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High-Efficiency Perovskite Solar Cells using Molecularly-Engineered, Thiophene-Rich,Hole-Transporting Materials: Influence of Alkyl Chain Length on Power Conversion Efficiency

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Zimmermann, Iwan and Urieta Mora, Javier and Gratia, Paul and Aragó, Juan and Grancini, Giulia and Molina-Ontoria, Agustín and Ortí, Enrique and Martín, Nazario and Khaja Nazeeruddin, Mohammad (2016) High-Efficiency Perovskite Solar Cells using Molecularly-Engineered, Thiophene-Rich,Hole-Transporting Materials: Influence of Alkyl Chain Length on Power Conversion Efficiency. Advanced energy materials . ISSN 1614-6840 (Online) 1614-6832 (Print)

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/aenm.201601674/epdf



Abstract

The synthesis and characterization of a series of novel small-molecule hole-transporting materials (HTMs) based on an anthra[1,2-b:4,3-b′:5,6-b′′:8,7-b′′′]tetrathiophene (ATT) core are reported. The new compounds follow an easy synthetic route and have no need of expensive purification steps. The novel HTMs were tested in perovskite solar cells (PSCs) and power conversion efficiencies (PCE) of up to 18.1 % under 1 sun irradiation were 2 measured. This value is comparable with the 17.8 % efficiency obtained using spiroOMeTAD as a reference compound. Similarly, a significant quenching of the Photoluminescence in the first nanosecond is observed, indicative of effective hole transfer.Additionally, the influence of introducing aliphatic alkyl chains acting as solubilizers on the device performance of the ATT molecules is investigated. Replacing the methoxy groups on the triarylamine sites by butoxy-, hexoxy- or decoxy-substituents greatly improved the solubility of the compounds without changing the energy levels, yet at the same time significantly decreasing the conductivity as well as the PCE, 17.3 % for ATT-OBu, 15.7 % for ATT-OHex and 9.7 % for ATT-ODec.


Item Type:Article
Uncontrolled Keywords:Hole-transporting materials, perovskite solar cells, anthratetrathiophenes, alkyl chains, hole transfer dynamics
Subjects:Sciences > Chemistry > Chemistry, Organic
ID Code:41604
Deposited On:02 Mar 2017 12:16
Last Modified:21 Nov 2017 00:01

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