Phys. Rev. Lett. 81, 1082–1085 (1998)Direct Determination of the Exciton Binding Energy of Conjugated Polymers Using a Scanning Tunneling MicroscopeReceived 27 February 1998; published in the issue dated 3 August 1998 We report scanning tunneling spectroscopy measurements of the threshold energy for injecting electrons or holes into thin, conjugated polymer films deposited on Au(111) substrates. Combining these results with optical absorption measurements, we estimate an exciton binding energy of Eb = 0.36±0.10eV for poly[(2-methoxy-5-dodecyloxy)-1,4-phenylenevinylene-co-1,4-phenylenevinylene] and Eb = 0.30±0.10eV for poly(9,9'-dioctylfluorene). In addition, we determine the alignment of the electronic levels of the polymers relative to the substrate. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.1082
DOI:
10.1103/PhysRevLett.81.1082
PACS:
73.61.Ph, 71.35.Cc, 71.38.+i, 73.40.Gk
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.