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Comparing the backfilling of mesoporous titania thin films with hole conductors of different sizes sharing the same mass density
- Source :
- IUCrJ, IUCrJ, Vol 7, Iss 2, Pp 268-275 (2020), Märkl, R.; Hohn, N.; Hupf, E.; Bießmann, L.; Körstgens, V.; Kreuzer, L.; Mangiapia, G.; Pomm, M.; Kriele, A.; Rivard, E.; Müller-Buschbaum, P.; : Comparing the backfilling of mesoporous titania thin films with hole conductors of different sizes sharing the same mass density. In: IUCrJ. Vol. 7 (2020) 2, 268-275. (DOI: /10.1107/S2052252520000913) (ISBN: 2052-2525)
- Publication Year :
- 2020
- Publisher :
- International Union of Crystallography, 2020.
-
Abstract
- Mesoporous titania thin films backfilled with the conjugated polymer PTB7-Th or the small-molecule PhenTe-BPinPh have been studied as novel materials for hybrid photovoltaics. Together with observed structural changes due to backfilling, volumetric mass density can be excluded in determining factors that influence backfilling efficiency for solar cell applications.<br />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-ethyl­hexyl)­thio­phen-2-yl)benzo[1,2-b;4,5-b′]di­thio­phene-2,6-diyl-alt-(4-(2-ethyl­hexyl)-3-fluoro­thieno[3,4-b]thio­phene-)-2-carboxyl­ate-2-6-diyl)] (PTB7-Th) and the heavy-element containing small molecule 2-pinacol­boronate-3-phenyl­phen­anthro[9,10-b]telluro­phene (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.
- Subjects :
- Materials science
Scanning electron microscope
02 engineering and technology
Neutron scattering
010402 general chemistry
01 natural sciences
Biochemistry
grazing incidence small-angle neutron scattering
General Materials Science
Thin film
education
lcsh:Science
Electrical conductor
chemistry.chemical_classification
education.field_of_study
semiconducting polymers
General Chemistry
Polymer
Volumetric Mass Density
021001 nanoscience & nanotechnology
Condensed Matter Physics
Research Papers
ddc
0104 chemical sciences
Characterization (materials science)
chemistry
Chemical engineering
backfilling
tellurophene
lcsh:Q
0210 nano-technology
mesoporous titania
Macromolecule
Subjects
Details
- Language :
- English
- ISSN :
- 20522525
- Volume :
- 7
- Issue :
- Pt 2
- Database :
- OpenAIRE
- Journal :
- IUCrJ
- Accession number :
- edsair.doi.dedup.....41b820af049de2ff235f63d083b638db