Interface formation between poly(9,9-dioctylfluorene) and Ca electrode investigated using photoelectron spectroscopy

L. S. Liao; L. F. Cheng; M. K. Fung; C. S. Lee; S. T. Lee; M. Inbasekaran; E. P. Woo; W. W. Wu

doi:10.1016/S0009-2614(00)00722-3

Interface formation between poly(9,9-dioctylfluorene) and Ca electrode investigated using photoelectron spectroscopy

L. S. Liao, L. F. Cheng, M. K. Fung, C. S. Lee, S. T. Lee, M. Inbasekaran, E. P. Woo, W. W. Wu

Centre of Super-Diamond and Advanced Films

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

33 Citations (Scopus)

Abstract

Ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy (XPS) have been used to study the interface formation between poly(9,9-dioctylfluorene) (PFO) and Ca electrode. As the Ca coverage increases, the vacuum energy level of PFO decreases gradually in order to match the Fermi level (E_F) of Ca. The original highest occupied molecular orbital of PFO moves away from the E_F, and vanishes eventually. Bipolaron states with 1.8 eV in peak interval are formed in the former energy gap. The original lowest occupied molecular orbitals of PFO are broadened resulting in a featureless shake-up in the XPS C1s core level.

Original language	English
Pages (from-to)	405-410
Journal	Chemical Physics Letters
Volume	325
Issue number	4
DOIs	https://doi.org/10.1016/S0009-2614(00)00722-3
Publication status	Published - 28 Jul 2000

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title = "Interface formation between poly(9,9-dioctylfluorene) and Ca electrode investigated using photoelectron spectroscopy",

abstract = "Ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy (XPS) have been used to study the interface formation between poly(9,9-dioctylfluorene) (PFO) and Ca electrode. As the Ca coverage increases, the vacuum energy level of PFO decreases gradually in order to match the Fermi level (EF) of Ca. The original highest occupied molecular orbital of PFO moves away from the EF, and vanishes eventually. Bipolaron states with 1.8 eV in peak interval are formed in the former energy gap. The original lowest occupied molecular orbitals of PFO are broadened resulting in a featureless shake-up in the XPS C1s core level.",

author = "Liao, {L. S.} and Cheng, {L. F.} and Fung, {M. K.} and Lee, {C. S.} and Lee, {S. T.} and M. Inbasekaran and Woo, {E. P.} and Wu, {W. W.}",

year = "2000",

month = jul,

day = "28",

doi = "10.1016/S0009-2614(00)00722-3",

language = "English",

volume = "325",

pages = "405--410",

journal = "Chemical Physics Letters",

issn = "0009-2614",

publisher = "Elsevier B.V.",

number = "4",

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TY - JOUR

T1 - Interface formation between poly(9,9-dioctylfluorene) and Ca electrode investigated using photoelectron spectroscopy

AU - Liao, L. S.

AU - Cheng, L. F.

AU - Fung, M. K.

AU - Lee, C. S.

AU - Lee, S. T.

AU - Inbasekaran, M.

AU - Woo, E. P.

AU - Wu, W. W.

PY - 2000/7/28

Y1 - 2000/7/28

N2 - Ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy (XPS) have been used to study the interface formation between poly(9,9-dioctylfluorene) (PFO) and Ca electrode. As the Ca coverage increases, the vacuum energy level of PFO decreases gradually in order to match the Fermi level (EF) of Ca. The original highest occupied molecular orbital of PFO moves away from the EF, and vanishes eventually. Bipolaron states with 1.8 eV in peak interval are formed in the former energy gap. The original lowest occupied molecular orbitals of PFO are broadened resulting in a featureless shake-up in the XPS C1s core level.

AB - Ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy (XPS) have been used to study the interface formation between poly(9,9-dioctylfluorene) (PFO) and Ca electrode. As the Ca coverage increases, the vacuum energy level of PFO decreases gradually in order to match the Fermi level (EF) of Ca. The original highest occupied molecular orbital of PFO moves away from the EF, and vanishes eventually. Bipolaron states with 1.8 eV in peak interval are formed in the former energy gap. The original lowest occupied molecular orbitals of PFO are broadened resulting in a featureless shake-up in the XPS C1s core level.

UR - http://www.scopus.com/inward/record.url?scp=0000071921&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-0000071921&origin=recordpage

U2 - 10.1016/S0009-2614(00)00722-3

DO - 10.1016/S0009-2614(00)00722-3

M3 - RGC 21 - Publication in refereed journal

SN - 0009-2614

VL - 325

SP - 405

EP - 410

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 4

ER -

Interface formation between poly(9,9-dioctylfluorene) and Ca electrode investigated using photoelectron spectroscopy

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