Morphology-Dependent Trap Formation in High Performance Polymer Bulk Heterojunction Solar Cells

Handle URI:
http://hdl.handle.net/10754/598893
Title:
Morphology-Dependent Trap Formation in High Performance Polymer Bulk Heterojunction Solar Cells
Authors:
Beiley, Zach M.; Hoke, Eric T.; Noriega, Rodrigo; Dacuña, Javier; Burkhard, George F.; Bartelt, Jonathan A.; Salleo, Alberto; Toney, Michael F.; McGehee, Michael D.
Abstract:
Bulk heterojunction solar cells (BHJs) based on poly[N-9″-hepta- decanyl-2,7-carbazole- alt -5,5-(4′,7′-di-2-thienyl-2′, 1′,3′-benzothiadiazole)] (PCDTBT) can have internal quantum efficiencies approaching 100% but require active layers that are too thin to absorb more than ∼70% of the above band gap light. When the active layer thickness is increased so that the cell absorbs more light, the fi ll factor and open circuit voltage decrease rapidly, so that the overall power conversion efficiency decreases. We fi nd that hole-traps in the polymer, which we characterize using space-charge limited current measurements, play an important role in the performance of PCDTBT-based BHJs and may limit the active layer thickness. Recombination due to carrier trapping is not often considered in BHJs because it is not believed to be a dominant loss mechanism in the "fruit-fl y" P3HT system. Furthermore, we show that in contrast to P3HT, PCDTBT has only weak short-range molecular order, and that annealing at temperatures above the glass transition decreases the order in the π-π stacking. The decrease in structural order is matched by the movement of hole-traps deeper into the band gap, so that thermal annealing worsens hole transport in the polymer and reduces the efficiency of PCDTBTbased BHJs. These fi ndings suggest that P3HT is not prototypical of the new class of high efficiency polymers, and that further improvement of BHJ efficiencies will necessitate the study of high efficiency polymers with low structural order. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Citation:
Beiley ZM, Hoke ET, Noriega R, Dacuña J, Burkhard GF, et al. (2011) Morphology-Dependent Trap Formation in High Performance Polymer Bulk Heterojunction Solar Cells. Adv Energy Mater 1: 954–962. Available: http://dx.doi.org/10.1002/aenm.201100204.
Publisher:
Wiley-Blackwell
Journal:
Advanced Energy Materials
KAUST Grant Number:
KUS-C1-015-21
Issue Date:
28-Jun-2011
DOI:
10.1002/aenm.201100204
Type:
Article
ISSN:
1614-6832
Sponsors:
The authors would like to thank Dr. Suzana Nunes for her helpful discussions of polymer morphology. PCDTBT was provided by St. Jean Photochemicals and CA-1914 by Plextronics. This work was supported by the Center for Advanced Molecular Photovoltaics (CAMP) (Award No KUS-C1-015-21) made by the King Abdullah University of Science and Technology (KAUST). Additional funding was provided by the National Defense Science and Engineering Graduate (NDSEG) Fellowship (Z.M.B.) and the Fannie and John Hertz Foundation (E.T.H.). 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.
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Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorBeiley, Zach M.en
dc.contributor.authorHoke, Eric T.en
dc.contributor.authorNoriega, Rodrigoen
dc.contributor.authorDacuña, Javieren
dc.contributor.authorBurkhard, George F.en
dc.contributor.authorBartelt, Jonathan A.en
dc.contributor.authorSalleo, Albertoen
dc.contributor.authorToney, Michael F.en
dc.contributor.authorMcGehee, Michael D.en
dc.date.accessioned2016-02-25T13:43:13Zen
dc.date.available2016-02-25T13:43:13Zen
dc.date.issued2011-06-28en
dc.identifier.citationBeiley ZM, Hoke ET, Noriega R, Dacuña J, Burkhard GF, et al. (2011) Morphology-Dependent Trap Formation in High Performance Polymer Bulk Heterojunction Solar Cells. Adv Energy Mater 1: 954–962. Available: http://dx.doi.org/10.1002/aenm.201100204.en
dc.identifier.issn1614-6832en
dc.identifier.doi10.1002/aenm.201100204en
dc.identifier.urihttp://hdl.handle.net/10754/598893en
dc.description.abstractBulk heterojunction solar cells (BHJs) based on poly[N-9″-hepta- decanyl-2,7-carbazole- alt -5,5-(4′,7′-di-2-thienyl-2′, 1′,3′-benzothiadiazole)] (PCDTBT) can have internal quantum efficiencies approaching 100% but require active layers that are too thin to absorb more than ∼70% of the above band gap light. When the active layer thickness is increased so that the cell absorbs more light, the fi ll factor and open circuit voltage decrease rapidly, so that the overall power conversion efficiency decreases. We fi nd that hole-traps in the polymer, which we characterize using space-charge limited current measurements, play an important role in the performance of PCDTBT-based BHJs and may limit the active layer thickness. Recombination due to carrier trapping is not often considered in BHJs because it is not believed to be a dominant loss mechanism in the "fruit-fl y" P3HT system. Furthermore, we show that in contrast to P3HT, PCDTBT has only weak short-range molecular order, and that annealing at temperatures above the glass transition decreases the order in the π-π stacking. The decrease in structural order is matched by the movement of hole-traps deeper into the band gap, so that thermal annealing worsens hole transport in the polymer and reduces the efficiency of PCDTBTbased BHJs. These fi ndings suggest that P3HT is not prototypical of the new class of high efficiency polymers, and that further improvement of BHJ efficiencies will necessitate the study of high efficiency polymers with low structural order. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.en
dc.description.sponsorshipThe authors would like to thank Dr. Suzana Nunes for her helpful discussions of polymer morphology. PCDTBT was provided by St. Jean Photochemicals and CA-1914 by Plextronics. This work was supported by the Center for Advanced Molecular Photovoltaics (CAMP) (Award No KUS-C1-015-21) made by the King Abdullah University of Science and Technology (KAUST). Additional funding was provided by the National Defense Science and Engineering Graduate (NDSEG) Fellowship (Z.M.B.) and the Fannie and John Hertz Foundation (E.T.H.). 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.en
dc.publisherWiley-Blackwellen
dc.titleMorphology-Dependent Trap Formation in High Performance Polymer Bulk Heterojunction Solar Cellsen
dc.typeArticleen
dc.identifier.journalAdvanced Energy Materialsen
dc.contributor.institutionStanford University, Palo Alto, United Statesen
dc.contributor.institutionStanford Synchrotron Radiation Laboratory, Menlo Park, United Statesen
kaust.grant.numberKUS-C1-015-21en
kaust.grant.fundedcenterCenter for Advanced Molecular Photovoltaics (CAMP)en
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