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International Journal of Photoenergy
Volume 2010 (2010), Article ID 123534, 11 pages
http://dx.doi.org/10.1155/2010/123534
Review Article

Organic Solar Cells: Problems and Perspectives

Dipartimento di Chimica, Università degli Studi della Calabria, 87036 Arcavacata di Rende, Italy

Received 18 March 2010; Accepted 12 May 2010

Academic Editor: Leonardo Palmisano

Copyright © 2010 G. Chidichimo and L. Filippelli. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Linked References

  1. R. N. Marks, J. J. M. Halls, D. D. C. Bradley, R. H. Friend, and A. B. Holmes, “The photovoltaic response in poly(p-phenylene vinylene) thin-film devices,” Journal of Physics: Condensed Matter, vol. 6, no. 7, pp. 1379–1394, 1994. View at Publisher · View at Google Scholar · View at Scopus
  2. G. Yu, J. Gao, J. C. Hummelen, F. Wudl, and A. J. Heeger, “Polymer photovoltaic cells: enhanced efficiencies via a network of internal donor-acceptor heterojunctions,” Science, vol. 270, no. 5243, pp. 1789–1791, 1995. View at Google Scholar · View at Scopus
  3. C. J. Brabec, N. S. Sariciftci, and J. C. Hummelen, “Plastic solar cells,” Advanced Funtional Materials, vol. 11, no. 1, pp. 15–26, 2001. View at Publisher · View at Google Scholar · View at Scopus
  4. W. Brutting, Ed., Physics of Organic Semiconductors, Wiley-VCH, Weinheim, Germany, 2005.
  5. C. Brabec, V. Dyakonov, J. Parisi, and N. S. Sariciftci, Eds., Organic Photovoltaics: Concepts and Realization, Springer, New York, NY, USA, 2003.
  6. S. S. Sun and N. S. Sariciftci, Eds., Organic Photovoltaics: Mechanisms, Materials, and Devices, Taylor < Francis, New York, NY, USA, 2005.
  7. S. Günes, H. Neugebauer, and N. S. Sariciftci, “Conjugated polymer-based organic solar cells,” Chemical Reviews, vol. 107, no. 4, pp. 1324–1338, 2007. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
  8. J. Xue, B. P. Rand, S. Uchida, and S. R. Forrest, “A hybrid planar-mixed molecular heterojunction photovoltaic cell,” Advanced Materials, vol. 17, no. 1, pp. 66–71, 2005. View at Publisher · View at Google Scholar · View at Scopus
  9. B. Kippelen and J.-L. Brédas, “Organic photovoltaics,” Energy and Environmental Science, vol. 2, no. 3, pp. 251–261, 2009. View at Publisher · View at Google Scholar · View at Scopus
  10. C. W. Tang, “Two-layer organic photovoltaic cell,” Applied Physics Letters, vol. 48, no. 2, pp. 183–185, 1986. View at Publisher · View at Google Scholar · View at Scopus
  11. B. P. Rand, J. Genoe, P. Heremans, and J. Poortmans, “Solar cells utilizing small molecular weight organic semiconductors,” Progress in Photovoltaics: Research and Applications, vol. 15, no. 8, pp. 659–676, 2007. View at Publisher · View at Google Scholar · View at Scopus
  12. K. L. Mutolo, E. I. Mayo, B. P. Rand, S. R. Forrest, and M. E. Thompson, “Enhanced open-circuit voltage in subphthalocyanine/C60 organic photovoltaic cells,” Journal of the American Chemical Society, vol. 128, no. 25, pp. 8108–8109, 2006. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
