doi:10.3390/nano13142042engRoyo, RaquelSánchez, José G.Li, WenhuiMartinez-Ferrero, EugeniaPalomares, EmilioAndreu, RaquelFranco, SantiagoNovel spiro-core dopant-free hole transporting material for planar inverted Perovskite solar cellsART-2023-134471Hole-transporting materials (HTMs) have demonstrated their crucial role in promoting charge extraction, interface recombination, and device stability in perovskite solar cells (PSCs). Herein, we present the synthesis of a novel dopant-free spiro-type fluorine core-based HTM with four ethoxytriisopropylsilane groups (Syl-SC) for inverted planar perovskite solar cells (iPSCs). The thickness of the Syl-SC influences the performance of iPSCs. The best-performing iPSC is achieved with a 0.8 mg/mL Syl-SC solution (ca. 15 nm thick) and exhibits a power conversion efficiency (PCE) of 15.77%, with Jsc = 20.00 mA/cm2, Voc = 1.006 V, and FF = 80.10%. As compared to devices based on PEDOT:PSS, the iPSCs based on Syl-SC exhibit a higher Voc, leading to a higher PCE. Additionally, it has been found that Syl-SC can more effectively suppress charge interfacial recombination in comparison to PEDOT:PSS, which results in an improvement in fill factor. Therefore, Syl-SC, a facilely processed and efficient hole-transporting material, presents a promising cost-effective alternative for inverted perovskite solar cells.2023http://zaguan.unizar.es/record/12704810.3390/nano13142042http://zaguan.unizar.es/record/127048oai:zaguan.unizar.es:127048info:eu-repo/grantAgreement/ES/AGAUR/2021 SGR01261info:eu-repo/grantAgreement/ES/DGA/E47-23Rinfo:eu-repo/grantAgreement/ES/DGA-FEDER/E47-20Rinfo:eu-repo/grantAgreement/ES/MICINN/CEX2019-000925-Sinfo:eu-repo/grantAgreement/ES/MICINN/PID2019-104307GB-I00-AEI-10.13039-501100011033info:eu-repo/grantAgreement/ES/MICINN/PID2019-109389RB-I00Nanomaterials 13, 14 (2023), 2042 [15 pp.]byhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccess