Dependence of Mobility on Density of Gap States in Organics by GAMEaS - Gate Modulated Activation Energy Spectroscopy

2) ((1) Columbia University; (2) Bell Laboratories; (3) Los Alamos National Laboratory); A. P. Ramirez (1; D. V. Lang (1); J. C. Lashley (3); V. Y. Butko (3); W. So (1); X. Chi (1)

arxiv: cond-mat/0608687 · v2 · submitted 2006-08-30 · ❄️ cond-mat.mtrl-sci · cond-mat.soft

Dependence of Mobility on Density of Gap States in Organics by GAMEaS - Gate Modulated Activation Energy Spectroscopy

W. So (1) , D. V. Lang (1) , V. Y. Butko (3) , X. Chi (1) , J. C. Lashley (3) , A. P. Ramirez (1 , 2) ((1) Columbia University , (2) Bell Laboratories

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(3) Los Alamos National Laboratory)

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classification ❄️ cond-mat.mtrl-sci cond-mat.soft

keywords energygameasmobilityactivationcrystaldensityeffectfield

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We develop a broadly applicable transport-based technique, GAte Modulated activation Energy Spectroscopy (GAMEaS), for determining the density of states (DOS) in the energy gap. GAMEaS is applied to field effect transistors made from different single crystal oligomer semiconductors to extract the free-carrier mobility, u_0, from the field effect mobility, u_eff. Samples with a lower DOS exhibit higher u_eff. Values of u_0 up to 100 +/- 40 cm2/Vs at 300K are observed, showing that performance can be greatly enhanced by improving sample purity and crystal quality.

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Dependence of Mobility on Density of Gap States in Organics by GAMEaS - Gate Modulated Activation Energy Spectroscopy

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