  13. H. Gommans, D. Cheyns, T. Aernouts, C. Girotto, J. Poortmans, and P. Heremans, “Electro-optical study of subphthalocyanine in a bilayer organic solar cell,” Advanced Functional Materials, vol. 17, no. 15, pp. 2653–2658, 2007. View at Publisher · View at Google Scholar · View at Scopus
  14. P. Peumans, A. Yakimov, and S. R. Forrest, “Small molecular weight organic thin-film photodetectors and solar cells,” Journal of Applied Physics, vol. 93, no. 7, pp. 3693–3723, 2003. View at Publisher · View at Google Scholar · View at Scopus
  15. H. Paul, C. David, and B. P. Rand, “Strategies for increasing the efficiency of heterojunction organic solar cells: material selection and device architecture,” Accounts of Chemical Research, vol. 42, no. 11, pp. 1740–1747, 2009. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
  16. H. Ogata, R. Higashi, and N. Kobayashi, “Electronic absorption spectra of substituted phthalocyanines in solution and as films,” Journal of Porphyrins and Phthalocyanines, vol. 7, no. 8, pp. 551–557, 2003. View at Google Scholar · View at Scopus
  17. R. D. George, A. W. Snow, J. S. Shirk, and W. R. Barger, “The alpha substitution effect on phthalocyanine aggregation,” Journal of Porphyrins and Phthalocyanines, vol. 2, no. 1, pp. 1–7, 1998. View at Google Scholar · View at Scopus
  18. E. Bundgaard and F. C. Krebs, “Low band gap polymers for organic photovoltaics,” Solar Energy Materials and Solar Cells, vol. 91, no. 11, pp. 954–985, 2007. View at Publisher · View at Google Scholar · View at Scopus
  19. G. P. Smestad, F. C. Krebs, C. M. Lampert, C. G. Granqvist, K. L. Chopra, X. Mathew, and H. Takakura, “Reporting solar cell efficiencies in Solar Energy Materials and Solar Cells,” Solar Energy Materials and Solar Cells, vol. 92, no. 4, pp. 371–373, 2008. View at Publisher · View at Google Scholar · View at Scopus
  20. R. F. Bailey-Salzman, B. P. Rand, and S. R. Forrest, “Near-infrared sensitive small molecule organic photovoltaic cells based on chloroaluminum phthalocyanine,” Applied Physics Letters, vol. 91, no. 1, Article ID 013508, 3 pages, 2007. View at Publisher · View at Google Scholar · View at Scopus
  21. C.-J. Ko, Y.-K. Lin, F.-C. Chen, and C.-W. Chu, “Modified buffer layers for polymer photovoltaic devices,” Applied Physics Letters, vol. 90, no. 6, Article ID 063509, 3 pages, 2007. View at Publisher · View at Google Scholar · View at Scopus
  22. G. Li, V. Shrotriya, J. Huang, Y. Yao, T. Moriarty, K. Emery, and Y. Yang, “High-efficiency solution processable polymer photovoltaic cells by self-organization of polymer blends,” Nature Materials, vol. 4, no. 11, pp. 864–868, 2005. View at Publisher · View at Google Scholar · View at Scopus
  23. W. Ma, C. Yang, X. Gong, K. Lee, and A. J. Heeger, “Thermally stable, efficient polymer solar cells with nanoscale control of the interpenetrating network morphology,” Advanced Functional Materials, vol. 15, no. 10, pp. 1617–1622, 2005. View at Publisher · View at Google Scholar · View at Scopus
