Interface between poly (9,9-dioctylfluorene) and alkali metals: cesium, potassium, sodium, and lithium

M. K. Fung; S. L. Lai; S. N. Bao; C. S. Lee; S. T. Lee; W. W. Wu; M. Inbasekaran; J. J. O'Brien

doi:10.1116/1.1472419

Interface between poly (9,9-dioctylfluorene) and alkali metals: cesium, potassium, sodium, and lithium

M. K. Fung
, S. L. Lai
, S. N. Bao
, C. S. Lee
, S. T. Lee
, W. W. Wu
, M. Inbasekaran
, J. J. O'Brien

Centre of Super-Diamond and Advanced Films

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

20 Citations (Scopus)

Abstract

The electronic and chemical structures of Cs/PFO, K/PFO, Na/PFO, and Li/PFO interfaces were systematically studied by combined UPS and XPS analysis. It was shown that exposure of films to residual gases at a pressure of 2.0 × 10^-9 mbar for 3 h, or to a small amount of oxygen or water vapor could eliminate the gap states and restore the valence band structures. However, immediate deposition of Ag onto the alkali metal/PFO interface protected the films against residual gases and hence the bipolaron states were retained.

Original language	English
Pages (from-to)	911-918
Journal	Journal of Vacuum Science and Technology, Part A: Vacuum, Surfaces and Films
Volume	20
Issue number	3
DOIs	https://doi.org/10.1116/1.1472419
Publication status	Published - May 2002

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@article{62c02424adeb494597e7178f8a02011a,

title = "Interface between poly (9,9-dioctylfluorene) and alkali metals: cesium, potassium, sodium, and lithium",

abstract = "The electronic and chemical structures of Cs/PFO, K/PFO, Na/PFO, and Li/PFO interfaces were systematically studied by combined UPS and XPS analysis. It was shown that exposure of films to residual gases at a pressure of 2.0 × 10-9 mbar for 3 h, or to a small amount of oxygen or water vapor could eliminate the gap states and restore the valence band structures. However, immediate deposition of Ag onto the alkali metal/PFO interface protected the films against residual gases and hence the bipolaron states were retained.",

author = "Fung, \{M. K.\} and Lai, \{S. L.\} and Bao, \{S. N.\} and Lee, \{C. S.\} and Lee, \{S. T.\} and Wu, \{W. W.\} and M. Inbasekaran and O'Brien, \{J. J.\}",

year = "2002",

month = may,

doi = "10.1116/1.1472419",

language = "English",

volume = "20",

pages = "911--918",

journal = "Journal of Vacuum Science and Technology, Part A: Vacuum, Surfaces and Films",

issn = "0734-2101",

publisher = "AVS Science and Technology Society",

number = "3",

}

Interface between poly (9,9-dioctylfluorene) and alkali metals: cesium, potassium, sodium, and lithium. / Fung, M. K.; Lai, S. L.; Bao, S. N. et al.
In: Journal of Vacuum Science and Technology, Part A: Vacuum, Surfaces and Films, Vol. 20, No. 3, 05.2002, p. 911-918.

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

TY - JOUR

T1 - Interface between poly (9,9-dioctylfluorene) and alkali metals

T2 - cesium, potassium, sodium, and lithium

AU - Fung, M. K.

AU - Lai, S. L.

AU - Bao, S. N.

AU - Lee, C. S.

AU - Lee, S. T.

AU - Wu, W. W.

AU - Inbasekaran, M.

AU - O'Brien, J. J.

PY - 2002/5

Y1 - 2002/5

N2 - The electronic and chemical structures of Cs/PFO, K/PFO, Na/PFO, and Li/PFO interfaces were systematically studied by combined UPS and XPS analysis. It was shown that exposure of films to residual gases at a pressure of 2.0 × 10-9 mbar for 3 h, or to a small amount of oxygen or water vapor could eliminate the gap states and restore the valence band structures. However, immediate deposition of Ag onto the alkali metal/PFO interface protected the films against residual gases and hence the bipolaron states were retained.

AB - The electronic and chemical structures of Cs/PFO, K/PFO, Na/PFO, and Li/PFO interfaces were systematically studied by combined UPS and XPS analysis. It was shown that exposure of films to residual gases at a pressure of 2.0 × 10-9 mbar for 3 h, or to a small amount of oxygen or water vapor could eliminate the gap states and restore the valence band structures. However, immediate deposition of Ag onto the alkali metal/PFO interface protected the films against residual gases and hence the bipolaron states were retained.

UR - https://www.scopus.com/pages/publications/0036565592

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-0036565592&origin=recordpage

U2 - 10.1116/1.1472419

DO - 10.1116/1.1472419

M3 - RGC 21 - Publication in refereed journal

SN - 0734-2101

VL - 20

SP - 911

EP - 918

JO - Journal of Vacuum Science and Technology, Part A: Vacuum, Surfaces and Films

JF - Journal of Vacuum Science and Technology, Part A: Vacuum, Surfaces and Films

IS - 3

ER -

Interface between poly (9,9-dioctylfluorene) and alkali metals: cesium, potassium, sodium, and lithium

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