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Large work function shift of organic semiconductors inducing enhanced interfacial electron transfer in organic optoelectronics enabled by porphyrin aggregated nanostructures

Large work function shift of organic semiconductors inducing enhanced interfacial electron transfer in organic optoelectronics enabled by porphyrin aggregated nanostructures
Large work function shift of organic semiconductors inducing enhanced interfacial electron transfer in organic optoelectronics enabled by porphyrin aggregated nanostructures

We report on large work function shifts induced by the coverage of several organic semiconducting (OSC) films commonly used in organic light emitting diodes (OLEDs) and organic photovoltaics (OPVs) with a porphyrin aggregated layer. The insertion between the organic film and the aluminum cathode of an aggregated layer based on the meso-tetrakis(1-methylpyridinium-4-yl) porphyrin chloride (porphyrin 1), with its molecules adopting a face-to-face orientation parallel to the organic substrate, results in a significant shift of the OSC work function towards lower values due to the formation of a large interfacial dipole and induces large enhancement of either the OLED or OPV device efficiency. OLEDs based on poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-2,1′,3-thiadiazole)] (F8BT) and incorporating the porphyrin 1 at the cathode interface exhibited current efficiency values up to 13.8 cd/A, an almost three-fold improvement over the efficiency of 4.5 cd/A of the reference device. Accordingly, OPVs based on poly(3-hexylthiophene) (P3HT), [6,6]-phenyl-C61 butyric acid methyl ester (PC61BM) and porphyrin 1 increased their external quantum efficiencies to 4.4% relative to 2.7% for the reference device without the porphyrin layer. The incorporation of a layer based on the zinc meso-tetrakis (1-methylpyridinium-4-yl)porphyrin chloride (porphyrin 2), with its molecules adopting an edge-to-edge orientation, also introduced improvements, albeit more modest in all cases, highlighting the impact of molecular orientation. [Figure not available: see fulltext.]

aggregates, OLEDs, OPVs, porphyrins
1998-0124
679-693
Vasilopoulou, Maria
aad1381e-d091-4090-8c7c-b74bed22393d
Douvas, Antonios M.
2e088659-e1b3-4723-aff9-4dfe385579b5
Georgiadou, Dimitra G.
84977176-3678-4fb3-a3dd-2044a49c853b
Constantoudis, Vassilios
4d35166b-4d75-4caa-ae27-c991b51a01c3
Davazoglou, Dimitris
a946cf5d-287a-4734-ba55-b180ab4525ed
Kennou, Stella
7ca6a6bd-6a05-4110-b3da-c8807f798370
Palilis, Leonidas C.
b09e9554-54da-4be5-aa08-bda894e2b86f
Daphnomili, Dimitra
f20e5adb-aa1a-4d34-975d-34025ac594be
Coutsolelos, Athanassios G.
ee1dc69e-5f00-4f79-9eb5-e5dd741fc99f
Argitis, Panagiotis
ab9c4ea6-3dd2-4e34-935d-81bfb360f358
Vasilopoulou, Maria
aad1381e-d091-4090-8c7c-b74bed22393d
Douvas, Antonios M.
2e088659-e1b3-4723-aff9-4dfe385579b5
Georgiadou, Dimitra G.
84977176-3678-4fb3-a3dd-2044a49c853b
Constantoudis, Vassilios
4d35166b-4d75-4caa-ae27-c991b51a01c3
Davazoglou, Dimitris
a946cf5d-287a-4734-ba55-b180ab4525ed
Kennou, Stella
7ca6a6bd-6a05-4110-b3da-c8807f798370
Palilis, Leonidas C.
b09e9554-54da-4be5-aa08-bda894e2b86f
Daphnomili, Dimitra
f20e5adb-aa1a-4d34-975d-34025ac594be
Coutsolelos, Athanassios G.
ee1dc69e-5f00-4f79-9eb5-e5dd741fc99f
Argitis, Panagiotis
ab9c4ea6-3dd2-4e34-935d-81bfb360f358

Vasilopoulou, Maria, Douvas, Antonios M., Georgiadou, Dimitra G., Constantoudis, Vassilios, Davazoglou, Dimitris, Kennou, Stella, Palilis, Leonidas C., Daphnomili, Dimitra, Coutsolelos, Athanassios G. and Argitis, Panagiotis (2014) Large work function shift of organic semiconductors inducing enhanced interfacial electron transfer in organic optoelectronics enabled by porphyrin aggregated nanostructures. Nano Research, 7 (5), 679-693. (doi:10.1007/s12274-014-0428-9).

Record type: Article

Abstract

We report on large work function shifts induced by the coverage of several organic semiconducting (OSC) films commonly used in organic light emitting diodes (OLEDs) and organic photovoltaics (OPVs) with a porphyrin aggregated layer. The insertion between the organic film and the aluminum cathode of an aggregated layer based on the meso-tetrakis(1-methylpyridinium-4-yl) porphyrin chloride (porphyrin 1), with its molecules adopting a face-to-face orientation parallel to the organic substrate, results in a significant shift of the OSC work function towards lower values due to the formation of a large interfacial dipole and induces large enhancement of either the OLED or OPV device efficiency. OLEDs based on poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-2,1′,3-thiadiazole)] (F8BT) and incorporating the porphyrin 1 at the cathode interface exhibited current efficiency values up to 13.8 cd/A, an almost three-fold improvement over the efficiency of 4.5 cd/A of the reference device. Accordingly, OPVs based on poly(3-hexylthiophene) (P3HT), [6,6]-phenyl-C61 butyric acid methyl ester (PC61BM) and porphyrin 1 increased their external quantum efficiencies to 4.4% relative to 2.7% for the reference device without the porphyrin layer. The incorporation of a layer based on the zinc meso-tetrakis (1-methylpyridinium-4-yl)porphyrin chloride (porphyrin 2), with its molecules adopting an edge-to-edge orientation, also introduced improvements, albeit more modest in all cases, highlighting the impact of molecular orientation. [Figure not available: see fulltext.]

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More information

Accepted/In Press date: 9 February 2014
e-pub ahead of print date: 27 March 2014
Keywords: aggregates, OLEDs, OPVs, porphyrins

Identifiers

Local EPrints ID: 440495
URI: http://eprints.soton.ac.uk/id/eprint/440495
ISSN: 1998-0124
PURE UUID: 9d32dc53-414f-4354-94ec-395fddf6cc36
ORCID for Dimitra G. Georgiadou: ORCID iD orcid.org/0000-0002-2620-3346

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Date deposited: 05 May 2020 16:42
Last modified: 07 Oct 2020 02:27

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Contributors

Author: Maria Vasilopoulou
Author: Antonios M. Douvas
Author: Vassilios Constantoudis
Author: Dimitris Davazoglou
Author: Stella Kennou
Author: Leonidas C. Palilis
Author: Dimitra Daphnomili
Author: Athanassios G. Coutsolelos
Author: Panagiotis Argitis

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