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Nanostructured metal oxides as cathode interfacial layers for hybrid-polymer electronic devices

Nanostructured metal oxides as cathode interfacial layers for hybrid-polymer electronic devices
Nanostructured metal oxides as cathode interfacial layers for hybrid-polymer electronic devices
We report the use of nanostructured metal oxides as cathode interfacial layers for improved performance hybrid polymer electronic devices such as light-emitting diodes (PLEDs) and solar cells. In particular, we employ a stoichiometric (WO3) and a partially reduced tungsten metal oxide (WOx) (x<3), both deposited as very thin layers between an aluminum (Al) cathode and the active polymer layer in hybrid PLEDs and achieve improved PLED device performance reflected as an increase in the current density and luminance and a reduction of the operating voltage. On the other hand, we investigate the use of a stoichiometric tungsten oxide layer as a thin cathode interfacial layer in hybrid polymer photovoltaic cells (Hy-PVs). We demonstrate improved photovoltaic cell performance, primarily as a result of the substantial increase in the short-circuit photocurrent. The improved PLED device characteristics are attributed to enhanced electron injection that primarily results from the lowering of the effective interfacial barrier, as evidenced by photovoltaic open circuit voltage measurements, and improved electron transfer. On the other hand, the observed improvement in the hybrid solar cell performance is primarily attributed to its enhanced internal quantum efficiency, most likely due to the improved electron transport and extraction at the active layer/WO3/Al interface and the reduction of the corresponding contact series resistance. Correlation between the metal oxide surface morphology and the device performance is also investigated and will be discussed.
1662-0356
74-78
Vasilopoulou, Maria
aad1381e-d091-4090-8c7c-b74bed22393d
Palilis, Leonidas C.
0945ac0e-0f15-4415-9366-8d6f73b5af86
Georgiadou, Dimitra G.
84977176-3678-4fb3-a3dd-2044a49c853b
Argitis, Panagiotis
ab9c4ea6-3dd2-4e34-935d-81bfb360f358
Kostis, Ioannis
581b7f72-42a8-4770-9965-78e5d1979289
Papadimitropoulos, George
08d9f89f-209d-43db-9e83-2ebb9e24b061
Stathopoulos, Nikolaos A.
107b0d08-4fbb-4f19-acd3-9ff47fe3d503
Iliadis, Agis
f5f34a1c-de1d-4d46-976a-b11501a6f4e5
Konofaos, Nikolaos
dfa95a2f-907d-456c-b52c-71ab7c884cbe
Davazoglou, Dimitris
a946cf5d-287a-4734-ba55-b180ab4525ed
Vasilopoulou, Maria
aad1381e-d091-4090-8c7c-b74bed22393d
Palilis, Leonidas C.
0945ac0e-0f15-4415-9366-8d6f73b5af86
Georgiadou, Dimitra G.
84977176-3678-4fb3-a3dd-2044a49c853b
Argitis, Panagiotis
ab9c4ea6-3dd2-4e34-935d-81bfb360f358
Kostis, Ioannis
581b7f72-42a8-4770-9965-78e5d1979289
Papadimitropoulos, George
08d9f89f-209d-43db-9e83-2ebb9e24b061
Stathopoulos, Nikolaos A.
107b0d08-4fbb-4f19-acd3-9ff47fe3d503
Iliadis, Agis
f5f34a1c-de1d-4d46-976a-b11501a6f4e5
Konofaos, Nikolaos
dfa95a2f-907d-456c-b52c-71ab7c884cbe
Davazoglou, Dimitris
a946cf5d-287a-4734-ba55-b180ab4525ed

Vasilopoulou, Maria, Palilis, Leonidas C., Georgiadou, Dimitra G., Argitis, Panagiotis, Kostis, Ioannis, Papadimitropoulos, George, Stathopoulos, Nikolaos A., Iliadis, Agis, Konofaos, Nikolaos and Davazoglou, Dimitris (2010) Nanostructured metal oxides as cathode interfacial layers for hybrid-polymer electronic devices. Advances in Science and Technology, 75, 74-78. (doi:10.4028/www.scientific.net/AST.75.74).

Record type: Article

Abstract

We report the use of nanostructured metal oxides as cathode interfacial layers for improved performance hybrid polymer electronic devices such as light-emitting diodes (PLEDs) and solar cells. In particular, we employ a stoichiometric (WO3) and a partially reduced tungsten metal oxide (WOx) (x<3), both deposited as very thin layers between an aluminum (Al) cathode and the active polymer layer in hybrid PLEDs and achieve improved PLED device performance reflected as an increase in the current density and luminance and a reduction of the operating voltage. On the other hand, we investigate the use of a stoichiometric tungsten oxide layer as a thin cathode interfacial layer in hybrid polymer photovoltaic cells (Hy-PVs). We demonstrate improved photovoltaic cell performance, primarily as a result of the substantial increase in the short-circuit photocurrent. The improved PLED device characteristics are attributed to enhanced electron injection that primarily results from the lowering of the effective interfacial barrier, as evidenced by photovoltaic open circuit voltage measurements, and improved electron transfer. On the other hand, the observed improvement in the hybrid solar cell performance is primarily attributed to its enhanced internal quantum efficiency, most likely due to the improved electron transport and extraction at the active layer/WO3/Al interface and the reduction of the corresponding contact series resistance. Correlation between the metal oxide surface morphology and the device performance is also investigated and will be discussed.

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Published date: 1 October 2010

Identifiers

Local EPrints ID: 440511
URI: http://eprints.soton.ac.uk/id/eprint/440511
ISSN: 1662-0356
PURE UUID: e91b5348-0693-406c-9428-66a811e506db
ORCID for Dimitra G. Georgiadou: ORCID iD orcid.org/0000-0002-2620-3346

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Date deposited: 06 May 2020 16:30
Last modified: 29 Jul 2020 01:54

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Contributors

Author: Maria Vasilopoulou
Author: Leonidas C. Palilis
Author: Panagiotis Argitis
Author: Ioannis Kostis
Author: George Papadimitropoulos
Author: Nikolaos A. Stathopoulos
Author: Agis Iliadis
Author: Nikolaos Konofaos
Author: Dimitris Davazoglou

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