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Enhancing spectral response of organic photodetectors through surface modification of metal oxide electrodes

Enhancing spectral response of organic photodetectors through surface modification of metal oxide electrodes
Enhancing spectral response of organic photodetectors through surface modification of metal oxide electrodes

For bulk heterojunction (BHJ) organic photodetectors (OPDs), it was found that the direct contact between the deposited electrode and the photoactive organic layer leads to severe quenching of excitons. Improved device architectures hence involve the incorporation of charge transport layers, such as metal oxide layers, between electrodes and the active layer, allowing substantially higher internal efficiencies to be achieved. We show here that through appropriate surface modification of the underlying metal oxide layer, i.e. through hydrogen annealing, a novel light trapping scheme for the photoactive layer deposited on top of the metal oxide layer is developed. This is achieved via optimization of polymer morphology and chain alignment in OPD devices through the formation of an extended interfacial hydrogen bonding network acting as nucleation site for enhanced chain alignment within the bulk material.

hydrogen bonding network, metal oxides, organic photodetector, solar absorption
1-4
IEEE Computer Society
Vasilopoulou, M.
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Georgiadou, D. G.
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Soultati, A.
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Papadimitropoulos, G.
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Argitis, P.
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Alexandropoulos, D.
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Vainos, N.
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Politi, C. T.
ded2ed0e-4019-49cc-ad3a-e73954e16574
Kamalakis, T.
62137d43-f51d-40c9-a00d-7f1522e5cabe
Davazoglou, D.
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Vasilopoulou, M.
aad1381e-d091-4090-8c7c-b74bed22393d
Georgiadou, D. G.
84977176-3678-4fb3-a3dd-2044a49c853b
Soultati, A.
75205fde-50fc-473e-ad72-ab0b3c6b2cb9
Papadimitropoulos, G.
b4f1ecba-cc8a-4882-99a5-a29354a9bca7
Argitis, P.
ab9c4ea6-3dd2-4e34-935d-81bfb360f358
Alexandropoulos, D.
5d40cac5-30a4-4577-a2df-f26a8e5390fb
Vainos, N.
7119b61d-73cc-4842-9c1a-b87672d09333
Politi, C. T.
ded2ed0e-4019-49cc-ad3a-e73954e16574
Kamalakis, T.
62137d43-f51d-40c9-a00d-7f1522e5cabe
Davazoglou, D.
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Vasilopoulou, M., Georgiadou, D. G., Soultati, A., Papadimitropoulos, G., Argitis, P., Alexandropoulos, D., Vainos, N., Politi, C. T., Kamalakis, T. and Davazoglou, D. (2014) Enhancing spectral response of organic photodetectors through surface modification of metal oxide electrodes. In ICTON 2014 - 16th International Conference on Transparent Optical Networks. IEEE Computer Society. pp. 1-4 . (doi:10.1109/ICTON.2014.6876661).

Record type: Conference or Workshop Item (Paper)

Abstract

For bulk heterojunction (BHJ) organic photodetectors (OPDs), it was found that the direct contact between the deposited electrode and the photoactive organic layer leads to severe quenching of excitons. Improved device architectures hence involve the incorporation of charge transport layers, such as metal oxide layers, between electrodes and the active layer, allowing substantially higher internal efficiencies to be achieved. We show here that through appropriate surface modification of the underlying metal oxide layer, i.e. through hydrogen annealing, a novel light trapping scheme for the photoactive layer deposited on top of the metal oxide layer is developed. This is achieved via optimization of polymer morphology and chain alignment in OPD devices through the formation of an extended interfacial hydrogen bonding network acting as nucleation site for enhanced chain alignment within the bulk material.

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More information

Published date: 14 August 2014
Venue - Dates: 16th International Conference on Transparent Optical Networks, ICTON 2014, Austria, 2014-07-05 - 2014-07-09
Keywords: hydrogen bonding network, metal oxides, organic photodetector, solar absorption

Identifiers

Local EPrints ID: 440489
URI: http://eprints.soton.ac.uk/id/eprint/440489
PURE UUID: e55b0ee7-58a8-42d4-9c97-a497358eca80
ORCID for D. G. Georgiadou: ORCID iD orcid.org/0000-0002-2620-3346

Catalogue record

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

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Contributors

Author: M. Vasilopoulou
Author: A. Soultati
Author: G. Papadimitropoulos
Author: P. Argitis
Author: D. Alexandropoulos
Author: N. Vainos
Author: C. T. Politi
Author: T. Kamalakis
Author: D. Davazoglou

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