Organic-​organic interfaces and unoccupied electronic states of thin films of perylene and naphthalene derivatives

Fadhil S. Kamounah, A.S Komolov, Preben Juul Møller, Y. G. Aliaev, E. F. Lazneva, S. Akhremtchik, John Mortensen, Kjeld Schaumburg

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Thin films of N,N′-Bis(benzyl)-3,4,9,10-perylenetetracarboxylic diimide (BPTCDI, Fig. 1b) and N,N′-Bis(benzyl)-1,4,5,8-naphthalenetetracarboxylic diimide (BNTCDI, Fig. 1d) were thermally deposited in UHV on 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA, Fig. 1a) and 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA, Fig. 1c) film surfaces, respectively, in order to form organic–organic interfaces so that molecules constituting the interfacing layers differ by the substituent group. The surface potential and the density of unoccupied electron states (DOUS) located 5–25 eV above the Fermi level (EF) were measured during the film deposition using an incident beam of low-energy electrons according to the total current electron spectroscopy (TCS) method. Analysis of the TCS data allowed us to assign the π( band located 5–7.5 eV above EF for all the four films under study and the higher located σ*1 and σ*2 bands and the splitting within them. In order to perform the analysis the molecules were hypothetically divided into benzene-like, conjugated and non-conjugated fragments that may individually contribute to the peaks in the DOUS bands. It was shown that a non-conjugated fragment would serve for decreasing of the energy corresponding to the σ*1 and σ*2 bands and the sub-bands within them while an addition of a benzene-like fragment would do the opposite. The BPTCDI/PTCDA and BNTCDI/NTCDA interfaces were found non-reacted and a 4.1±0.1 eV work function value for both BPTCDI and BNTCDI films was determined, which is about 0.25 eV lower than the work functions of the PTCDA and the NTCDA films.
OriginalsprogEngelsk
Artikelnummer19
TidsskriftJournal of Molecular Structure: THEOCHEM
Vol/bind744-747
Sider (fra-til)145-149
Antal sider5
ISSN0166-1280
DOI
StatusUdgivet - 2005

Emneord

  • Surface electronic phenomena
  • Electron–solid interaction
  • Electronic band structure
  • Organic–organic semiconductor interfaces
  • Perylene and naphthalene derivatives

Citer dette

Kamounah, Fadhil S. ; Komolov, A.S ; Juul Møller, Preben ; Aliaev, Y. G. ; Lazneva, E. F. ; Akhremtchik, S. ; Mortensen, John ; Schaumburg, Kjeld. / Organic-​organic interfaces and unoccupied electronic states of thin films of perylene and naphthalene derivatives. I: Journal of Molecular Structure: THEOCHEM. 2005 ; Bind 744-747. s. 145-149.
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title = "Organic-​organic interfaces and unoccupied electronic states of thin films of perylene and naphthalene derivatives",
abstract = "Thin films of N,N′-Bis(benzyl)-3,4,9,10-perylenetetracarboxylic diimide (BPTCDI, Fig. 1b) and N,N′-Bis(benzyl)-1,4,5,8-naphthalenetetracarboxylic diimide (BNTCDI, Fig. 1d) were thermally deposited in UHV on 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA, Fig. 1a) and 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA, Fig. 1c) film surfaces, respectively, in order to form organic–organic interfaces so that molecules constituting the interfacing layers differ by the substituent group. The surface potential and the density of unoccupied electron states (DOUS) located 5–25 eV above the Fermi level (EF) were measured during the film deposition using an incident beam of low-energy electrons according to the total current electron spectroscopy (TCS) method. Analysis of the TCS data allowed us to assign the π( band located 5–7.5 eV above EF for all the four films under study and the higher located σ*1 and σ*2 bands and the splitting within them. In order to perform the analysis the molecules were hypothetically divided into benzene-like, conjugated and non-conjugated fragments that may individually contribute to the peaks in the DOUS bands. It was shown that a non-conjugated fragment would serve for decreasing of the energy corresponding to the σ*1 and σ*2 bands and the sub-bands within them while an addition of a benzene-like fragment would do the opposite. The BPTCDI/PTCDA and BNTCDI/NTCDA interfaces were found non-reacted and a 4.1±0.1 eV work function value for both BPTCDI and BNTCDI films was determined, which is about 0.25 eV lower than the work functions of the PTCDA and the NTCDA films.",
keywords = "Surface electronic phenomena, Electron–solid interaction, Electronic band structure, Organic–organic semiconductor interfaces, Perylene and naphthalene derivatives, Surface electronic phenomena, Electron–solid interaction, Electronic band structure, Organic–organic semiconductor interfaces, Perylene and naphthalene derivatives",
author = "Kamounah, {Fadhil S.} and A.S Komolov and {Juul M{\o}ller}, Preben and Aliaev, {Y. G.} and Lazneva, {E. F.} and S. Akhremtchik and John Mortensen and Kjeld Schaumburg",
year = "2005",
doi = "10.1016/j.molstruc.2005.01.047",
language = "English",
volume = "744-747",
pages = "145--149",
journal = "Journal of Molecular Structure: THEOCHEM",
issn = "0166-1280",
publisher = "Elsevier BV",

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Organic-​organic interfaces and unoccupied electronic states of thin films of perylene and naphthalene derivatives. / Kamounah, Fadhil S.; Komolov, A.S; Juul Møller, Preben; Aliaev, Y. G.; Lazneva, E. F.; Akhremtchik, S.; Mortensen, John; Schaumburg, Kjeld.

