Lookup NU author(s): Dr Jon Goss
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The transport and optical band gaps for the organic semiconductor tin (II) phthalocyanine (SnPc) and the complete energy band profiles have been determined for organic-inorganic interfaces between SnPc and III-V semiconductors. High throughput measurement of interface energetics over timescales comparable to the growth rates was enabled using in situ and real-time photoelectron spectroscopy combined with Organic Molecular Beam Deposition. Energy band alignment at SnPc interfaces with GaAs, GaP, and InP yields interface dipoles varying from -0.08 (GaP) to -0.83 eV (GaAs). Optical and transport gaps for SnPc and CuPc were determined from photoelectron spectroscopy and from optical absorption using spectroscopic ellipsometry to complete the energy band profiles. For SnPc, the difference in energy between the optical and transport gaps indicates an exciton binding energy of (0.6 +/- 0.3) eV. (C) 2013 AIP Publishing LLC.
Author(s): Evans DA, Vearey-Roberts AR, Roberts OR, Williams GT, Cooil SP, Langstaff DP, Cabailh G, McGovern IT, Goss JP
Publication type: Article
Publication status: Published
Journal: Journal of Applied Physics
Print publication date: 28/09/2013
Online publication date: 26/09/2013
Acceptance date: 12/09/2013
ISSN (print): 0021-8979
ISSN (electronic): 1089-7550
Publisher: AIP Publishing LLC
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