Low level optical absorption measurements on organic semiconductors

M. Stella; C. Voz; J. Puigdollers; F. Rojas; M. Fonrodona; J. Escarré; J. M. Asensi; J. Bertomeu; J. Andreu

doi:10.1016/j.jnoncrysol.2005.09.048

Low level optical absorption measurements on organic semiconductors

M. Stella, C. Voz, J. Puigdollers, F. Rojas, M. Fonrodona, J. Escarré, J. M. Asensi, J. Bertomeu, J. Andreu

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

The optical absorption of n-type (C₆₀ and PTCDA) and p-type (CuPc and pentacene) organic semiconductors is investigated by optical transmission and photothermal deflection spectroscopy. The usual absorption bands related to HOMO-LUMO transitions are observed in the high absorption region of transmission spectra. Photothermal deflection spectroscopy also evidences exponential absorption shoulders with characteristic energies 47 meV for CuPc, 38 meV for pentacene, 50 meV for PTCDA and 87 meV for C₆₀. In addition, broad bands in the low absorption level are observed for C₆₀ and PTCDA. These bands have been attributed to contamination due to air exposure. On the other hand, in CuPc a clear absorption peak at 1.12 eV is observed with smaller features at 1.04 eV, 1.20 eV and 1.33 eV. These peaks are attributed to transitions between the Pc levels of CuPc ions. Finally, the optical absorption expected in blends of organic semiconductors is estimated by an effective media approximation.

Original language	English
Pages (from-to)	1663-1667
Number of pages	5
Journal	Journal of Non-Crystalline Solids
Volume	352
Issue number	9-20 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jnoncrysol.2005.09.048
State	Published - 15 Jun 2006
Externally published	Yes

Keywords

Absorption
Optical microscopy
Polymers and organics
Solar cells

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10.1016/j.jnoncrysol.2005.09.048

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@article{f22d9c4d9bed43aeab5ea44c0d004f4d,

title = "Low level optical absorption measurements on organic semiconductors",

abstract = "The optical absorption of n-type (C60 and PTCDA) and p-type (CuPc and pentacene) organic semiconductors is investigated by optical transmission and photothermal deflection spectroscopy. The usual absorption bands related to HOMO-LUMO transitions are observed in the high absorption region of transmission spectra. Photothermal deflection spectroscopy also evidences exponential absorption shoulders with characteristic energies 47 meV for CuPc, 38 meV for pentacene, 50 meV for PTCDA and 87 meV for C60. In addition, broad bands in the low absorption level are observed for C60 and PTCDA. These bands have been attributed to contamination due to air exposure. On the other hand, in CuPc a clear absorption peak at 1.12 eV is observed with smaller features at 1.04 eV, 1.20 eV and 1.33 eV. These peaks are attributed to transitions between the Pc levels of CuPc ions. Finally, the optical absorption expected in blends of organic semiconductors is estimated by an effective media approximation.",

keywords = "Absorption, Optical microscopy, Polymers and organics, Solar cells",

author = "M. Stella and C. Voz and J. Puigdollers and F. Rojas and M. Fonrodona and J. Escarr{\'e} and Asensi, {J. M.} and J. Bertomeu and J. Andreu",

note = "Funding Information: This work was developed in the framework of CerMAE of the Generalitat de Catalunya. It has been also supported by the CICYT of the Spanish Government under programs ENE2004-07376-C03-01, MAT2002-04263 and TIC2002-04184. M.F. acknowledges the support of the Program Juan de la Cierva of the Spanish Ministry of Science and Technology.",

year = "2006",

month = jun,

day = "15",

doi = "10.1016/j.jnoncrysol.2005.09.048",

language = "English",

volume = "352",

pages = "1663--1667",

journal = "Journal of Non-Crystalline Solids",

issn = "0022-3093",

publisher = "Elsevier B.V.",

number = "9-20 SPEC. ISS.",

}

TY - JOUR

T1 - Low level optical absorption measurements on organic semiconductors

AU - Stella, M.

AU - Voz, C.

AU - Puigdollers, J.

AU - Rojas, F.

AU - Fonrodona, M.

AU - Escarré, J.

AU - Asensi, J. M.

AU - Bertomeu, J.

AU - Andreu, J.

N1 - Funding Information: This work was developed in the framework of CerMAE of the Generalitat de Catalunya. It has been also supported by the CICYT of the Spanish Government under programs ENE2004-07376-C03-01, MAT2002-04263 and TIC2002-04184. M.F. acknowledges the support of the Program Juan de la Cierva of the Spanish Ministry of Science and Technology.

PY - 2006/6/15

Y1 - 2006/6/15

N2 - The optical absorption of n-type (C60 and PTCDA) and p-type (CuPc and pentacene) organic semiconductors is investigated by optical transmission and photothermal deflection spectroscopy. The usual absorption bands related to HOMO-LUMO transitions are observed in the high absorption region of transmission spectra. Photothermal deflection spectroscopy also evidences exponential absorption shoulders with characteristic energies 47 meV for CuPc, 38 meV for pentacene, 50 meV for PTCDA and 87 meV for C60. In addition, broad bands in the low absorption level are observed for C60 and PTCDA. These bands have been attributed to contamination due to air exposure. On the other hand, in CuPc a clear absorption peak at 1.12 eV is observed with smaller features at 1.04 eV, 1.20 eV and 1.33 eV. These peaks are attributed to transitions between the Pc levels of CuPc ions. Finally, the optical absorption expected in blends of organic semiconductors is estimated by an effective media approximation.

AB - The optical absorption of n-type (C60 and PTCDA) and p-type (CuPc and pentacene) organic semiconductors is investigated by optical transmission and photothermal deflection spectroscopy. The usual absorption bands related to HOMO-LUMO transitions are observed in the high absorption region of transmission spectra. Photothermal deflection spectroscopy also evidences exponential absorption shoulders with characteristic energies 47 meV for CuPc, 38 meV for pentacene, 50 meV for PTCDA and 87 meV for C60. In addition, broad bands in the low absorption level are observed for C60 and PTCDA. These bands have been attributed to contamination due to air exposure. On the other hand, in CuPc a clear absorption peak at 1.12 eV is observed with smaller features at 1.04 eV, 1.20 eV and 1.33 eV. These peaks are attributed to transitions between the Pc levels of CuPc ions. Finally, the optical absorption expected in blends of organic semiconductors is estimated by an effective media approximation.

KW - Absorption

KW - Optical microscopy

KW - Polymers and organics

KW - Solar cells

UR - http://www.scopus.com/inward/record.url?scp=33745450039&partnerID=8YFLogxK

U2 - 10.1016/j.jnoncrysol.2005.09.048

DO - 10.1016/j.jnoncrysol.2005.09.048

M3 - Article

AN - SCOPUS:33745450039

SN - 0022-3093

VL - 352

SP - 1663

EP - 1667

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

IS - 9-20 SPEC. ISS.

ER -

Low level optical absorption measurements on organic semiconductors

Abstract

Keywords

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