Abstract
Organic electronics is currently experiencing a surge of activities worldwide prompted in part by recent advances in achieving high electronic mobility, light emission over a broad range of frequencies, demonstration of spin valve operation with giant magneto-resistance and other effects. Despite these encouraging promises, there are many roadblocks that hinder a broader proliferation of “plastic electronics” in contemporary technology. Such devices involve charge transport as a main process in their operation processes, and therefore, require high-performance charge-transporting materials. The charge-carrier mobility is the major determining factor for the speed of electronic devices. Arguably, the most significant of them is the challenge to achieve a comprehensive understanding of the fundamentals of charge injection and charge transport in organics. In spite of its simple definition, because of the difficulty of measuring velocity, accurate determination of the mobility of the carriers is not easy and indirect ways are used, each with its own advantages and disadvantages. The article discusses important mobility measurement techniques employed for organic optoelectronic devices.
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An Z., Yu J., Jones S.C., Barlow S., Yoo S., Domercq B., Prins P., Siebbeles L.D.A., Kippelen B., Marder S.R.: High electron mobility in room-temperature discotic liquid-crystalline perylene diimides. Adv. Mater. 17, 2580–2583 (2005)
Andersson, L.M.: Electronic Transport in Polymeric Solar Cells and Transistors Ph.D. Theses, Linkoping University, Sweden (2007)
Bassler H.: Charge transport in disordered organic photoconductors a monte carlo simulation study. Phys. Stat. Sol. B 175, 15 (1993)
Basu D., Wang L., Dunn L., Yoo B., Nadkarni S., Dodabalapur A., Heeney M., McCulloch I.: Direct measurement of carrier drift velocity and mobility in a polymer field-effect transistor. Appl. Phys. Lett. 89(24), 242104 (2006)
Berner D., Houili H., Leo W., Zuppiroli L.: Insights into OLED functioning through coordinated experimental measurements and numerical model simulations. Phys. Stat. Sol. A 202, 9 (2005)
Blom P.W.M., de Jong M.J.M., Vleggaar J.J.M.: Electron and hole transport in poly(p-phenylene vinylene) devices. Appl. Phys. Lett. 68(23), 3308 (1996)
Borsenberger P.M., Pautmeier L.T., Bässler H.: Nondispersive-to-dispersive charge-transport transition in disordered molecular solids. Phys. Rev. B 46(19), 12145–12153 (1992)
Bredas J.L., Street G.B.: Polarons, bipolarons, and solitons in conducting polymers. Acc. Chem. Res. 18, 309 (1985)
Cabanillas-Gonzalez J., Virgili T., Gambetta A., Lanzani G., Anthopoulos T.D., de Leeuw D.M.: Photoinduced transient stark spectroscopy in organic semiconductors: a method for charge mobility determination in the picosecond regime. Phys. Rev. Lett. 96(10), 106601–106605 (2006)
Campbell A.J., Bradley D.D.C., Antoniadis H: Trap-free, space-charge-limited currents in a polyfluorene copolymer using pretreated indium tin oxide as a hole injecting contact. Synth. Met. 122(1), 161–163 (2001)
Coropceanu V., Bredas J.L.: Organic transistors: a polarized response. Nat. Mater. 5, 929 (2006)
Dennler G., Mozer A.J., Juška G., Pivrikas A., Fuchsbauer R., Fuchsbauer A., Sariciftci N.S.: Charge carrier mobility and lifetime versus composition of conjugated polymer/fullerene bulk-heterojunction solar cells. Org. Electron. 7, 229–234 (2006)
Dimitrakopoulos C.D, Purushothaman S., Kymissis J., Callegari A., Shaw J.M.: Low-voltage organic transistors on plastic comprising high-dielectric constant gate insulators. Science 283, 822 (1999)
