2026-08-17T10:04:38Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/933712025-03-18T13:17:22Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Sandoval-Torrientes, Rafael author Zimmermann, Iwan author Calbo, Joaquín author Aragó, Juan author Santos, Juan author Ortí, Enrique author Martín León, Nazario author Nazeeruddin, Mohammad 2024-01-16T12:47:04Z 2024-01-16T12:47:04Z 2018 Sandoval-Torrientes, R., et al. «Hole Transporting Materials Based on Benzodithiophene and Dithienopyrrole Cores for Efficient Perovskite Solar Cells». Journal of Materials Chemistry A, vol. 6, n.o 14, 2018, pp. 5944-51. https://doi.org/10.1039/C7TA11314E. 2050-7488 10.1039/c7ta11314e https://hdl.handle.net/20.500.14352/93371 2050-7496 https://doi.org/10.1039/C7TA11314E The development of highly efficient hole transporting materials (HTMs) for perovskite solar cells (PSCs) is still one of the most thrilling research subjects in the development of this emerging photovoltaic technology. Inner ring engineering of the aromatic core of new HTMs –consisting in three fused rings endowed with four triarylamine units– reveals major performance effects over the fabricated devices. In particular, substitution of the central pyrrole ring in dithienopyrrole (DTP) by a benzene ring –benzodithiophene (BDT)– allows enhancing the power conversion efficiency from 15.6% to 18.1%, in devices employing mixed-perovskite (FAPbI3)0.85(MAPbBr3)0.15 (MA: CH3NH3 +, FA: NH=CHNH3 +) under 1 sun illumination. In comparison, 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) yielded 17.7%. The novel HTM molecules show an efficient quenching of the perovskite photoluminescence, indicating an efficient charge transfer from the active layer to the HTM, along with a good conductivity (comparable to that of spiro-OMeTAD reference). Density functional theory (DFT) calculations allowed rationalizing the electrochemical and optical properties, and predict a reorganization energy (λ) for the best performing BDT-based HTM (0.101 eV) significantly lower than that computed for the benchmark spiro-OMeTAD (0.139 eV). eng Hole transporting materials based on benzodithiophene and dithienopyrrole cores for efficient perovskite solar cells journal article 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