Electroabsorption studies of structurally modified fullerene thin films

G. F. Farrell; G. Chambers; H. J. Byrne

doi:10.1117/12.598747

Electroabsorption studies of structurally modified fullerene thin films

Research output: Contribution to journal › Conference article › peer-review

Abstract

Ultraviolet (UV/Vis) and Electroabsorption (EA) spectroscopy is used to examine and differentiate between intermolecular and intra molecular excited state species in fullerene films. Charge Transfer (CT) states are identified at 2.4 eV and 2.7 eV and dipole moments are calculated. Thermal annealing of C ₆₀ films is monitored in situ using absorption spectroscopy and electroabsorption spectroscopy. Recorded spectra display both some temperature dependent and partially irreversible effects, indicating the occurrence of an annealing process. EA shows that the CT states associated with the transferring an electron from the HOMO of one molecule located at the (0,0,0) position to the LUMO of its nearest neighbour in the (1/2,1/2,0) have been modified as a result of the annealing process. Confirmation of this structural change due to the annealing process is provided by previously reported X-Ray crystallographic work.

Original language	English
Article number	28
Pages (from-to)	232-241
Number of pages	10
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	5826
DOIs	https://doi.org/10.1117/12.598747
Publication status	Published - 2005
Event	Opto-Ireland 2005: Optical Sensing and Spectroscopy - Dublin, Ireland Duration: 4 Apr 2005 → 6 Apr 2005

Keywords

Annealing
Electroabsorption
Fullerenes
Lattice Structure

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10.1117/12.598747

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title = "Electroabsorption studies of structurally modified fullerene thin films",

abstract = "Ultraviolet (UV/Vis) and Electroabsorption (EA) spectroscopy is used to examine and differentiate between intermolecular and intra molecular excited state species in fullerene films. Charge Transfer (CT) states are identified at 2.4 eV and 2.7 eV and dipole moments are calculated. Thermal annealing of C 60 films is monitored in situ using absorption spectroscopy and electroabsorption spectroscopy. Recorded spectra display both some temperature dependent and partially irreversible effects, indicating the occurrence of an annealing process. EA shows that the CT states associated with the transferring an electron from the HOMO of one molecule located at the (0,0,0) position to the LUMO of its nearest neighbour in the (1/2,1/2,0) have been modified as a result of the annealing process. Confirmation of this structural change due to the annealing process is provided by previously reported X-Ray crystallographic work.",

keywords = "Annealing, Electroabsorption, Fullerenes, Lattice Structure",

author = "Farrell, {G. F.} and G. Chambers and Byrne, {H. J.}",

note = "Funding Information: FOCAS is funded under the National Development Plan 2000-2006 with assistance from the European Regional Development Fund.; Opto-Ireland 2005: Optical Sensing and Spectroscopy ; Conference date: 04-04-2005 Through 06-04-2005",

year = "2005",

doi = "10.1117/12.598747",

language = "English",

volume = "5826",

pages = "232--241",

journal = "Proceedings of SPIE - The International Society for Optical Engineering",

issn = "0277-786X",

publisher = "SPIE",

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TY - JOUR

T1 - Electroabsorption studies of structurally modified fullerene thin films

AU - Farrell, G. F.

AU - Chambers, G.

AU - Byrne, H. J.

N1 - Funding Information: FOCAS is funded under the National Development Plan 2000-2006 with assistance from the European Regional Development Fund.

PY - 2005

Y1 - 2005

N2 - Ultraviolet (UV/Vis) and Electroabsorption (EA) spectroscopy is used to examine and differentiate between intermolecular and intra molecular excited state species in fullerene films. Charge Transfer (CT) states are identified at 2.4 eV and 2.7 eV and dipole moments are calculated. Thermal annealing of C 60 films is monitored in situ using absorption spectroscopy and electroabsorption spectroscopy. Recorded spectra display both some temperature dependent and partially irreversible effects, indicating the occurrence of an annealing process. EA shows that the CT states associated with the transferring an electron from the HOMO of one molecule located at the (0,0,0) position to the LUMO of its nearest neighbour in the (1/2,1/2,0) have been modified as a result of the annealing process. Confirmation of this structural change due to the annealing process is provided by previously reported X-Ray crystallographic work.

AB - Ultraviolet (UV/Vis) and Electroabsorption (EA) spectroscopy is used to examine and differentiate between intermolecular and intra molecular excited state species in fullerene films. Charge Transfer (CT) states are identified at 2.4 eV and 2.7 eV and dipole moments are calculated. Thermal annealing of C 60 films is monitored in situ using absorption spectroscopy and electroabsorption spectroscopy. Recorded spectra display both some temperature dependent and partially irreversible effects, indicating the occurrence of an annealing process. EA shows that the CT states associated with the transferring an electron from the HOMO of one molecule located at the (0,0,0) position to the LUMO of its nearest neighbour in the (1/2,1/2,0) have been modified as a result of the annealing process. Confirmation of this structural change due to the annealing process is provided by previously reported X-Ray crystallographic work.

KW - Annealing

KW - Electroabsorption

KW - Fullerenes

KW - Lattice Structure

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U2 - 10.1117/12.598747

DO - 10.1117/12.598747

M3 - Conference article

AN - SCOPUS:27644452549

SN - 0277-786X

VL - 5826

SP - 232

EP - 241

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

M1 - 28

T2 - Opto-Ireland 2005: Optical Sensing and Spectroscopy

Y2 - 4 April 2005 through 6 April 2005

ER -

Electroabsorption studies of structurally modified fullerene thin films

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Keywords

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