In situ morphology studies of the mechanism for solution additive effects on the formation of bulk heterojunction films

Handle URI:
http://hdl.handle.net/10754/563765
Title:
In situ morphology studies of the mechanism for solution additive effects on the formation of bulk heterojunction films
Authors:
Richter, Lee J.; DeLongchamp., Dean M.; Bokel, Felicia A.; Engmann, Sebastian; Chou, Kang Wei; Amassian, Aram ( 0000-0002-5734-1194 ) ; Schaible, Eric G.; Hexemer, Alexander
Abstract:
The most successful active film morphology in organic photovoltaics is the bulk heterojunction (BHJ). The performance of a BHJ arises from a complex interplay of the spatial organization of the segregated donor and acceptor phases and the local order/quality of the respective phases. These critical morphological features develop dynamically during film formation, and it has become common practice to control them by the introduction of processing additives. Here, in situ grazing incidence X-ray diffraction (GIXD) and grazing incidence small angle X-ray scattering (GISAXS) studies of the development of order in BHJ films formed from the donor polymer poly(3-hexylthiophene) and acceptor phenyl-C61-butyric acid methyl ester under the influence of two common additives, 1,8-octanedithiol and 1-chloronaphthalene, are reported. By comparing optical aggregation to crystallization and using GISAXS to determine the number and nature of phases present during drying, two common mechanisms by which the additives increase P3HT crystallinity are identified. Additives accelerate the appearance of pre-crystalline nuclei by controlling solvent quality and allow for extended crystal growth by delaying the onset of PCBM-induced vitrification. The glass transition effects vary system-to-system and may be correlated to the number and composition of phases present during drying. Synchrotron X-ray scattering measurements of nanoscale structure evolution during the drying of polymer-fullerene photovoltaic films are described. Changes in the number and nature of phases, as well as the order within them, reveals the mechanisms by which formulation additives promote structural characteristics leading to higher power conversion efficiencies.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program; Solar and Photovoltaic Engineering Research Center (SPERC); Organic Electronics and Photovoltaics Group
Publisher:
Wiley-Blackwell
Journal:
Advanced Energy Materials
Issue Date:
29-Sep-2014
DOI:
10.1002/aenm.201400975
Type:
Article
ISSN:
16146832
Sponsors:
The authors wish to thank Jacquline Johnson and Edwin Chan for assistance in the development of the remote dispense system. Beamline 7.3.3 of the Advanced Light Source is supported by the Director of the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorRichter, Lee J.en
dc.contributor.authorDeLongchamp., Dean M.en
dc.contributor.authorBokel, Felicia A.en
dc.contributor.authorEngmann, Sebastianen
dc.contributor.authorChou, Kang Weien
dc.contributor.authorAmassian, Aramen
dc.contributor.authorSchaible, Eric G.en
dc.contributor.authorHexemer, Alexanderen
dc.date.accessioned2015-08-03T12:09:23Zen
dc.date.available2015-08-03T12:09:23Zen
dc.date.issued2014-09-29en
dc.identifier.issn16146832en
dc.identifier.doi10.1002/aenm.201400975en
dc.identifier.urihttp://hdl.handle.net/10754/563765en
dc.description.abstractThe most successful active film morphology in organic photovoltaics is the bulk heterojunction (BHJ). The performance of a BHJ arises from a complex interplay of the spatial organization of the segregated donor and acceptor phases and the local order/quality of the respective phases. These critical morphological features develop dynamically during film formation, and it has become common practice to control them by the introduction of processing additives. Here, in situ grazing incidence X-ray diffraction (GIXD) and grazing incidence small angle X-ray scattering (GISAXS) studies of the development of order in BHJ films formed from the donor polymer poly(3-hexylthiophene) and acceptor phenyl-C61-butyric acid methyl ester under the influence of two common additives, 1,8-octanedithiol and 1-chloronaphthalene, are reported. By comparing optical aggregation to crystallization and using GISAXS to determine the number and nature of phases present during drying, two common mechanisms by which the additives increase P3HT crystallinity are identified. Additives accelerate the appearance of pre-crystalline nuclei by controlling solvent quality and allow for extended crystal growth by delaying the onset of PCBM-induced vitrification. The glass transition effects vary system-to-system and may be correlated to the number and composition of phases present during drying. Synchrotron X-ray scattering measurements of nanoscale structure evolution during the drying of polymer-fullerene photovoltaic films are described. Changes in the number and nature of phases, as well as the order within them, reveals the mechanisms by which formulation additives promote structural characteristics leading to higher power conversion efficiencies.en
dc.description.sponsorshipThe authors wish to thank Jacquline Johnson and Edwin Chan for assistance in the development of the remote dispense system. Beamline 7.3.3 of the Advanced Light Source is supported by the Director of the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.en
dc.publisherWiley-Blackwellen
dc.subjectmorphologyen
dc.subjectorganic electronicsen
dc.subjectorganic photovoltaicsen
dc.subjectphase transitionsen
dc.titleIn situ morphology studies of the mechanism for solution additive effects on the formation of bulk heterojunction filmsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.contributor.departmentOrganic Electronics and Photovoltaics Groupen
dc.identifier.journalAdvanced Energy Materialsen
dc.contributor.institutionMaterial Measurement Laboratory, National Institute of Standards and TechnologyGaithersburg, MD, United Statesen
dc.contributor.institutionAdvanced Light Source, Lawrence Berkeley National LaboratoryBerkeley, CA, United Statesen
kaust.authorChou, Kang Weien
kaust.authorAmassian, Aramen
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