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Conjugated Polymer Surfaces and Interfaces for Light-Emitting Devices

  • W.R. Salaneck and J.L. Brédas

Extract

Since the discovery of high electrical conductivity in doped polyacetylene in 1977, π-conjugated polymers have emerged as viable semiconducting electronic materials for numerous applications. In the context of polymer electronic devices, one must understand the nature of the polymer surface's electronic structure and the interface with metals. For conjugated polymers, photoelectron spectroscopy—especially in connection with quantum-chemical modeling—provides a maximum amount of both chemical and electronic structural information in one (type of) measurement. Some details of the early stages of interface formation with metals on the surfaces of conjugated polymers and model molecular solids in connection with polymer-based light-emitting devices (LEDs) are outlined. Then a chosen set of issues is summarized in a band structure diagram for a polymer LED, based upon a “clean calcium electrode” on the clean surface of a thin film of poly(p-phenylene vinylene) (PPV). This diagram helps to point out the complexity of the systems involved in polymer LEDs. No such thing as “an ideal metal-on-polymer contact” exists. There is always some chemistry occurring at the interface.

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1.Brédas, J.L. and Silbey, R., Conjugated Polymers (Kluwer Academic Publishers, Dordrecht, 1991).
2.Salaneck, W.R., Lundström, I., and B. Rånby, , in Proc. 81st Nobel Symp. in Chemistry: Conjugated Polymers and Related Materials; The Interconnection of Chemical and Electronic Structure (Oxford University Press, Oxford, 1993).
3.Skotheim, T., Reynolds, J.R., and Elsenbaumer, R.L., Handbook of Conducting Polymers-II (Marcel Dekker, Inc., New York, 1997).
4.Burroughes, J.H., Bradley, D.D.C., Brown, A.R., Marks, R.N., Mackay, K., Friend, R.H., Burn, P.L., and Holmes, A.B., Nature 347 (1990) p. 539.
5.Friend, R.H., in Nobel Symposium in Chemistry: Conjugated Polymers and Related Materials; The Interconnection of Chemical and Electronic Structure, edited by Salaneck, W.R., Lundström, I., and Rånby, B. (Oxford University Press, Oxford, 1993) p. 285.
6.Braun, D. and Heeger, A.J., Appl. Phys. Lett. 58 (1991) p. 1982.
7.Burn, P.L., Holmes, A.B., Kraft, A., Bradley, D.D.C., Brown, A.R., and Friend, R.H., J. Chem. Soc., Chem. Commun. (1992) p. 32.
8.Burn, P.L., Kraft, A., Bradley, D.D.C., Brown, A.R., Friend, R.H., Gymer, R.W., and Jackson, R.W., J. Am. Chem. Soc. 115 (1993) p. 10117.
9.Gill, R.E., Malliaras, G.G., Wildeman, J., and Hadziioannou, G., Adv. Mater. 6 (1994) p. 132.
10.Grem, G., Leditzky, G., Ultrich, B., and Leising, G., Adv. Mater. 4 (1992) p. 36.
11.Gustavsson, G., Cao, Y., Treacy, G.M., Klavetter, F., Colaneri, N., and Heeger, A.J., Nature 357 (1992) p. 477.
12.Halliday, D.A., Burn, P.L., Bradley, D.D.C., Friend, R.H., Gelsen, O.M., Holmes, A.B., Kraft, A., Martens, J.H.F., and Pichler, K., Adv. Mater. 5 (1993) p. 40.
13.Ohmori, Y., Uchida, M., Muro, K., and Yoshino, K., Jpn. J. Appl. Phys. 30 (1991) p. L1938.
14.Ohmori, Y., Uchida, M., Muro, K., and Yoshino, K., Solid State Commun. 80 (1991) p. 605.
15.Parker, I.D., J. Appl. Phys. 75 (1994) p. 1656.
16.Greenham, N.C., Moratti, S.C., Bradley, D.D.C., Friend, R.H., and Holmes, A.B., Nature 365 (1993) p. 628.
17.Salaneck, W.R., Stafström, S., and Brédas, J.L., Conjugated Polymer Surfaces and Interfaces (Cambridge University Press, Cambridge, 1996).
18.Lögdlund, M., Dannetun, P., and Salaneck, W.R., “Electronic and Chemical Structure of Polymer Surfaces and Interfaces as studied by Photoelectron Spectroscopy,” in Handbook of Conducting Polymers-II, edited by Skotheim, T., Reynolds, J.R., and Elsenbaumer, R.L. (Marcel Dekker, Inc., New York, 1997).
19.Fahlman, M., Beljonne, D., Lögdlund, M., Burn, P.L., Holmes, A.B., Friend, R.H., Brédas, J.L., and Salaneck, W.R., Chem. Phys. Lett. 214 (1993) p. 327.
20.Dannetun, P., private communication.
21.Fahlman, M., Rasmusson, J., Kaeriyama, K., Clark, D.T., Beamson, G., and Salaneck, W.R., Synth. Met. 66 (1994) p. 123.
22.Fahlman, M., Moratti, S., Holmes, A.B., Salaneck, W.R., and Bredas, J.L., Chem. Eur. J. in press.
