Polymer:Nonfullerene Bulk Heterojunction Solar Cells with Exceptionally Low Recombination Rates

Handle URI:
http://hdl.handle.net/10754/625754
Title:
Polymer:Nonfullerene Bulk Heterojunction Solar Cells with Exceptionally Low Recombination Rates
Authors:
Gasparini, Nicola ( 0000-0002-3226-8234 ) ; Salvador, Michael; Heumueller, Thomas; Richter, Moses; Classen, Andrej; Shrestha, Shreetu; Matt, Gebhard J.; Holliday, Sarah; Strohm, Sebastian; Egelhaaf, Hans-Joachim; Wadsworth, Andrew; Baran, Derya ( 0000-0003-2196-8187 ) ; McCulloch, Iain ( 0000-0002-6340-7217 ) ; Brabec, Christoph J.
Abstract:
Organic semiconductors are in general known to have an inherently lower charge carrier mobility compared to their inorganic counterparts. Bimolecular recombination of holes and electrons is an important loss mechanism and can often be described by the Langevin recombination model. Here, the device physics of bulk heterojunction solar cells based on a nonfullerene acceptor (IDTBR) in combination with poly(3-hexylthiophene) (P3HT) are elucidated, showing an unprecedentedly low bimolecular recombination rate. The high fill factor observed (above 65%) is attributed to non-Langevin behavior with a Langevin prefactor (β/βL) of 1.9 × 10−4. The absence of parasitic recombination and high charge carrier lifetimes in P3HT:IDTBR solar cells inform an almost ideal bimolecular recombination behavior. This exceptional recombination behavior is explored to fabricate devices with layer thicknesses up to 450 nm without significant performance losses. The determination of the photoexcited carrier mobility by time-of-flight measurements reveals a long-lived and nonthermalized carrier transport as the origin for the exceptional transport physics. The crystalline microstructure arrangement of both components is suggested to be decisive for this slow recombination dynamics. Further, the thickness-independent power conversion efficiency is of utmost technological relevance for upscaling production and reiterates the importance of understanding material design in the context of low bimolecular recombination.
KAUST Department:
KAUST Solar Center (KSC)
Citation:
Gasparini N, Salvador M, Heumueller T, Richter M, Classen A, et al. (2017) Polymer:Nonfullerene Bulk Heterojunction Solar Cells with Exceptionally Low Recombination Rates. Advanced Energy Materials: 1701561. Available: http://dx.doi.org/10.1002/aenm.201701561.
Publisher:
Wiley-Blackwell
Journal:
Advanced Energy Materials
Issue Date:
1-Sep-2017
DOI:
10.1002/aenm.201701561
Type:
Article
ISSN:
1614-6832
Sponsors:
This project received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 607585 project OSNIRO. M.S. acknowledges primary support from a fellowship by the Portuguese Fundação para a Ciência e a Tecnologia (SFRH/BPD/71816/2010). The authors gratefully acknowledge the support of the Cluster of Excellence “Engineering of Advanced Materials” at the University of Erlangen-Nuremberg, which was funded by the German Research Foundation (DFG) within the framework of its “Excellence Initiative,” Synthetic Carbon Allotropes (SFB953), Research Training Group (GRK 1896), and Solar Technologies go Hybrid (SolTech).
