Ring substituents mediate the morphology of PBDTTPD-PCBM bulk-heterojunction solar cells

Handle URI:
http://hdl.handle.net/10754/563493
Title:
Ring substituents mediate the morphology of PBDTTPD-PCBM bulk-heterojunction solar cells
Authors:
Warnan, Julien; El Labban, Abdulrahman ( 0000-0001-9891-0851 ) ; Cabanetos, Clement; Hoke, Eric T.; Shukla, Pradeep Kumar; Risko, Chad; Brédas, Jean Luc; McGehee, Michael D.; Beaujuge, Pierre
Abstract:
Among π-conjugated polymer donors for efficient bulk-heterojunction (BHJ) solar cell applications, poly(benzo[1,2-b:4,5-b′]dithiophene- thieno[3,4-c]pyrrole-4,6-dione) (PBDTTPD) polymers yield some of the highest open-circuit voltages (VOC, ca. 0.9 V) and fill-factors (FF, ca. 70%) in conventional (single-cell) BHJ devices with PCBM acceptors. In PBDTTPD, side chains of varying size and branching affect polymer self-assembly, nanostructural order, and impact material performance. However, the role of the polymer side-chain pattern in the intimate mixing between polymer donors and PCBM acceptors, and on the development of the BHJ morphology is in general less understood. In this contribution, we show that ring substituents such as furan (F), thiophene (T) and selenophene (S)-incorporated into the side chains of PBDTTPD polymers-can induce significant and, of importance, very different morphological effects in BHJs with PCBM. A combination of experimental and theoretical (via density functional theory) characterizations sheds light on how varying the heteroatom of the ring substituents impacts (i) the preferred side-chain configurations and (ii) the ionization, electronic, and optical properties of the PBDTTPD polymers. In parallel, we find that the PBDT(X)TPD analogs (with X = F, T, or S) span a broad range of power conversion efficiencies (PCEs, 3-6.5%) in optimized devices with improved thin-film morphologies via the use of 1,8-diiodooctane (DIO), and discuss that persistent morphological impediments at the nanoscale can be at the origin of the spread in PCE across optimized PBDT(X)TPD-based devices. With their high VOC ∼1 V, PBDT(X)TPD polymers are promising candidates for use in the high-band gap cell of tandem solar cells. © 2014 American Chemical Society.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center (SPERC); Chemical Science Program
Publisher:
American Chemical Society (ACS)
Journal:
Chemistry of Materials
Issue Date:
8-Apr-2014
DOI:
10.1021/cm500172w
Type:
Article
ISSN:
08974756
Sponsors:
The authors acknowledge financial support under Baseline Research Funding from King Abdullah University of Science and Technology (KAUST). E.H., CR., J.L.B., and M.D.M.c.G. acknowledge financial support by the Center for Advanced Molecular Photovoltaics (CAMP) (Award KUS-C1-015-21) made possible by KAUST. The authors thank KAUST Analytical Core Laboratories for mass spectrometry, SEC measurements and elemental analyses, and Sandra Seywald (MPIP-Mainz, Germany) for additional SEC measurements. The authors thank the Advanced Imaging and Characterization Laboratories at KAUST for technical support. Portions of this research were carried out at the Stanford Synchrotron Radiation Lightsource user facility, operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences. P.K.S. is grateful to the University Grants Commission, New Delhi, India for a research fellowship.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorWarnan, Julienen
dc.contributor.authorEl Labban, Abdulrahmanen
dc.contributor.authorCabanetos, Clementen
dc.contributor.authorHoke, Eric T.en
dc.contributor.authorShukla, Pradeep Kumaren
dc.contributor.authorRisko, Chaden
dc.contributor.authorBrédas, Jean Lucen
dc.contributor.authorMcGehee, Michael D.en
dc.contributor.authorBeaujuge, Pierreen
dc.date.accessioned2015-08-03T11:52:49Zen
dc.date.available2015-08-03T11:52:49Zen
dc.date.issued2014-04-08en
dc.identifier.issn08974756en
dc.identifier.doi10.1021/cm500172wen
dc.identifier.urihttp://hdl.handle.net/10754/563493en
dc.description.abstractAmong π-conjugated polymer donors for efficient bulk-heterojunction (BHJ) solar cell applications, poly(benzo[1,2-b:4,5-b′]dithiophene- thieno[3,4-c]pyrrole-4,6-dione) (PBDTTPD) polymers yield some of the highest open-circuit voltages (VOC, ca. 0.9 V) and fill-factors (FF, ca. 70%) in conventional (single-cell) BHJ devices with PCBM acceptors. In PBDTTPD, side chains of varying size and branching affect polymer self-assembly, nanostructural order, and impact material performance. However, the role of the polymer side-chain pattern in the intimate mixing between polymer donors and PCBM acceptors, and on the development of the BHJ morphology is in general less understood. In this contribution, we show that ring substituents such as furan (F), thiophene (T) and selenophene (S)-incorporated into the side chains of PBDTTPD polymers-can induce significant and, of importance, very different morphological effects in BHJs with PCBM. A combination of experimental and theoretical (via density functional theory) characterizations sheds light on how varying the heteroatom of the ring substituents impacts (i) the preferred side-chain configurations and (ii) the ionization, electronic, and optical properties of the PBDTTPD polymers. In parallel, we find that the PBDT(X)TPD analogs (with X = F, T, or S) span a broad range of power conversion efficiencies (PCEs, 3-6.5%) in optimized devices with improved thin-film morphologies via the use of 1,8-diiodooctane (DIO), and discuss that persistent morphological impediments at the nanoscale can be at the origin of the spread in PCE across optimized PBDT(X)TPD-based devices. With their high VOC ∼1 V, PBDT(X)TPD polymers are promising candidates for use in the high-band gap cell of tandem solar cells. © 2014 American Chemical Society.en
dc.description.sponsorshipThe authors acknowledge financial support under Baseline Research Funding from King Abdullah University of Science and Technology (KAUST). E.H., CR., J.L.B., and M.D.M.c.G. acknowledge financial support by the Center for Advanced Molecular Photovoltaics (CAMP) (Award KUS-C1-015-21) made possible by KAUST. The authors thank KAUST Analytical Core Laboratories for mass spectrometry, SEC measurements and elemental analyses, and Sandra Seywald (MPIP-Mainz, Germany) for additional SEC measurements. The authors thank the Advanced Imaging and Characterization Laboratories at KAUST for technical support. Portions of this research were carried out at the Stanford Synchrotron Radiation Lightsource user facility, operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences. P.K.S. is grateful to the University Grants Commission, New Delhi, India for a research fellowship.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleRing substituents mediate the morphology of PBDTTPD-PCBM bulk-heterojunction solar cellsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.contributor.departmentChemical Science Programen
dc.identifier.journalChemistry of Materialsen
dc.contributor.institutionDepartment of Materials Science and Engineering, Stanford University, Stanford, CA 94305, United Statesen
dc.contributor.institutionSchool of Chemistry and Biochemistry, Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, GA 30332-0400, United Statesen
dc.contributor.institutionDepartment of Physics, Assam University, Silchar 788011, Indiaen
kaust.authorWarnan, Julienen
kaust.authorEl Labban, Abdulrahmanen
kaust.authorCabanetos, Clementen
kaust.authorBeaujuge, Pierreen
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