Dodabalapur A., Torsi L., Katz H.E.: Organic transistors: two-dimensional transport and improved electrical characteristics. Science 268, 270 (1995)
Ehinger, K., Roth, S.: Electronic properties of polymers and related compounds (solid state sciences series 63). In: Kuzmany, H., Mehring, M., Roth, S. (eds.) Springer, Berlin (1985)
Fichou D.: Handbook of Oligo-and Polythiophenes. Wiley-VCH, Weinheim, New York (1999)
Giebeler C., Antoniadis H., Bradley D.D.C., Shirota Y.: Space-charge-limited charge injection from indium tin oxide into a starburst amine and its implications for organic light-emitting diodes. Appl. Phys. Lett. 72(19), 2448 (1998)
Goldmann C., Haas S., Krellner C., Pernstich K.P., Gundlach D.J., Batlogg B.: Hole mobility in organic single crystals measured by a “flip-crystal” field-effect technique. J. Appl. Phys. 96(04), 2080 (2004)
Hamaguchi C.: Basic Semiconductor Physics, pp. 263. Springer, New Delhi (2001)
Heeger A.J., Kivelson S., Schrieffer J.R., Su W.P.: Solitons in conducting polymers. Rev. Mod. Phys. 60, 781–850 (1988)
Hoofman R.J.O.M., de Haas M.P., Siebbeles L.D.A., Warman J.M.: Highly mobile electrons and holes on isolated chains of the semiconducting polymer poly(phenylene vinylene). Nature 392, 54 (1998)
Horowitz G.: Organic field-effect transistors. Adv. Mater. 10(5), 365–422 (1998)
Horowitz G., Hajlaoui M.E., Hajlaoui R.: Temperature and gate voltage dependence of hole mobility in polycrystalline oligothiophene thin film transistors. J. Appl. Phys. 87, 4456 (2000)
Horowitz G.: Organic thin film transistors: from theory to real devices. J. Mater. Res. 19, 1946 (2004)
Hosokawa C., Tokailin H., Higashi H., Kusumoto T.: Transient behavior of organic thin film electroluminescence. Appl. Phys. Lett. 60(10), 1220 (1992)
Hosokawa C., Tokailin H., Higashi H., Kusumoto T.: Transient electroluminescence from hole transporting emitting layer in nanosecond region. Appl. Phys. Lett. 63(10), 1322 (1993)
Houili H., Picon J.D., Zuppiroli L., Bussac M.N.: Polarization effects in the channel of an organic field-effect transistor. J. Appl. Phys. 100, 023702 (2006)
Hoyniak D., Nowak E., Anderson R.L.: Channel electron mobility dependence on lateral electric field in field-effect transistors. J. Appl. Phys. 87, 876 (2000)
Hulea I.N., Fratini S., Xie H., Mulder C.L., Iossad N.N., Rastelli G., Ciuchi S., Morpurgo A.F.: Tunable Fröhlich polarons in organic single-crystal transistors. Nat. Mater. 5, 982 (2006)
Hung L.S., Chen C.H.: Recent progress of molecular organic electroluminescent materials and devices. Mater. Sci. Eng. R 39, 143–222 (2002)
Juska G., Arlauskas K., Viliunas M., Kocka J.: Extraction current transients: new method of study of charge transport in microcrystalline silicon. Phys. Rev. Lett. 84(21), 4946–4949 (2000)
Juška G., Genevičius K, Sliaužys G., Nekrašas N., R., Österbacka R.: Double injection in organic bulk-heterojunction. J. Non-Cryst. Solids 354(19–25), 2858–28611 (2008)
Jaiswal M., Menon R.: Polymer electronic materials: a review of charge transport. Polym. Int. 55(12), 1371–1384 (2006)
Kashima K., Sato H., Musha K., Kano K.-I., Takahashi T.: Carrier mobility for organic semiconductors: reduction of noise of the short part drift time in the time of flight mobility method. Anal. Sci. 23(10), 1249 (2007)
Kimura, M., Inoue, S., Shimada, K., Tokito, S., Noda, K., Taga, Y., Sawaki, Y.: Spirocycle-incorporated triphenylamine derivatives as an advanced organic electroluminescent material. Chem. Lett. 192, (2000)
Kirova N., Bussac M.N.: Self-trapping of electrons at the field-effect junction of a molecular crystal. Phys. Rev. B 68, 235312 (2003)
Kitamura M., Imada T., Kako S., Arakawa Y.: Time-of-flight measurement of lateral carrier mobility in organic thin films. Jpn. J. Appl. Phys. 43, 2326 (2004)