Additional Links:
http://onlinelibrary.wiley.com/doi/10.1002/aenm.201701561/full
Appears in Collections:
Articles; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorGasparini, Nicolaen
dc.contributor.authorSalvador, Michaelen
dc.contributor.authorHeumueller, Thomasen
dc.contributor.authorRichter, Mosesen
dc.contributor.authorClassen, Andrejen
dc.contributor.authorShrestha, Shreetuen
dc.contributor.authorMatt, Gebhard J.en
dc.contributor.authorHolliday, Sarahen
dc.contributor.authorStrohm, Sebastianen
dc.contributor.authorEgelhaaf, Hans-Joachimen
dc.contributor.authorWadsworth, Andrewen
dc.contributor.authorBaran, Deryaen
dc.contributor.authorMcCulloch, Iainen
dc.contributor.authorBrabec, Christoph J.en
dc.date.accessioned2017-10-03T12:49:37Z-
dc.date.available2017-10-03T12:49:37Z-
dc.date.issued2017-09-01en
dc.identifier.citationGasparini N, Salvador M, Heumueller T, Richter M, Classen A, et al. (2017) Polymer:Nonfullerene Bulk Heterojunction Solar Cells with Exceptionally Low Recombination Rates. Advanced Energy Materials: 1701561. Available: http://dx.doi.org/10.1002/aenm.201701561.en
dc.identifier.issn1614-6832en
dc.identifier.doi10.1002/aenm.201701561en
dc.identifier.urihttp://hdl.handle.net/10754/625754-
dc.description.abstractOrganic semiconductors are in general known to have an inherently lower charge carrier mobility compared to their inorganic counterparts. Bimolecular recombination of holes and electrons is an important loss mechanism and can often be described by the Langevin recombination model. Here, the device physics of bulk heterojunction solar cells based on a nonfullerene acceptor (IDTBR) in combination with poly(3-hexylthiophene) (P3HT) are elucidated, showing an unprecedentedly low bimolecular recombination rate. The high fill factor observed (above 65%) is attributed to non-Langevin behavior with a Langevin prefactor (β/βL) of 1.9 × 10−4. The absence of parasitic recombination and high charge carrier lifetimes in P3HT:IDTBR solar cells inform an almost ideal bimolecular recombination behavior. This exceptional recombination behavior is explored to fabricate devices with layer thicknesses up to 450 nm without significant performance losses. The determination of the photoexcited carrier mobility by time-of-flight measurements reveals a long-lived and nonthermalized carrier transport as the origin for the exceptional transport physics. The crystalline microstructure arrangement of both components is suggested to be decisive for this slow recombination dynamics. Further, the thickness-independent power conversion efficiency is of utmost technological relevance for upscaling production and reiterates the importance of understanding material design in the context of low bimolecular recombination.en
dc.description.sponsorshipThis project received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 607585 project OSNIRO. M.S. acknowledges primary support from a fellowship by the Portuguese Fundação para a Ciência e a Tecnologia (SFRH/BPD/71816/2010). The authors gratefully acknowledge the support of the Cluster of Excellence “Engineering of Advanced Materials” at the University of Erlangen-Nuremberg, which was funded by the German Research Foundation (DFG) within the framework of its “Excellence Initiative,” Synthetic Carbon Allotropes (SFB953), Research Training Group (GRK 1896), and Solar Technologies go Hybrid (SolTech).en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1002/aenm.201701561/fullen
dc.subjectCharge recombinationen
dc.subjectCharge transporten
dc.subjectLangevinen
dc.subjectNonfullerene acceptoren
dc.subjectOrganic photovoltaic devicesen
dc.titlePolymer:Nonfullerene Bulk Heterojunction Solar Cells with Exceptionally Low Recombination Ratesen
dc.typeArticleen
dc.contributor.departmentKAUST Solar Center (KSC)en
dc.identifier.journalAdvanced Energy Materialsen
dc.contributor.institutionInstitute of Materials for Electronics and Energy Technology (I-MEET); Friedrich-Alexander-University Erlangen-Nuremberg; Martensstraße 7 91058 Erlangen Germanyen
dc.contributor.institutionInstituto de Telecomunicações; Instituto Superior Técnico; Av. Rovisco Pais P-1049-001 Lisboa Portugalen
dc.contributor.institutionDepartment of Chemistry and Centre for Plastic Electronics; Imperial College London; London SW7 2AZ UKen
dc.contributor.institutionBavarian Center for Applied Energy Research (ZAE Bayern); Haberstrasse 2a 91058 Erlangen Germanyen
kaust.authorBaran, Deryaen
kaust.authorMcCulloch, Iainen
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