti di Ricerca Industriale e Sviluppo Sperimentale nelle 12 aree di Specializzazione individuate dal PNR 2015-2020”-decreto concessione agevolazione protocollo 991 del 21 maggio 2019 MIUR (Contract number: PON ARS01_00519; CUP B88D19000160005). The authors gratefully acknowledge the project “Mission Innovation, IEMAP” founded by Ministero della Transizione Ecologica, MiTE (CUP B82C21001820001). This activity was partially supported at CNR by the national project VertiGrow (CUP B15F21004410005). S.C. acknowledges project Ricerca@Cnr PHOTOCAT (CUP B93C21000060006).
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