  24. M. Reyes-Reyes, K. Kim, and D. L. Carroll, “High-efficiency photovoltaic devices based on annealed poly(3-hexylthiophene) and 1-(3-methoxycarbonyl)-propyl-1- phenyl- (6,6) C61 blends,” Applied Physics Letters, vol. 87, no. 8, Article ID 083506, 3 pages, 2005. View at Publisher · View at Google Scholar · View at Scopus
  25. M. Reyes-Reyes, K. Kim, J. Dewald, R. López-Sandoval, A. Avadhanula, S. Curran, and D. L. Carroll, “Meso-structure formation for enhanced organic photovoltaic cells,” Organic Letters, vol. 7, no. 26, pp. 5749–5752, 2005. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
  26. R. Kroon, M. Lenes, J. C. Hummelen, P. W. M. Blom, and B. De Boer, “Small bandgap polymers for organic solar cells (polymer material development in the last 5 years),” Polymer Reviews, vol. 48, no. 3, pp. 531–582, 2008. View at Publisher · View at Google Scholar · View at Scopus
  27. Y. A.M. Ismail, T. Soga, and T. Jimbo, “Improvement in light harvesting and performance of P3HT:PCBM solar cell by using 9,10-diphenylanthracene,” Solar Energy Materials and Solar Cells, vol. 93, no. 9, pp. 1582–1586, 2009. View at Publisher · View at Google Scholar · View at Scopus
  28. P. Peumans, A. Yakimov, and S. R. Forrest, “Small molecular weight organic thin-film photodetectors and solar cells,” Journal of Applied Physics, vol. 93, no. 7, pp. 3693–3723, 2003. View at Publisher · View at Google Scholar · View at Scopus
  29. L. A. A. Pettersson, L. S. Roman, and O. Inganäs, “Modeling photocurrent action spectra of photovoltaic devices based on organic thin films,” Journal of Applied Physics, vol. 86, no. 1, pp. 487–496, 1999. View at Google Scholar · View at Scopus
  30. D. Cheyns, B. P. Rand, B. Verreet, J. Genoe, J. Poortmans, and P. Heremans, “The angular response of ultrathin film organic solar cells,” Applied Physics Letters, vol. 92, no. 24, Article ID 243310, 2008. View at Publisher · View at Google Scholar · View at Scopus
  31. H. Gommans, D. Cheyns, T. Aernouts, C. Girotto, J. Poortmans, and P. Heremans, “Electro-optical study of subphthalocyanine in a bilayer organic solar cell,” Advanced Functional Materials, vol. 17, no. 15, pp. 2653–2658, 2007. View at Publisher · View at Google Scholar · View at Scopus
  32. B. Verreet, S. Schols, and S. Schols, “The characterization of chloroboron (iii) subnaphthalocyanine thin films and their application as a donor material for organic solar cells,” Journal of Materials Chemistry, vol. 19, no. 30, pp. 5295–5297, 2009. View at Publisher · View at Google Scholar · View at Scopus
  33. R. H. Friend, G. J. Denton, and G. J. Denton, “Electronic excitations in luminescent conjugated polymers,” Solid State Communications, vol. 102, no. 2-3, pp. 249–258, 1997. View at Google Scholar · View at Scopus
  34. R. H. Friend, G. J. Denton, and G. J. Denton, “Electronic processes of conjugated polymers in semiconductor device structures,” Synthetic Metals, vol. 84, no. 1–3, pp. 463–470, 1997. View at Google Scholar · View at Scopus
