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Visualization of Hierarchical Nanodomains in Polymer/Fullerene Bulk Heterojunction Solar Cells

  • Jianguo Wen (a1), Dean J. Miller (a1), Wei Chen (a2) (a3), Tao Xu (a4), Luping Yu (a4), Seth B. Darling (a5) (a3) and Nestor J. Zaluzec (a1)...

Abstract

Traditional electron microscopy techniques such as bright-field imaging provide poor contrast for organic films and identification of structures in amorphous material can be problematic, particularly in high-performance organic solar cells. By combining energy-filtered corrected transmission electron microscopy, together with electron energy loss and X-ray energy-dispersive hyperspectral imaging, we have imaged PTB7/PC61BM blended polymer optical photovoltaic films, and were able to identify domains ranging in size from several hundred nanometers to several nanometers in extent. This work verifies that microstructural domains exist in bulk heterojunctions in PTB7/PC61BM polymeric solar cells at multiple length scales and expands our understanding of optimal device performance providing insight for the design of even higher performance cells.

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*Corresponding author. jgwen@anl.gov; miller@anl.gov

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Brabec, C.J., Gowrisanker, S., Halls, J.J.M., Laird, D., Jia, S. & Williams, S.P. (2010). Polymer–fullerene bulk-heterojunction solar cells. Adv Mater 22, 38393856.
Brabec, C.J., Heeney, M., McCulloch, I. & Nelson, J. (2011). Influence of blend microstructure on bulk heterojunction organic photovoltaic performance. Chem Soc Rev 40, 11851199.
Brady, M.A., Su, G.M. & Chabinyc, M.L. (2011). Recent progress in the morphology of bulk heterojunction photovoltaics. Soft Matter 7, 1106511077.
Chen, W., Xu, T., He, F., Wang, W., Wang, C., Strzalka, J., Liu, Y., Wen, J., Miller, D.J., Chen, J., Hong, K., Yu, L. & Darling, S.B. (2011). Hierarchical morphologies promote exciton dissociation in polymer/fullerene bulk heterojunction solar cells. Nano Lett 11, 37073713.
Chen, Y.-H., Lin, L.-Y., Lu, C.-W., Lin, F., Huang, Z.-Y., Lin, H.-W., Wang, P.-H., Liu, Y.-H., Wong, K.-T., Wen, J., Miller, D.J. & Darling, S.B. (2012). Vacuum-deposited small-molecule organic solar cells with high power conversion efficiencies by judicious molecular design and device optimization. J Am Chem Soc 134, 1361613623.
Darling, S.B. & You, F. (2013). The case for organic photovoltaics. RSC Advances 3, 1763317648.
DeLongchamp, D.M., Kline, R.J. & Herzing, A. (2012). Nanoscale structure measurements for polymer-fullerene photovoltaics. Energy Environ Sci 5, 59805993.
Egerton, R.F. (1996). Electron Energy-Loss Spectroscopy in the Electron Microscope. New York: Springer.
Giridharagopal, R. & Ginger, D.S. (2010). Characterizing morphology in bulk heterojunction organic photovoltaic systems. J Phys Chem Lett 1, 11601169.
Green, M.A., Emery, K., Hishikawa, Y. & Warta, W. (2011). Solar cell efficiency tables. Prog Photovolt Res Appl 19, 8492.
Haider, M., Hartel, P., Müller, H., Uhlemann, S. & Zach, J. (2009). Current and future aberration correctors for the improvement of resolution in electron microscopy. Philos Trans A Math Phys Eng Sci 367, 36653682.
He, F. & Yu, L. (2011). How far can polymer solar cells go? In need of a synergistic approach. J Phys Chem Lett 2, 31023113.
He, Z., Zhong, C., Huang, X., Wong, W., Wu, H., Chen, L., Su, S. & Cao, Y. (2011). Simultaneous enhancement of open-circuit voltage, short-circuit current density, and fill factor in polymer solar cells. Adv Mater 23, 46364643.
Herzing, A.A., Richter, L.J. & Anderson, I.M. (2010). 3D nanoscale characterization of thin-film organic photovoltaic device structures via spectroscopic contrast in the TEM 1. J Phys Chem C 114, 1750117508.
