Sequentially solution-processed, nanostructured polymer photovoltaics using selective solvents

Handle URI:
http://hdl.handle.net/10754/599603
Title:
Sequentially solution-processed, nanostructured polymer photovoltaics using selective solvents
Authors:
Kim, Do Hwan; Mei, Jianguo; Ayzner, Alexander L.; Schmidt, Kristin; Giri, Gaurav; Appleton, Anthony L.; Toney, Michael F.; Bao, Zhenan
Abstract:
We demonstrate high-performance sequentially solution-processed organic photovoltaics (OPVs) with a power conversion efficiency (PCE) of 5% for blend films using a donor polymer based on the isoindigo-bithiophene repeat unit (PII2T-C10C8) and a fullerene derivative [6,6]-phenyl-C[71]-butyric acid methyl ester (PC71BM). This has been accomplished by systematically controlling the swelling and intermixing processes of the layer with various processing solvents during deposition of the fullerene. We find that among the solvents used for fullerene deposition that primarily swell but do not re-dissolve the polymer underlayer, there were significant microstructural differences between chloro and o-dichlorobenzene solvents (CB and ODCB, respectively). Specifically, we show that the polymer crystallite orientation distribution in films where ODCB was used to cast the fullerene is broad. This indicates that out-of-plane charge transport through a tortuous transport network is relatively efficient due to a large density of inter-grain connections. In contrast, using CB results in primarily edge-on oriented polymer crystallites, which leads to diminished out-of-plane charge transport. We correlate these microstructural differences with photocurrent measurements, which clearly show that casting the fullerene out of ODCB leads to significantly enhanced power conversion efficiencies. Thus, we believe that tuning the processing solvents used to cast the electron acceptor in sequentially-processed devices is a viable way to controllably tune the blend film microstructure. © 2014 The Royal Society of Chemistry.
Citation:
Kim DH, Mei J, Ayzner AL, Schmidt K, Giri G, et al. (2014) Sequentially solution-processed, nanostructured polymer photovoltaics using selective solvents. Energy Environ Sci 7: 1103. Available: http://dx.doi.org/10.1039/c3ee43541e.
Publisher:
Royal Society of Chemistry (RSC)
Journal:
Energy & Environmental Science
KAUST Grant Number:
KUS-C1-015-21
Issue Date:
2014
DOI:
10.1039/c3ee43541e
Type:
Article
ISSN:
1754-5692; 1754-5706
Sponsors:
This work was partially supported by the Center for Advanced Molecular Photovoltaics, award no. KUS-C1-015-21, made by King Abdullah University of Science and Technology and the Department of Energy, Laboratory Directed Research and Development funding, under contract DE-AC02-76SF00515 (M.F.T. and K.S.). We also acknowledge support from the Global Climate and Energy Program at Stanford and the Camille and Henry Dreyfus Postdoctoral Program in Environmental Chemistry (J.M. and A.L.A). D.H.K acknowledges financial support by a grant (Code No. 2011-0031628) from the Center for Advanced Soft Electronics under the Global Frontier Research Program of the Ministry of Science, ICT and Future Planning, Korea. GIXD measurements were carried out at the Stanford Synchrotron Radiation Laboratory, a national user facility operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorKim, Do Hwanen
dc.contributor.authorMei, Jianguoen
dc.contributor.authorAyzner, Alexander L.en
dc.contributor.authorSchmidt, Kristinen
dc.contributor.authorGiri, Gauraven
dc.contributor.authorAppleton, Anthony L.en
dc.contributor.authorToney, Michael F.en
dc.contributor.authorBao, Zhenanen
dc.date.accessioned2016-02-28T05:54:08Zen
dc.date.available2016-02-28T05:54:08Zen
dc.date.issued2014en
dc.identifier.citationKim DH, Mei J, Ayzner AL, Schmidt K, Giri G, et al. (2014) Sequentially solution-processed, nanostructured polymer photovoltaics using selective solvents. Energy Environ Sci 7: 1103. Available: http://dx.doi.org/10.1039/c3ee43541e.en
dc.identifier.issn1754-5692en
dc.identifier.issn1754-5706en
dc.identifier.doi10.1039/c3ee43541een
dc.identifier.urihttp://hdl.handle.net/10754/599603en
dc.description.abstractWe demonstrate high-performance sequentially solution-processed organic photovoltaics (OPVs) with a power conversion efficiency (PCE) of 5% for blend films using a donor polymer based on the isoindigo-bithiophene repeat unit (PII2T-C10C8) and a fullerene derivative [6,6]-phenyl-C[71]-butyric acid methyl ester (PC71BM). This has been accomplished by systematically controlling the swelling and intermixing processes of the layer with various processing solvents during deposition of the fullerene. We find that among the solvents used for fullerene deposition that primarily swell but do not re-dissolve the polymer underlayer, there were significant microstructural differences between chloro and o-dichlorobenzene solvents (CB and ODCB, respectively). Specifically, we show that the polymer crystallite orientation distribution in films where ODCB was used to cast the fullerene is broad. This indicates that out-of-plane charge transport through a tortuous transport network is relatively efficient due to a large density of inter-grain connections. In contrast, using CB results in primarily edge-on oriented polymer crystallites, which leads to diminished out-of-plane charge transport. We correlate these microstructural differences with photocurrent measurements, which clearly show that casting the fullerene out of ODCB leads to significantly enhanced power conversion efficiencies. Thus, we believe that tuning the processing solvents used to cast the electron acceptor in sequentially-processed devices is a viable way to controllably tune the blend film microstructure. © 2014 The Royal Society of Chemistry.en
dc.description.sponsorshipThis work was partially supported by the Center for Advanced Molecular Photovoltaics, award no. KUS-C1-015-21, made by King Abdullah University of Science and Technology and the Department of Energy, Laboratory Directed Research and Development funding, under contract DE-AC02-76SF00515 (M.F.T. and K.S.). We also acknowledge support from the Global Climate and Energy Program at Stanford and the Camille and Henry Dreyfus Postdoctoral Program in Environmental Chemistry (J.M. and A.L.A). D.H.K acknowledges financial support by a grant (Code No. 2011-0031628) from the Center for Advanced Soft Electronics under the Global Frontier Research Program of the Ministry of Science, ICT and Future Planning, Korea. GIXD measurements were carried out at the Stanford Synchrotron Radiation Laboratory, a national user facility operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences.en
dc.publisherRoyal Society of Chemistry (RSC)en
dc.titleSequentially solution-processed, nanostructured polymer photovoltaics using selective solventsen
dc.typeArticleen
dc.identifier.journalEnergy & Environmental Scienceen
dc.contributor.institutionStanford University, Palo Alto, United Statesen
dc.contributor.institutionStanford Synchrotron Radiation Laboratory, Menlo Park, United Statesen
dc.contributor.institutionSoongsil University, Seoul, South Koreaen
kaust.grant.numberKUS-C1-015-21en
kaust.grant.fundedcenterCenter for Advanced Molecular Photovoltaics (CAMP)en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.