  35. J. Simon and J.J. André, Molecular Semiconductors, Springer, Berlin, Germany, 1985.
  36. M. Riede, T. Mueller, W. Tress, R. Schueppel, and K. Leo, “Small-molecule solar cells—status and perspectives,” Nanotechnology, vol. 19, no. 42, Article ID 424001, 2008. View at Publisher · View at Google Scholar · View at Scopus
  37. B. P. Rand, J. Genoe, P. Heremans, and J. Poortmans, “Solar cells utilizing small molecular weight organic semiconductors,” Progress in Photovoltaics: Research and Applications, vol. 15, no. 8, pp. 659–676, 2007. View at Publisher · View at Google Scholar · View at Scopus
  38. B. C. Thompson and J. M. J. Fréchet, “Polymer-fullerene composite solar cells,” Angewandte Chemie - International Edition, vol. 47, no. 1, pp. 58–77, 2008. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
  39. G. Dennler, M. C. Scharber, and C. J. Brabec, “Polymer-fullerene bulk-heterojunction solar cells,” Advanced Materials, vol. 21, no. 13, pp. 1323–1338, 2009. View at Publisher · View at Google Scholar · View at Scopus
  40. E. Kymakis, I. Alexandrou, and G. A. J. Amaratunga, “High open-circuit voltage photovoltaic devices from carbon-nanotube-polymer composites,” Journal of Applied Physics, vol. 93, no. 3, pp. 1764–1768, 2003. View at Publisher · View at Google Scholar · View at Scopus
  41. E. Kymakis and G. A. J. Amaratunga, “Photovoltaic cells based on dye-sensitisation of single-wall carbon nanotubes in a polymer matrix,” Solar Energy Materials and Solar Cells, vol. 80, no. 4, pp. 465–472, 2003. View at Publisher · View at Google Scholar · View at Scopus
  42. J. J. M. Halls, C. A. Walsh, N. C. Greenham, E. A. Marseglla, R. H. Friend, S. C. Moratti, and A. B. Holmes, “Efficient photodiodes from interpenetrating polymer networks,” Nature, vol. 376, no. 6540, pp. 498–500, 1995. View at Google Scholar · View at Scopus
  43. G. Yu and A. J. Heeger, “Charge separation and photovoltaic conversion in polymer composites with internal donor/acceptor heterojunctions,” Journal of Applied Physics, vol. 78, no. 7, pp. 4510–4515, 1995. View at Publisher · View at Google Scholar · View at Scopus
  44. C. R. McNeill, A. Abrusci, and A. Abrusci, “Dual electron donor/electron acceptor character of a conjugated polymer in efficient photovoltaic diodes,” Applied Physics Letters, vol. 90, no. 19, Article ID 193506, 2007. View at Publisher · View at Google Scholar · View at Scopus
  45. F. S. Bates and G. H. Fredrickson, “Block copolymers-designer soft materials,” Physics Today, vol. 52, no. 2, pp. 32–38, 1999. View at Google Scholar · View at Scopus
  46. F. Meyers, A. J. Heeger, and J. L. Brédas, “Fine tuning of the band gap in conjugated polymers via control of block copolymer sequences,” The Journal of Chemical Physics, vol. 97, no. 4, pp. 2750–2758, 1992. View at Google Scholar · View at Scopus
  47. M. Sommer, A. S. Lang, and M. Thelakkat, “Crystalline-crystalline donor-acceptor block copolymers,” Angewandte Chemie. International Edition, vol. 47, no. 41, pp. 7901–7904, 2008. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
  48. Q. Zhang, A. Cirpan, T. P. Russell, and T. Emrick, “Donor-acceptor poly(thiophene-block-perylene diimide) copolymers: Synthesis and solar cell fabrication,” Macromolecules, vol. 42, no. 4, pp. 1079–1082, 2009. View at Publisher · View at Google Scholar · View at Scopus
  49. V. de Cupere, J. Tant, P. Viville, R. Lazzaroni, W. Osikowicz, W. R. Salaneck, and Y. H. Geerts, “Effect of interfaces on the alignment of a discotic liquid-crystalline phthalocyanine,” Langmuir, vol. 22, no. 18, pp. 7798–7806, 2006. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