Hoppe, H. & Sariciftci, N.S. (2006). Morphology of polymer/fullerene bulk heterojunction solar cells. J Mater Chem 16, 4561.
Kabius, B., Hartel, P., Haider, M., Müller, H., Uhlemann, S., Loebau, U., Zach, J. & Rose, H. (2009). First application of Cc-corrected imaging for high-resolution and energy-filtered TEM. J Electron Microsc 58, 147155.
Lee, J.K., Ma, W.L., Brabec, C.J., Yuen, J., Moon, J.S., Kim, J.Y., Lee, K., Bazan, G.C. & Heeger, A.J. (2008). Processing additives for improved efficiency from bulk heterojunction solar cells. J Am Chem Soc 130, 36193623.
Li, G., Zhu, R. & Yang, Y. (2012). Polymer solar cells. Nat Photonics 6, 153161.
Liang, Y., Xu, Z., Xia, J., Tsai, S., Wu, Y., Li, G., Ray, C. & Yu, L. (2010). For the bright future—bulk heterojunction polymer solar cells with power conversion efficiency of 7.4%. Adv Mater 22, E135E138.
McNeill, C.R. (2012). Morphology of all-polymer solar cells. Energy Environ Sci 5, 56535667.
Miller, D.J., Dahmen, U. & Stach, E.A. (2011). New opportunities for in situ science based on the TEAM platform. Microsc Microanal 17, 450451.
Pearson, A.J., Boden, S.A., Bagnall, D.M., Lidzey, D.G. & Rodenburg, C. (2011). Imaging the bulk nanoscale morphology of organic solar cell blends using helium ion microscopy. Nano Lett 11, 42754281.
Pfannmöller, M., Flügge, H., Benner, G., Wacker, I., Kowalsky, W. & Schröder, R.R. (2012). Visualizing photovoltaic nanostructures with high-resolution analytical electron microscopy reveals material phases in bulk heterojunctions. Synth Met 161, 25262533.
Pfannmöller, M., Flügge, H., Benner, G., Wacker, I., Sommer, C., Hanselmann, M., Schmale, S., Schmidt, H., Hamprecht, F.A., Rabe, T., Kowalsky, W. & Schröder, R.R. (2011). Visualizing a homogeneous blend in bulk heterojunction polymer solar cells by analytical electron microscopy. Nano Lett 11, 30993107.
Pines, D. (1999). Elementary Excitations in Solids: Lectures on Phonons, Electrons, and Plasmons. New York: Westview Press.
Pingree, L.S.C., Reid, O.G. & Ginger, D.S. (2009). Imaging the evolution of nanoscale photocurrent collection and transport networks during annealing of polythiophene/fullerene solar cells. Nano Lett 9, 29462952.
Rose, H. & Wan, W. (2005). Aberration Correction in Electron Microscopy, 16–20 May 2005, Proceedings of the 2005 Particle Accelerator Conference, Tennessee, USA, pp. 44–48.
Ruderer, M.A. & Müller-Buschbaum, P. (2011). Morphology of polymer-based bulk heterojunction films for organic photovoltaics. Soft Matter 7, 54825493.
Schindler, W., Wollgarten, M. & Fostiropoulos, K. (2012). Revealing nanoscale phase separation in small-molecule photovoltaic blends by plasmonic contrast in the TEM. Org Electron 13, 11001104.
Wen, J.G., Miller, D.J., Zaluzec, N.J., Chen, W. & Darling, S.B. (2012). Hierarchical nanodomains in polymer-fullerene bulk heterojunction solar cells observed using Cc-corrected energy-filtered TEM. Microsc Microanal 18, 13361337.
Wen, J.G., Miller, D.J., Zaluzec, N.J., Hiller, J.M. & Cook, R.E. (2013). Contribution of Cc-correction to high-resolution TEM at all energy loss regimes. Microsc Microanal 19, 594595.
Williams, D.B. & Carter, C.B. (1996). Transmission Electron Microscopy: A Textbook for Materials Science. New York: Springer.
Yu, G., Gao, J., Hummelen, J.C., Wudl, F. & Heeger, A.J. (1995). Polymer photovoltaic cells: Enhanced efficiencies via a network of internal donor-acceptor heterojunctions. Science 270, 17891791.

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Visualization of Hierarchical Nanodomains in Polymer/Fullerene Bulk Heterojunction Solar Cells

  • Jianguo Wen (a1), Dean J. Miller (a1), Wei Chen (a2) (a3), Tao Xu (a4), Luping Yu (a4), Seth B. Darling (a5) (a3) and Nestor J. Zaluzec (a1)...

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