Comparing the backfilling of mesoporous titania thin films with hole conductors of different sizes sharing the same mass density

Efficient infiltration of a mesoporous titania matrix with conducting organic polymers or small molecules is one key challenge to overcome for hybrid photovoltaic devices. A quantitative analysis of the backfilling efficiency with time-of-flight grazing incidence small-angle neutron scattering (ToF-...

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Bibliographic Details
Published in:IUCrJ 2020-03, Vol.7 (Pt 2), p.268-275
Main Authors: Märkl, Raphael S, Hohn, Nuri, Hupf, Emanuel, Bießmann, Lorenz, Körstgens, Volker, Kreuzer, Lucas P, Mangiapia, Gaetano, Pomm, Matthias, Kriele, Armin, Rivard, Eric, Müller-Buschbaum, Peter
Format: Article
Language:English
Subjects:
Analysis
Backfill
backfilling
Characterization
Conductors
Density
Electron microscopy
grazing incidence small-angle neutron scattering
mesoporous titania
Microscopy
Morphology
Neutron scattering
Photovoltaic cells
Polymer industry
Research Papers
Resveratrol
semiconducting polymers
Solar energy industry
Structural analysis
tellurophene
Thin films
Thiophene
Time
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Summary:Efficient infiltration of a mesoporous titania matrix with conducting organic polymers or small molecules is one key challenge to overcome for hybrid photovoltaic devices. A quantitative analysis of the backfilling efficiency with time-of-flight grazing incidence small-angle neutron scattering (ToF-GISANS) and scanning electron microscopy (SEM) measurements is presented. Differences in the morphology due to the backfilling of mesoporous titania thin films are compared for the macromolecule poly[4,8-bis-(5-(2-ethyl-hexyl)-thio-phen-2-yl)benzo[1,2- ;4,5- ']di-thio-phene-2,6-diyl- -(4-(2-ethyl-hexyl)-3-fluoro-thieno[3,4- ]thio-phene-)-2-carboxyl-ate-2-6-diyl)] (PTB7-Th) and the heavy-element containing small molecule 2-pinacol-boronate-3-phenyl-phen-anthro[9,10- ]telluro-phene (PhenTe-BPinPh). Hence, a 1.7 times higher backfilling efficiency of almost 70% is achieved for the small molecule PhenTe-BPinPh compared with the polymer PTB7-Th despite sharing the same volumetric mass density. The precise characterization of structural changes due to backfilling reveals that the volumetric density of backfilled materials plays a minor role in obtaining good backfilling efficiencies and interfaces with large surface contact.
ISSN:2052-2525
2052-2525
DOI:10.1107/S2052252520000913