Lampert M.A., Mark P.: Current Injection in Solids. Academic Press, New York (1970)
Li L., Meller G., Kosina H.: Carrier concentration dependence of the mobility in organic semiconductors. Synth. Met. 157, 243–246 (2007)
Look D.C.: Schottky-barrier profiling techniques in semiconductors: gate current and parasitic resistance effects. J. Appl. Phys. 57, 377 (1984)
Mandoc M.M., de Boer B., Paasch G., Blom P.W.M.: Trap-limited electron transport in disordered semiconducting polymers. Phys. Rev. B 75(19), 193202 (2007)
Mizutani T.: Behavior of charge carriers in organic insulating materials. IEEE Conference on Electrical Insulation and Dielectric Phenomena 15, 1–10 (2006)
Mort, J., Pai, D.M. (eds): Photoconductivity and Related Phenomena. Elsevier, New York (1976)
Moses D.: Charge quantum yield and transient transport properties of anthracene and amorphous selenium. Solid State Commun. 69, 721 (1989)
Moses D.: Mechanism of carrier photo generation in amorphous selenium: fast transient photoconductivity. Phys. Rev. B 53, 4462 (1996)
Mozer A.J., Sariciftci N.S., Pivrikas A., Osterbacka R., Juška G., Brassat L., Bassler, H.: Charge carrier mobility in regioregular poly(3-hexylthiophene) probed by transient conductivity techniques: a comparative study. Phys. Rev. B 71, 035214 (2005a)
Mozer A.J., Sariciftci N.S., Lutsen L., Vanderzande D., Osterbacka R., Westerling M., Juska G.: Charge transport and recombination in bulk heterojunction solar cells studied by the photoinduced charge extraction in linearly increasing voltage technique. Appl. Phys. Lett. 86(11), 112104 (2005b)
Mozer A.Z., Dennler G., Sariciftci N.S., Westerling M., Pivrikas A., Österbacka R., Juška G.: Time-dependent mobility and recombination of the photoinduced charge carriers in conjugated polymer/fullerene bulk heterojunction solar cells. Phys. Rev. B 72, 035217 (2005c)
Okumoto K., Wayaku K., Noda T., Kageyama H., Shirota Y.: Amorphous molecular materials: charge transport in the glassy state of N, N′-di(biphenylyl)-N, N′-diphenyl-[1,1′-biphenyl] −4,4′-diamines. Synth. Met. 111–112, 473–476 (2000)
Pasveer W.F., Cottaar J., Tanase C., Coehoorn R., Bobbert P.A., Blom P.W.M., de Leeuw D.M., Michels M.A.J.: Unified description of charge-carrier mobilities in disordered semiconducting polymers. Phys. Rev. Lett. 94, 206601 (2005)
Pesavento P.V., Chesterfield R.J., Newman C.R., Frisbie C.D.: Gated four-probe measurements on pentacene thin-film transistors: contact resistance as a function of gate voltage and temperature. J. Appl. Phys. 96(12), 7312 (2004)
Pivrikas, A., Juska, G., Arlauskas, K., Scharber, M., Mozer, A., Sariciftci, N.S., Stubb, H., Österbacka, R.: Charge carrier transport and recombination in bulk-heterojunction solar cells Organic Photovoltaics VI. In: Kafafi, Z.H., Lane, P.A. (eds.) Proceedings of SPIE 5938, 59380N (2005)
Podzorov V., Sysoev S.E., Loginova E., Pudalov V.M., Gershenson M.E.: Single-crystal organic field effect transistors with the hole mobility ~8 cm 2/V s. Appl. Phys. Lett. 83(17), 3504 (2003)
Poplavskyy D., Nelson J.: Nondispersive hole transport in amorphous films of methoxy-spirofluorene-arylamine organic compound. J. Appl. Phys. 93, 341 (2003)
Prins P., Candeias L.P., van Breemen A.J.M., Sweelssen J., Herwig P.T., Schoo H.F.M., Siebbeles L.D.A.: Electron and hole dynamics on isolated chains of a solution-processable poly(thienylenevinylene) derivative in dilute solution. Adv. Mater. 17, 718 (2005)
Prins P., Grozema F.C., Schins J.M., Savenije T.J., Patil S., Scherf U., Siebbeles U.: Effect of intermolecular disorder on the intrachain charge transport in ladder-type poly(p-phenylenes). Phys. Rev. B 73, 045204 (2006)
