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  4. High-Efficiency Perovskite Solar Cells Using Molecularly Engineered, Thiophene-Rich, Hole-Transporting Materials: Influence of Alkyl Chain Length on Power Conversion Efficiency
 
research article

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

Zimmermann, Iwan  
•
Urieta-Mora, Javier
•
Gratia, Paul  
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2017
Advanced Energy Materials

The synthesis and characterization of a series of novel small-molecule holetransporting 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 are tested in perovskite solar cells and power conversion efficiencies (PCE) of up to 18.1% under 1 sun irradiation are measured. This value is comparable with the 17.8% efficiency obtained using 2,2', 7,7'-tetrakis(N, Ndi- p-methoxyphenylamine)-9,9'-spirobifluorene 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 improves 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.

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Type
research article
DOI
10.1002/aenm.201601674
Web of Science ID

WOS:000397007100019

Author(s)
Zimmermann, Iwan  
Urieta-Mora, Javier
Gratia, Paul  
Arago, Juan
Grancini, Giulia  
Molina-Ontoria, Agustin
Orti, Enrique
Martin, Nazario
Nazeeruddin, Mohammad Khaja
Date Issued

2017

Publisher

Wiley-V C H Verlag Gmbh

Published in
Advanced Energy Materials
Volume

7

Issue

6

Article Number

1601674

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GMF  
Available on Infoscience
May 1, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/136810
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