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9 Apr 2012

Volume 100, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 100, 153701 (2012); http://dx.doi.org/10.1063/1.3700446 (3 pages)

Hsiao-lu D. Lee, Steffen J. Sahl, Matthew D. Lew, and W. E. Moerner
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Correlation between near infrared-visible absorption, intrinsic local and global sheet resistance of poly(3,4-ethylenedioxy-thiophene) poly(styrene sulfonate) thin films

Felix Herrmann, Sebastian Engmann, Martin Presselt, Harald Hoppe, Sviatoslav Shokhovets, and Gerhard Gobsch

Appl. Phys. Lett. 100, 153301 (2012); http://dx.doi.org/10.1063/1.3697402 (3 pages) | Cited 2 times

Online Publication Date: 9 April 2012

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The ordinary dielectric function of poly(3,4-ethylenedioxy-thiophene) poly(styrene sulfonate) (PEDOT:PSS) thin films was measured using a combination of spectroscopic ellipsometry and photothermal deflection spectroscopy. This method combination allows for a highly sensitive optical characterization of thin films. Hence, even the detection of weak sub-bandgap and intra-band absorptions is enabled. These intraband transitions of free charge carriers were modeled using a Drude-type oscillator to derive an intrinsic resistances for PEDOT:PSS. These optically derived resistances were compared with those determined by a 4-probe measurement setup for two different types of PEDOT:PSS and for varied annealing temperatures. Good agreement between optical and electrical measurements could be obtained for annealing temperatures smaller than 180∘C. Therefore, we conclude that the proposed combination of our two optical methods is well suited to determine electrical resistances of organic layers.
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78.66.Qn Polymers; organic compounds
73.61.Ph Polymers; organic compounds
78.30.Jw Organic compounds, polymers
78.40.Fy Semiconductors
78.40.Me Organic compounds and polymers
78.40.Pg Disordered solids
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Charge carrier velocity distributions in high mobility polymer field-effect transistors

Tae-Jun Ha, Prashant Sonar, and Ananth Dodabalapur

Appl. Phys. Lett. 100, 153302 (2012); http://dx.doi.org/10.1063/1.3697994 (4 pages) | Cited 4 times

Online Publication Date: 12 April 2012

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In this letter, the velocity distributions of charge carriers in high-mobility polymer thin-film transistors (TFTs) with a diketopyrrolopyrrole-naphthalene copolymer (PDPP-TNT) semiconductor active layer are reported. The velocity distributions are found to be strongly dependent on measurement temperatures as well as annealing conditions. Considerable inhomogeneity is evident at low measurement temperatures and for low annealing temperatures. Such transient transport measurements can provide additional information about charge carrier transport in TFTs which are unavailable using steady-state transport measurements.
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85.30.Tv Field effect devices
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Excitation dynamics of a low bandgap silicon-bridged dithiophene copolymer and its composites with fullerenes

Andreas Othonos, Grigorios Itskos, Marios Neophytou, and Stelios A. Choulis

Appl. Phys. Lett. 100, 153303 (2012); http://dx.doi.org/10.1063/1.3703601 (4 pages)

Online Publication Date: 12 April 2012

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We report on excitation dynamics in pristine and bulk heterojunction films of the low bandgap silicon-bridged dithiophene copolymer poly[(4,4′-bis(2-ethylhexyl)dithieno[3,2-b:2′, 3′-d]silole)-2,6-diyl-alt-(4,7-bis(2-thienyl)-2,1,3-benzothiadiazole)-5,5′-diyl] with methanofullerene derivatives. The combination of ultrafast transient transmission and photoluminescence allows us to probe the relaxation of both exciton and polaron states in a relatively wide spectral and temporal range. Measurements reveal that the majority of excitations undergo ultrashort non-radiative relaxation while a small fraction of the photoexcited species decays slowly within hundreds of ps. In the blend films, significantly longer decays are observed suggesting the presence of long lived holes and/or charged-transfer type of excitons.
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78.66.Qn Polymers; organic compounds
61.25.hk Polymer melts and blends
71.38.-k Polarons and electron-phonon interactions
71.35.-y Excitons and related phenomena
71.20.Rv Polymers and organic compounds
78.55.Kz Solid organic materials
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