Azatruxene-Based,Dumbbell-Shaped,Donor–π-Bridge–Donor Hole-Transporting Materials for Perovskite Solar Cells |
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Authors: | Luis A Illicachi Javier Urieta-Mora Dr Joaquín Calbo Dr Juan Aragó Cansu Igci Dr Inés García-Benito Dr Cristina Momblona Prof?Dr Braulio Insuasty Prof?Dr Alejandro Ortiz Dr Cristina Roldán-Carmona Dr Agustín Molina-Ontoria Prof?Dr Enrique Ortí Prof?Dr Nazario Martín Prof?Dr Mohammad Khaja Nazeeruddin |
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Institution: | 1. Center for Research and Innovation in Bioinformatics and Photonics-CIBioFi, Grupo de Investigación de Compuestos Heterocíclicos, Universidad del Valle, Calle 13 No. 100-00, Edificio E20, Cali, Colombia;2. Departamento Química Orgánica, Facultad C. C. Químicas, Universidad Complutense de Madrid, Av. Complutense s/n, 28040 Madrid, Spain;3. Instituto de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain;4. Group for Molecular Engineering of Functional Materials, EPFL VALAIS, 1951 Sion, Switzerland;5. IMDEA-Nanociencia, Universitaria de Cantoblanco, C/ Faraday 9, Ciudad, 28049 Madrid, Spain |
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Abstract: | Three novel donor–π-bridge–donor (D -π-D) hole-transporting materials (HTMs) featuring triazatruxene electron-donating units bridged by different 3,4-ethylenedioxythiophene (EDOT) π-conjugated linkers have been synthesized, characterized, and implemented in mesoporous perovskite solar cells (PSCs). The optoelectronic properties of the new dumbbell-shaped derivatives (DTTXs) are highly influenced by the chemical structure of the EDOT-based linker. Red-shifted absorption and emission and a stronger donor ability were observed in passing from DTTX-1 to DTTX-2 due to the extended π-conjugation. DTTX-3 featured an intramolecular charge transfer between the external triazatruxene units and the azomethine–EDOT central scaffold, resulting in a more pronounced redshift. The three new derivatives have been tested in combination with the state-of-the-art triple-cation perovskite (FAPbI3)0.87(MAPbBr3)0.13]0.92CsPbI3]0.08 in standard mesoporous PSCs. Remarkable power conversion efficiencies of 17.48 % and 18.30 % were measured for DTTX-1 and DTTX-2 , respectively, close to that measured for the benchmarking HTM spiro-OMeTAD (18.92 %), under 100 mA cm?2 AM 1.5G solar illumination. PSCs with DTTX-3 reached a PCE value of 12.68 %, which is attributed to the poorer film formation in comparison to DTTX-1 and DTTX-2 . These PCE values are in perfect agreement with the conductivity and hole mobility values determined for the new compounds and spiro-OMeTAD. Steady-state photoluminescence further confirmed the potential of DTTX-1 and DTTX-2 for hole-transport applications as an alternative to spiro-OMeTAD. |
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Keywords: | hole-transporting materials perovskites power conversion efficiency solar cells triazatruxene |
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