23.Salaneck, W.R., Inganäs, O., Thémans, B., Nilsson, J.O., Sjögren, B., Österholm, J-E., Bredas, J-L., and Svensson, S., J. Chem. Phys. 89 (1988) p. 4613.
24.Lögdlund, M., Lazzaroni, R., Stafström, S., Salaneck, W.R., and Brédas, J.L., Phys. Rev. Lett. 63 (1989) p. 1841.
25.Lazzaroni, R., Lögdlund, M., Stafström, S., Salaneck, W.R., and Brédas, J.L., J. Chem. Phys. 93 (1990) p. 6.
26.Lazzaroni, R., Lögdlund, M., Stafström, S., Salaneck, W.R., Bradley, D.D.C., Friend, R.H., Sato, N., Orti, E., and Brédas, J.L., “Electronic Structure of Processable Conducting Polymers,” Conjugated Polymeric Materials Opportunities in Electronics: Optoelectronics, and Molecular Electronics, edited by Brédas, J.L. and Chance, R. (NATO ASI Series E, vol. 182, Kluwer Academic, Dordrecht, 1990) p. 149.
27.Lazzaroni, R., Lögdlund, M., Calderone, A., Brédas, J.L., Dannetun, P., Fauquet, C., Fredriksson, C., Stafström, S., and Salaneck, W.R., Synth. Met. 71 (1995) p. 2159.
28.Spangler, C.W., Nickel, E.G., and Hall, T.J., Am. Chem. Soc., Div. Polym. Chem. 28 (1987) p. 219.
29.Lögdlund, M., Dannetun, P., Sjögren, B., Boman, M., Fredriksson, C., Stafström, S., and Salaneck, W.R., Synth. Met. 51 (1992) p. 187.
30.Lögdlund, M., Dannetun, P., Stafström, S., Salaneck, W.R., Ramsey, M.G., Spangler, C.W., Fredriksson, C., and Brédas, J.L., Phys. Rev. Lett. 70 (1993) p. 970.
31.Dannetun, P., Boman, M., Stafström, S., Salaneck, W.R., Lazzaroni, R., Fredriksson, C., Brédas, J.L., Zamboni, R., and Taliani, C., J. Chem. Phys. 99 (1993) p. 664.
32.Salaneck, W.R. and Brédas, J.L., Adv. Mater. 8 (1996) p. 48.
33.André, J.M., Dekhalle, J., and Brédas, J.L., Quantum Chemistry Aided Design of Organic Polymers (World Scientific, Singapore, 1991).
34.Brédas, J.L., Chance, R.R., Silbey, R., Nicolas, G., and Durand, P., J. Chem. Phys. 75 (1981) p. 255.
35.Brédas, J.L. and Salaneck, W.R., “Characterization of the Interfaces between Low Work Function Metals and Conjugated Polymers in Light Emitting Diodes,” Organic Electroluminescence, edited by Bradley, D.D.C. and Tsutsui, T. (Cambridge University Press, Cambridge) in press.
36.Fredriksson, C. and Brédas, J.L., J. Chem. Phys. 98 (1993) p. 4253.
37.Dannetun, P., Lögdlund, M., Fredriksson, C., Lazzaroni, R., Fauquet, C., Stafström, S., Spangler, C.W., Brédas, J.L., and Salaneck, W.R., J. Chem. Phys. 100 (1994) p. 6765.
38.Dannetun, P., Fahlman, M., Fauquet, C., Kaerijama, K., Sonoda, Y., Lazzaroni, R., Bredas, J.L., and Salaneck, W.R., “Interface Formation Between Poly(2,5-diheptyl-p-phenylenevinylene) and Calcium: Implications for Light Emitting diodes,” Organic Materials for Electronics: Conjugated Polymer Interfaces with Metals and Semiconductors,” edited by Brédas, J.L., Salaneck, W.R., and Wegner, G. (North Holland, Amsterdam, 1994) p. 113.
39.Ettedgui, E., Razafitrimo, H., Gao, Y., and Hsieh, B.R., Synth. Met. 78 (1996) p. 247.
40.Gao, Y., Park, K.T., and Hsieh, B.R., J. Chem. Phys. 97 (1992) p. 6991.
41.Schott, M., “Undoped (Semiconducting) Conjugated Polymers,” Organic Conductors: Fundamentals and Applications, edited by Farges, J.P. (Marcel Dekker, Inc., New York, 1994) p. 539.
42.Salaneck, W.R., “Intermolecular Relaxation Energies in the Ultraviolet Photoelectron Spectroscopy of Molecular Solids: Molecular-Ion States in Aromatic Pendant Group Polyrhers,” Characterization of Molecular Structure of Polymers by Photon, Electron and Ion Probes,” edited by Fabish, T.J., Dwight, D., and Thomas, H.R. (Am. Chem. Soc., Washington, DC, 1981) p. 121.
43.Greenham, N.C. and Friend, R.H., Solid State Phys. 49 (1996) p. 1.
44.Hsieh, B.R., Ettedgui, E., Park, K.T., and Gao, Y., Mol. Cryst. Liq. Cryst. 256 (1994) p. 71.
45.Park, Y., Ettedgui, E., Choong, V., Gao, Y., Hsieh, B.R., Wehrmeister, T., and Mullen, K., Appl. Phys. Lett. 69 (1996) p. 1080.
46.Bröms, P., Birgersson, J., Johnsson, N., Lögdlund, M., and Salaneck, W.R., Synth. Met. 74 (1995) p. 179.
47.Lobatch, A., Rubin, I.R., and Sobolev, A.B., Status Solidi B 161 (1990) p. 271.
48.Kirm, M., Feldbach, E., Kink, R., Lushchik, A., Lushchik, C., Maaroos, A., and Martinson, I., J. Elec. Spec. Rel. Phenom. 79 (1996) p. 91.

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Conjugated Polymer Surfaces and Interfaces for Light-Emitting Devices

  • W.R. Salaneck and J.L. Brédas

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