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|Title:||Polarization effects on energy-level alignment at the interfaces of polymer organic semiconductor films|
|Citation:||Zhao, L.-H., Png, R.-Q., Chiam, C.C.H., Guo, H., Zhuo, J.-M., Chua, L.-L., Wee, A.T.S., Ho, P.K.H. (2012-07-30). Polarization effects on energy-level alignment at the interfaces of polymer organic semiconductor films. Applied Physics Letters 101 (5) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.4734502|
|Abstract:||The thickness-dependent evolutions of the Fermi level E F and ionization potential I p of ultrathin films of regioregular poly(3-hexylthiophene) and poly[2,5-bis(3-tetradecylthiophene-2-yl)thieno[3,2-b] thiophene], deposited as edge-on π-stacked lamellae on gold and on p-doped poly(3,4-ethylenedioxythiophene) electrodes, have been measured by ultraviolet photoemission spectroscopy. The I p increases by 0.3 eV on going from a monolayer film to a few-nanometer-thick film. Correspondingly, the E F pinning depth increases from 0.2 eV to 0.5 eV. This valence band bending which occurs for a constant vacuum level can be quantitatively modeled by microelectrostatic self-consistent polarization field calculations that incorporate both substrate and organic semiconductor film effects. The E F pinning to the first monolayer is relatively shallow. © 2012 American Institute of Physics.|
|Source Title:||Applied Physics Letters|
|Appears in Collections:||Staff Publications|
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