Pucel R.A., Krumm C.F.: Simple method of measuring drift mobility profiles in thin semiconductor films. Electron. Lett. 12, 240–242 (1976)
Redecker M., Bässler H., Hörhold H.H.: Determination of the hole mobility in organic light-emitting diodes via transient absorption. J. Phys. Chem. B 101, 7398 (1997)
Roichman Y., Tessler N.: Synth. Met. 135, 443 (2003)
Roldan J.B., Gamiz F., Lopez-Villanueva J.A.: IEEE Trans. Electron Devices 44, 1447 (1997)
Saragi T.P.I., Fuhrmann-Lieker T., Salbeck J.: Comparison of charge-carrier transport in thin films of spiro-linked compounds and their corresponding parent compounds. Adv. Funct. Mater. 16(7), 966–974 (2006)
Scher H., Montroll E.W.: Anomalous transit-time dispersion in amorphous solids. Phys. Rev. B 12, 2455 (1975)
Schouten P.G., Warman J.M., de Haas M.P.: Effect of accumulated radiation dose on pulse radiolysis conductivity transients in a mesomorphic octa-n-alkoxy-substituted phthalocyanine. J. Phys. Chem. 97, 9863 (1993)
Shirota Y., Okumoto K., Ohishi H., Tanaka M., Nakao M., Wayaku K., Nomura S., Kageyama H.: Charge transport in amorphous molecular materials. Proceedings of SPIE-International Society Optical Engineering 5937, 593717 (2005)
Sirringhaus H., Brown P.J., Friend R.H., Nielsen M.M., Bechgaard K., Langeveld-Voss B.M.W., Spiering A.J.H., Janssen R.A.J., Meijer E.W.: Microstructure-mobility correlation in self-organized, conjugated polymer field-effect transistors. Synth. Met. 111–112, 129 (2000)
Stallinga P., Benvenho A.R.V., Smits E.C.P., Mathijssen S.G.J., Cölle M., Gomes H.L., de Leeuw D.M.: Determining carrier mobility with a metal–insulator–semiconductor structure. Org. Electron. 9, 735–739 (2008)
Stassen A.F., de Boer R.W.I., Iosad N.N., Morpurgo A.F.: Influence of the gate dielectric on the mobility of rubrene single-crystal field-effect transistors. Appl. Phys. Lett. 85(17), 3899 (2004)
Su W.P., Schrieffer J.R., Heeger A.J.: Solitons in polyacetylene. Phys. Rev. Lett. 42, 1698–1701 (1979)
Sze S.M.: Physics of Semiconductor Devices. 2nd edn. Wiley, New York (1981)
Tanase C., Meijer E.J., Blom P.W.M., de Leeuw D.M.: Unification of the hole transport in polymeric field-effect transistors and light-emitting diodes. Phys. Rev. Lett. 91, 216601 (2003)
Tse S.C., Fong S.C., So S.K.: Electron transit time and reliable mobility measurements from thick film hydroxyquinoline-based organic light-emitting diode. J. Appl. Phys. 94, 2033 (2003)
Tse S.C., Tsang S.W., So S.K.: Polymeric conducting anode for small organic transporting molecules in dark injection experiments. J. Appl. Phys. 100, 063708 (2006)
van de Craats A.M., Warman J.M.: The core-size effect on the mobility of charge in discotic liquid crystalline materials. Adv. Mater. 13(2), 130–133 (2001)
Veres J., Ogier S.D., Leeming S.W., Cupertino D.C., Khaffaf S.M.: Low-k insulators as the choice of dielec- trics in organic field-effect transistors. Adv. Funct. Mater. 13, 199 (2003)
Warman, J.M., de Haas, M.P., Dicker, G., Grozema, F.C., Piris, J., Debije, M.G.: Charge mobilities in organic semiconductingmaterials determined by pulse-radiolysis time-resolved microwave conductivity: π-bond-conjugated polymers versus π − π-stacked discotics. Chem. Mater. 16, 4600 (2004)
Wong T.C., Kovac J., Lee C.S., Hung L.S., Lee S.T.: Transient electroluminescence measurements on electron-mobility of N-arylbenzimidazoles. Chem. Phys. Lett. 334, 61 (2001)
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Tiwari, S., Greenham, N.C. Charge mobility measurement techniques in organic semiconductors. Opt Quant Electron 41, 69–89 (2009). https://doi.org/10.1007/s11082-009-9323-0
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DOI: https://doi.org/10.1007/s11082-009-9323-0