Molecular weight dependent vertical composition profiles of PCDTBT: PC71BM blends for organic photovoltaics

被引：61

作者：

Kingsley, James W. ^{[1
]}

Marchisio, Pier Paolo ^{[1
]}

Yi, Hunan ^{[2
]}

Iraqi, Ahmed ^{[2
]}

Kinane, Christy J. ^{[3
]}

Langridge, Sean ^{[3
]}

Thompson, Richard L. ^{[4
]}

Cadby, Ashley J. ^{[5
]}

Pearson, Andrew J. ^{[5
]}

Lidzey, David G. ^{[5
]}

Jones, Richard A. L. ^{[5
]}

Parnell, Andrew J. ^{[5
]}

机构：

[1] Ossila Ltd, Kroto Innovat Ctr, Sheffield S3 7HQ, S Yorkshire, England

[2] Univ Sheffield, Dept Chem, Sheffield S3 7HF, S Yorkshire, England

[3] Rutherford Appleton Lab, Sci & Technol Facil Council, ISIS Pulsed Neutron & Muon Source, Didcot OX11 0QX, Oxon, England

[4] Univ Durham, Dept Chem, Durham DH1 3LE, England

[5] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

来源：

SCIENTIFIC REPORTS | 2014年 / 4卷

基金：

英国工程与自然科学研究理事会;

关键词：

COPOLYMER SOLAR-CELLS; PHASE-SEPARATION; HIGH-PERFORMANCE; POLYMER; MORPHOLOGY; CATHODE; SURFACE; POLY(3-HEXYLTHIOPHENE); EFFICIENCY; FILMS;

D O I：

10.1038/srep05286

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We have used Soxhlet solvent purification to fractionate a broad molecular weight distribution of the polycarbazole polymer PCDTBT into three lower polydispersity molecular weight fractions. Organic photovoltaic devices were made using a blend of the fullerene acceptor PC71BM with the molecular weight fractions. An average power conversion efficiency of 5.89% (peak efficiency of 6.15%) was measured for PCDTBT blend devices with a number average molecular weight of M-n = 25.5 kDa. There was significant variation between the molecular weight fractions with low (M-n = 15.0 kDa) and high (M-n = 34.9 kDa) fractions producing devices with average efficiencies of 5.02% and 3.70% respectively. Neutron reflectivity measurements on these polymer: PC71BM blend layers showed that larger molecular weights leads to an increase in the polymer enrichment layer thickness at the anode interface, this improves efficiency up to a limiting point where the polymer solubility causes a reduction of the PCDTBT concentration in the active layer.

引用

页数：7

共 41 条

[1] The effect of poly(3-hexylthiophene) molecular weight on charge transport and the performance of polymer:fullerene solar cells [J].

Ballantyne, Amy M. ;

Chen, Lichun ;

Dane, Justin ;

Hammant, Thomas ;

Braun, Felix M. ;

Heeney, Martin ;

Duffy, Warren ;

McCulloch, Iain ;

Bradley, Donal D. C. ;

Nelson, Jenny .

ADVANCED FUNCTIONAL MATERIALS, 2008, 18 (16) :2373-2380

[2] Simulated annealing analysis of Rutherford backscattering data [J].

Barradas, NP ;

Jeynes, C ;

Webb, RP .

APPLIED PHYSICS LETTERS, 1997, 71 (02) :291-293

[3] PCDTBT: en route for low cost plastic solar cells [J].

Beaupre, Serge ;

Leclerc, Mario .

JOURNAL OF MATERIALS CHEMISTRY A, 2013, 1 (37) :11097-11105

[4] Morphology-Dependent Trap Formation in High Performance Polymer Bulk Heterojunction Solar Cells [J].

Beiley, Zach M. ;

Hoke, Eric T. ;

Noriega, Rodrigo ;

Dacuna, Javier ;

Burkhard, George F. ;

Bartelt, Jonathan A. ;

Salleo, Alberto ;

Toney, Michael F. ;

McGehee, Michael D. .

ADVANCED ENERGY MATERIALS, 2011, 1 (05) :954-962

[5] A low-bandgap poly(2,7-carbazole) derivative for use in high-performance solar cells [J].

Blouin, Nicolas ;

Michaud, Alexandre ;

Leclerc, Mario .

ADVANCED MATERIALS, 2007, 19 (17) :2295-+

[6]

Bronstein H., 2013, ADV FUNC MAT

[7] Application of ion scattering techniques to characterize polymer surfaces and interfaces [J].

Composto, RJ ;

Walters, RM ;

Genzer, J .

MATERIALS SCIENCE & ENGINEERING R-REPORTS, 2002, 38 (3-4) :107-180

[8]

Cowan S. R., 2011, THESIS U CALIFORNIA

[9] A solution concentration dependent transition from self-stratification to lateral phase separation in spin-cast PS:d-PMMA thin films [J].

Dunbar, A. D. F. ;

Mokarian-Tabari, P. ;

Parnell, A. J. ;

Martin, S. J. ;

Skoda, M. W. A. ;

Jones, R. A. L. .

EUROPEAN PHYSICAL JOURNAL E, 2010, 31 (04) :369-375

[10] In Situ Imaging and Height Reconstruction of Phase Separation Processes in Polymer Blends during Spin Coating [J].

Ebbens, Stephen ;

Hodgkinson, Richard ;

Parnell, Andrew J. ;

Dunbar, Alan ;

Martin, Simon J. ;

Topham, Paul D. ;

Clarke, Nigel ;

Howse, Jonathan R. .

ACS NANO, 2011, 5 (06) :5124-5131

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