Heteroatom Effect on Star-Shaped Hole-Transporting Materials for Perovskite Solar Cells

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(P...

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Bibliographic Details
Authors: 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
Format: article
Publication Date:2018
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/108439
Online Access:https://hdl.handle.net/20.500.14352/108439
Access Level:Open access
Keyword:547
Benzotriselenophene
Heteroatom effect
Hole transporting materials
Perovskite, solar cells
Química orgánica (Química)
2306 Química Orgánica
Description
Summary: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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