RT Journal Article
T1 Saddle-like, π-conjugated, cyclooctatetrathiophene-based, hole-transporting material for perovskite solar cells
A1 Urieta-Mora, Javier
A1 García-Benito, Inés
A1 Zimmermann, Iwan
A1 Aragó, Juan
A1 Calbo, Joaquín
A1 Grancini, Giulia
A1 Molina Ontoria, Agustín
A1 Ortí, Enrique
A1 Martín León, Nazario
A1 Khaja Nazeeruddin, Mohammad
AB A flexible, saddle-like, π-conjugated skeleton composed of four fused thiophene rings forming a cyclooctatetrathiophene (CoTh) with four triphenylamines (CoTh-TTPA) is presented as a hole-transporting material (HTM) for perovskite solar cells. The new HTM shows a bright red color stemming from a direct conjugation between the TPA groups and the central CoTh scaffold. This results in a charge transfer band due to the combination of the weak acceptor moiety, the CoTh unit, and the electron-donating p-methoxytriphenylamine groups. CoTh-TTPA exhibits a suitable highest-occupied molecular orbital (HOMO) level in relation to the valence band edge of the perovskite, which ensures efficient hole extraction at the perovskite/HTM interface. It has been applied as the HTM in combination with a mixed perovskite ([FAPbI3]0.85[MAPbBr3]0.15) and a state-of-the-art triple cation perovskite ([(FAPbI3)0.87(MAPbBr3)0.13]0.92[CsPbI3]0.08) reaching noticeable light-to-energy conversion efficiencies of 16.3 and 15.9%, respectively. These values are slightly lower than those measured for the benchmark spiro-OMeTAD HTM. The HTM properties have been analyzed by means of photoluminescence and conductivity experiments, which demonstrated a better hole extraction and conductivity for spiro-OMeTAD.
PB Journal of Materials Chemistry C
SN 2050-7526
SN 2050-7534
YR 2019
FD 2019
LK https://hdl.handle.net/20.500.14352/108841
UL https://hdl.handle.net/20.500.14352/108841
LA eng
NO J. Mater. Chem. C, 2019,7, 6656-6663
NO GENERALITAT VALENCIANA
NO H2020 European Research Council
NO European Regional Development Fund
NO European Research Council
NO Comunidad de Madrid
DS Docta Complutense
RD 4 abr 2025