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N-doping of pentacene by decamethylcobaltocene
Authors:Calvin K. Chan and Antoine Kahn
Affiliation:(1) Dept. of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA
Abstract:We demonstrate n-type doping of pentacene with the powerful reducing molecule decamethylcobaltocene (CoCp2*). Characterization of pentacene films deposited in a background pressure of CoCp2* by X-ray photoemission spectroscopy and Rutherford backscattering confirm that the concentration of incorporated donor molecules can be controlled to a level as high as 1%. Ultraviolet photoemission spectroscopy show Fermi level (E F) shifts toward unoccupied pentacene states, indicative of an increase in the electron concentration. A 1% donor incorporation level brings E F to 0.6 eV below the pentacene lowest unoccupied molecular orbital. The corresponding electron density of ∼1018 cm−3 is confirmed by capacitance–voltage measurements on a metal–pentacene–oxide–silicon structure. The demonstration of n-doping suggests applications of CoCp2* to pentacene contacts or channel regions of pentacene OTFTs.
Keywords:  KeywordHeading"  >PACS 68.55.Ln  79.60.Fr  73.61.Ph
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