  50. A. J. J. M. van Breemen, P. T. Herwig, and P. T. Herwig, “Large area liquid crystal monodomain field-effect transistors,” Journal of the American Chemical Society, vol. 128, no. 7, pp. 2336–2345, 2006. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
  51. A. Tracz, J. K. Jeszka, M. D. Watson, W. Pisula, K. Müllen, and T. Pakula, “Uniaxial alignment of the columnar super-structure of a hexa (alkyl) hexa-peri-hexabenzocoronene on untreated glass by simple solution processing,” Journal of the American Chemical Society, vol. 125, no. 7, pp. 1682–1683, 2003. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
  52. W. Pisula, A. Menon, and A. Menon, “A zone-casting technique for device fabrication of field-effect transistors based on discotic hexa-peri-hexabenzocoronene,” Advanced Materials, vol. 17, no. 6, pp. 684–689, 2005. View at Publisher · View at Google Scholar · View at Scopus
  53. H. Monobe, K. Awazu, and Y. Shimizu, “Change of liquid-crystal domains by vibrational excitation for a columnar mesophase,” Advanced Materials, vol. 12, no. 20, pp. 1495–1499, 2000. View at Publisher · View at Google Scholar · View at Scopus
  54. S. Zimmermann, J. H. Wendorff, and C. Weder, “Uniaxial orientation of columnar discotic liquid crystals,” Chemistry of Materials, vol. 14, no. 5, pp. 2218–2223, 2002. View at Publisher · View at Google Scholar · View at Scopus
  55. O. Bunk, M. M. Nielsen, T. I. Sølling, A. M. Van de Craats, and N. Stutzmann, “Induced alignment of a solution-cast discotic hexabenzocoronene derivative for electronic devices investigated by surface X-ray diffraction,” Journal of the American Chemical Society, vol. 125, no. 8, pp. 2252–2258, 2003. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
  56. F. J. M. Hoeben, P. Jonkheijm, E. W. Meijer, and A. P. H. J. Schenning, “About supramolecular assemblies of π-conjugated systems,” Chemical Reviews, vol. 105, no. 4, pp. 1491–1546, 2005. View at Publisher · View at Google Scholar · View at PubMed
  57. J. A. A. W. Elemans, A. E. Rowan, and R. J. M. Nolte, “Mastering molecular matter. Supramolecular architectures by hierarchical self-assembly,” Journal of Materials Chemistry, vol. 13, no. 11, pp. 2661–2670, 2003. View at Publisher · View at Google Scholar
  58. C. D. Simpson, J. Wu, M. D. Watson, and K. Müllen, “From graphite molecules to columnar superstructures—an exercise in nanoscience,” Journal of Materials Chemistry, vol. 14, no. 4, pp. 494–504, 2004. View at Google Scholar
  59. D. Adam, P. Schuhmacher, and P. Schuhmacher, “Fast photoconduction in the highly ordered columnar phase of a discotic liquid crystal,” Nature, vol. 371, no. 6493, pp. 141–143, 1994. View at Publisher · View at Google Scholar
  60. X. Crispin, J. Cornil, and J. Cornil, “Electronic delocalization in discotic liquid crystals: a joint experimental and theoretical study,” Journal of the American Chemical Society, vol. 126, no. 38, pp. 11889–11899, 2004. View at Publisher · View at Google Scholar · View at PubMed
  61. J. M. Warman, M. P. De Haas, G. Dicker, F. C. Grozema, J. Piris, and M. G. Debije, “Charge mobilities in organic semiconducting materials determined by pulse-radiolysis time-resolved microwave conductivity: π-Bond-conjugated polymers versus π-π-stacked discotics,” Chemistry of Materials, vol. 16, no. 23, pp. 4600–4609, 2004. View at Publisher · View at Google Scholar
  62. Z. An, J. Yu, and J. Yu, “High electron mobility in room-temperature discotic liquid-crystalline perylene diimides,” Advanced Materials, vol. 17, no. 21, pp. 2580–2583, 2005. View at Publisher · View at Google Scholar