I: Journal of Molecular Structure: THEOCHEM, Bind 744-747, 19, 2005, s. 145-149.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Organic-​organic interfaces and unoccupied electronic states of thin films of perylene and naphthalene derivatives

AU - Kamounah, Fadhil S.

AU - Komolov, A.S

AU - Juul Møller, Preben

AU - Aliaev, Y. G.

AU - Lazneva, E. F.

AU - Akhremtchik, S.

AU - Mortensen, John

AU - Schaumburg, Kjeld

PY - 2005

Y1 - 2005

N2 - Thin films of N,N′-Bis(benzyl)-3,4,9,10-perylenetetracarboxylic diimide (BPTCDI, Fig. 1b) and N,N′-Bis(benzyl)-1,4,5,8-naphthalenetetracarboxylic diimide (BNTCDI, Fig. 1d) were thermally deposited in UHV on 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA, Fig. 1a) and 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA, Fig. 1c) film surfaces, respectively, in order to form organic–organic interfaces so that molecules constituting the interfacing layers differ by the substituent group. The surface potential and the density of unoccupied electron states (DOUS) located 5–25 eV above the Fermi level (EF) were measured during the film deposition using an incident beam of low-energy electrons according to the total current electron spectroscopy (TCS) method. Analysis of the TCS data allowed us to assign the π( band located 5–7.5 eV above EF for all the four films under study and the higher located σ*1 and σ*2 bands and the splitting within them. In order to perform the analysis the molecules were hypothetically divided into benzene-like, conjugated and non-conjugated fragments that may individually contribute to the peaks in the DOUS bands. It was shown that a non-conjugated fragment would serve for decreasing of the energy corresponding to the σ*1 and σ*2 bands and the sub-bands within them while an addition of a benzene-like fragment would do the opposite. The BPTCDI/PTCDA and BNTCDI/NTCDA interfaces were found non-reacted and a 4.1±0.1 eV work function value for both BPTCDI and BNTCDI films was determined, which is about 0.25 eV lower than the work functions of the PTCDA and the NTCDA films.

AB - Thin films of N,N′-Bis(benzyl)-3,4,9,10-perylenetetracarboxylic diimide (BPTCDI, Fig. 1b) and N,N′-Bis(benzyl)-1,4,5,8-naphthalenetetracarboxylic diimide (BNTCDI, Fig. 1d) were thermally deposited in UHV on 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA, Fig. 1a) and 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA, Fig. 1c) film surfaces, respectively, in order to form organic–organic interfaces so that molecules constituting the interfacing layers differ by the substituent group. The surface potential and the density of unoccupied electron states (DOUS) located 5–25 eV above the Fermi level (EF) were measured during the film deposition using an incident beam of low-energy electrons according to the total current electron spectroscopy (TCS) method. Analysis of the TCS data allowed us to assign the π( band located 5–7.5 eV above EF for all the four films under study and the higher located σ*1 and σ*2 bands and the splitting within them. In order to perform the analysis the molecules were hypothetically divided into benzene-like, conjugated and non-conjugated fragments that may individually contribute to the peaks in the DOUS bands. It was shown that a non-conjugated fragment would serve for decreasing of the energy corresponding to the σ*1 and σ*2 bands and the sub-bands within them while an addition of a benzene-like fragment would do the opposite. The BPTCDI/PTCDA and BNTCDI/NTCDA interfaces were found non-reacted and a 4.1±0.1 eV work function value for both BPTCDI and BNTCDI films was determined, which is about 0.25 eV lower than the work functions of the PTCDA and the NTCDA films.

KW - Surface electronic phenomena

KW - Electron–solid interaction

KW - Electronic band structure

KW - Organic–organic semiconductor interfaces

KW - Perylene and naphthalene derivatives

KW - Surface electronic phenomena

KW - Electron–solid interaction

KW - Electronic band structure

KW - Organic–organic semiconductor interfaces

KW - Perylene and naphthalene derivatives

U2 - 10.1016/j.molstruc.2005.01.047

DO - 10.1016/j.molstruc.2005.01.047

M3 - Journal article

VL - 744-747

SP - 145

EP - 149

JO - Journal of Molecular Structure: THEOCHEM

JF - Journal of Molecular Structure: THEOCHEM

SN - 0166-1280

M1 - 19

ER -