Person:
Urieta Mora, Javier

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First Name
Javier
Last Name
Urieta Mora
URI
https://hdl.handle.net/20.500.14352/82610
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Química Orgánica
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2018 - 201922020 - 20231
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Author: Martín León, Nazario × End date: 2023 ×

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Now showing 1 - 3 of 3
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    Influence of alkyl chain length on the photovoltaic properties of dithienopyran-based hole-transporting materials for perovskite solar cells
    (Journal of Materials Chemistry C, 2023) Caicedo Reina, Mauricio; Pérez Escribano, Manuel; Urieta Mora, Javier; García Benito, Inés; Calbo, Joaquín; Ortiz, Alejandro; Insuasty, Braulio; Molina Ontoria, Agustín; Ortí, Enrique; Nazario Martín; Martín León, Nazario
    A tailored design of asymmetric hole-transporting materials (HTMs) is reported with the synthesis of a family of new HTMs based on the use of the 5H-dithieno[3,2-b:20 ,30 -d]pyran (DTP) moiety endowed with donor p-methoxytriphenylamines. A complete experimental and theoretical characterization of the optoelectronic, electrochemical and thermal properties is presented, showing more marked differences in the latter prompted by the different length of the alkyl chains (ethyl, butyl or hexyl) attached to the DTP core. This chemical design plays an important role in the morphological behavior of the new HTMs, displaying a different ability for the deposition on the top surface of the perovskite layer in perovskite solar cells (PSCs), as evidenced by scanning electron microscopy. The photovoltaic performance of the new DTP-based HTMs is highly affected by this morphological behavior, resulting in a maximum power conversion efficiency (PCE) of 17.39% for the ethyl derivative (DTPA-Et) in planar devices in combination with the state-of-the-art triple cation perovskite [(FAPbI3)0.87(MAPbBr3)0.13]0.92[CsPbI3]0.08. Otherwise, the hexyl derivative (DTPA-Hex) showed a decreased value of PCE of 15.04% due to its higher dispersity in chlorobenzene, resulting in a less uniform and lower quality film. In comparison, the reference cell using spiro-OMeTAD reaches a maximum PCE of 18.06%. This work demonstrates that DTP is a good candidate for the preparation of HTMs with high hole mobilities for exploitation in efficient and stable PSCs.
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    Heteroatom Effect on Star-Shaped Hole-Transporting Materials for Perovskite Solar Cells
    (Advanced Functional Materials, 2018) García Benito, Inés; Zimmermann, Iwan; Urieta Mora, Javier; Aragó, Juan; Calbo, Joaquín; Perles Hernáez, Josefina; Sebastián Serrano, Álvaro; Serrano, Alvaro; Molina Ontoria, Agustín; Ortí, Enrique; Martín León, Nazario; Nazeeruddin, Mohammad Khaja
    Three new star-shaped hole-transporting materials (HTMs) incorporatingbenzotripyrrole, benzotrifuran, and benzotriselenophene central cores endowedwith three-armed triphenylamine moieties (BTP-1, BTF-1, and BTSe-1, respec-tively) are designed, synthesized, and implemented in perovskite solar cells(PSCs). The impact that the heteroatom-containing central scaffold has on theelectrochemical and photophysical properties, as well as on the photovoltaicperformance, is systematically investigated and compared with their sulfur-richanalogue (BTT-3). The new HTMs exhibit suitable highest-occupied molecularorbitals (HOMO) levels regarding the valence band of the perovskite, whichensure efficient hole extraction at the perovskite/HTM interface. The molecularstructures of BTF-1, BTT-3, and BTSe-1 are fully elucidated by single-crystal X-raycrystallography as toluene solvates. The optimized (FAPbI3)0.85(MAPbBr3)0.15-based perovskite solar cells employing the tailor-made, chalcogenide-basedHTMs exhibit remarkable power conversion efficiencies up to 18.5%, which arecomparable to the devices based on the benchmark spiro-OMeTAD. PSCs withBTP-1 exhibit a more limited power conversion efficiency of 15.5%, with notice-able hysteresis. This systematic study indicates that chalcogenide-based deriva-tives are promising HTM candidates to compete efficiently with spiro-OMeTAD.
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    Homo and Hetero Molecular 3D Nanographenes Employing a Cyclooctatetraene Scaffold
    (Journal of the American Chemical Society, 2019) Urieta Mora, Javier; Marcel Krug; Wiebke Alex; Josefina Perles; Fernández López, Israel; Agustín Molina-Ontoria; Dirk M. Guldi; Martín León, Nazario
    Two novel homo and hetero three-dimensional nanographenes, NG1 and NG2, featuring a cyclooctatetraene core are designed, synthesized, and characterized. A concise and efficient bottom-up methodology was employed during which 24 new carbon–carbon bonds were formed. By means of a Scholl reaction nanographenes with 53 fused rings are realized, which exhibited good solubility in common organic solvents. The resulting saddle-like structures of NG1 and NG2 are electron-rich and show good chemical and electrochemical stability. Their molecular structures are fully elucidated by single-crystal X-ray crystallography. From their crystal structure analysis is concluded that both nanographenes are chiral and crystallize as a racemic mixture. Our work was rounded-off by excited state investigations such as electron and energy transfer with electron-acceptors and -donors.