  63. B. A. Jones, M. J. Ahrens, M.-H. Yoon, A. Facchetti, T. J. Marks, and M. R. Wasielewski, “High-mobility air-stable n-type semiconductors with processing versatility: dicyanoperylene-3,4:9,10-bis(dicarboximides),” Angewandte Chemie - International Edition, vol. 43, no. 46, pp. 6363–6366, 2004. View at Publisher · View at Google Scholar · View at PubMed
  64. H. Iino, Y. Takayashiki, J.-I. Hanna, R. J. Bushby, and D. Haarer, “High electron mobility of 0.1 cm2V-1s-1 in the highly ordered columnar phase of hexahexylthiotriphenylene,” Applied Physics Letters, vol. 87, no. 19, Article ID 192105, 3 pages, 2005. View at Publisher · View at Google Scholar
  65. D. Markovitsi, S. Marguet, J. Bondkowski, and S. Kumar, “Triplet excitation transfer in triphenylene columnar phases,” Journal of Physical Chemistry B, vol. 105, no. 7, pp. 1299–1306, 2001. View at Google Scholar
  66. L. Schmidt-Mende, A. Fechtenkötter, K. Müllen, E. Moons, R. H. Friend, and J. D. MacKenzie, “Self-organized discotic liquid crystals for high-efficiency organic photovoltaics,” Science, vol. 293, no. 5532, pp. 1119–1122, 2001. View at Publisher · View at Google Scholar · View at PubMed
  67. G. Chidichimo, G. De Filpo, S. Manfredi, S. Mormile, L. Tortora, C. Gallucci, and R. Cassano, “High contrast reverse mode PDLC films: A morphologic and electro-Optical analysis,” Molecular Crystals and Liquid Crystals, vol. 500, pp. 10–22, 2009. View at Publisher · View at Google Scholar
  68. M. Grätzel, “Photoelectrochemical cells,” Nature, vol. 414, no. 6861, pp. 338–344, 2001. View at Publisher · View at Google Scholar · View at PubMed
  69. H. Nusbaumer, J.-E. Moser, S. M. Zakeeruddin, M. K. Nazeeruddin, and M. Grätzel, “CoII(dbbip)22+ complex rivals tri-iodide/iodide redox mediator in dye-sensitized photovoltaic cells,” Journal of Physical Chemistry B, vol. 105, no. 43, pp. 10461–10464, 2001. View at Publisher · View at Google Scholar
  70. S. Hattori, Y. Wada, S. Yanagida, and S. Fukuzumi, “Blue copper model complexes with distorted tetragonal geometry acting as effective electron-transfer mediators in dye-sensitized solar cells,” Journal of the American Chemical Society, vol. 127, no. 26, pp. 9648–9654, 2005. View at Publisher · View at Google Scholar · View at PubMed
  71. W. Kubo, K. Murakoshi, and K. Murakoshi, “Quasi-solid-state dye-sensitized TiO2 solar cells: effective charge transport in mesoporous space filled with gel electrolytes containing iodide and iodine,” Journal of Physical Chemistry B, vol. 105, no. 51, pp. 12809–12815, 2001. View at Publisher · View at Google Scholar
  72. L. Sicot, C. Fiorini, A. Lorin, J.-M. Nunzi, P. Raimond, and C. Sentein, “Dye sensitized polythiophene solar cells,” Synthetic Metals, vol. 102, no. 1–3, pp. 991–992, 1999. View at Publisher · View at Google Scholar
  73. D. Gebeyehu, C. J. Brabec, and C. J. Brabec, “Hybrid solar cells based on dye-sensitized nanoporous TiO2 electrodes and conjugated polymers as hole transport materials,” Synthetic Metals, vol. 125, no. 3, pp. 279–287, 2002. View at Publisher · View at Google Scholar
  74. K. Murakoshi, R. Kogure, Y. Wada, and S. Yanagida, “Fabrication of solid-state dye-sensitized TiO2 solar cells combined with polypyrrole,” Solar Energy Materials and Solar Cells, vol. 55, no. 1-2, pp. 113–125, 1998. View at Google Scholar
  75. I. Gonzalez-Valls and M. Lira-Cantu, “Vertically-aligned nanostructures of ZnO for excitonic solar cells: a review,” Energy and Environmental Science, vol. 2, no. 1, pp. 19–34, 2009. View at Publisher · View at Google Scholar
  76. L. Sicot, C. Fiorini, A. Lorin, P. Raimond, C. Sentein, and J.-M. Nunzi, “Improvement of the photovoltaic properties of polythiophene-based cells,” Solar Energy Materials and Solar Cells, vol. 63, no. 1, pp. 49–60, 2000. View at Publisher · View at Google Scholar