Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevLett.102.096602
Title: Direct evidence for the role of the madelung potential in determining the work function of doped organic semiconductors
Authors: Chia, P.-J. 
Sivaramakrishnan, S. 
Zhou, M. 
Png, R.-Q. 
Chua, L.-L. 
Friend, R.H. 
Ho, P.K.H. 
Issue Date: 2-Mar-2009
Citation: Chia, P.-J., Sivaramakrishnan, S., Zhou, M., Png, R.-Q., Chua, L.-L., Friend, R.H., Ho, P.K.H. (2009-03-02). Direct evidence for the role of the madelung potential in determining the work function of doped organic semiconductors. Physical Review Letters 102 (9) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevLett.102.096602
Abstract: The work function of a model degenerately doped organic semiconductor p-doped poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) can be systematically tuned over an eV-wide range by exchanging excess matrix protons with spectator cations, without altering the organic semiconductor doping level or polaron density. Ultraviolet photoelectron spectroscopy reveals this to arise not from an interface dipole, but from a bulk effect due to a shift in the Madelung potential set up by the local counter- and spectator-ion structure at the polaron sites. Electrostatic modeling of this potential is in agreement with the observed shift in carrier energetics. The spectator cations also cause a systematic shift in electron-phonon coupling and carrier delocalization, as revealed by infrared and Raman phonon modes, and charge-modulated absorption, which can be related to disorder in this potential. © 2009 The American Physical Society.
Source Title: Physical Review Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/75955
ISSN: 00319007
DOI: 10.1103/PhysRevLett.102.096602
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

19
checked on Oct 18, 2018

WEB OF SCIENCETM
Citations

18
checked on Oct 10, 2018

Page view(s)

61
checked on Oct 20, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.