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Effect of the nature of the anode buffer layer – MoO3, CuI or MoO3/CuI – on the performances of organic solar cells based on oligothiophene thin films deposited by sublimation

Published online by Cambridge University Press:  03 December 2012

Mohammed Makha
Affiliation:
Université de Nantes, Moltech Anjou, UMR 6200, 2 rue de la Houssinière, BP 92208, 44000 Nantes, France Laboratoire Optoélectronique et Physico-chimie des Matériaux, Université Ibn Tofail, Faculté des Sciences, BP 133, Kenitra 14000, Morocco
Linda Cattin
Affiliation:
Université de Nantes, Institut des Matériaux Jean Rouxel (IMN), UMR 6502, 2 rue de la Houssinière, BP 92208, 44000 Nantes, France
Sanoussi Ouro Djobo
Affiliation:
Université de Nantes, Moltech Anjou, UMR 6200, 2 rue de la Houssinière, BP 92208, 44000 Nantes, France
Nicolas Stephant
Affiliation:
Université de Nantes, Institut des Matériaux Jean Rouxel (IMN), UMR 6502, 2 rue de la Houssinière, BP 92208, 44000 Nantes, France
Nicole Langlois
Affiliation:
Université de Nantes, Institut des Matériaux Jean Rouxel (IMN), UMR 6502, 2 rue de la Houssinière, BP 92208, 44000 Nantes, France
Benoit Angleraud
Affiliation:
Université de Nantes, Institut des Matériaux Jean Rouxel (IMN), UMR 6502, 2 rue de la Houssinière, BP 92208, 44000 Nantes, France
Mustapha Morsli
Affiliation:
Université de Nantes, Faculté des Sciences et des Techniques, 2 rue de la Houssinière, BP 92208, 44000 Nantes, France
Mohammed Addou
Affiliation:
Laboratoire Optoélectronique et Physico-chimie des Matériaux, Université Ibn Tofail, Faculté des Sciences, BP 133, Kenitra 14000, Morocco
Jean-Christian Bernède
Affiliation:
Université de Nantes, Moltech Anjou, UMR 6200, 2 rue de la Houssinière, BP 92208, 44000 Nantes, France
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Abstract

An oligothiophene having a donor-acceptor-donor chromophore with hydrogen bonding groups is used as electron donor in planar heterojunction organic photovoltaic cells. We focus on the contact between the anode and the oligothiophene. Different anode buffer layers (ABLs) have been used, MoO3 and CuI, alone or coupled with MoO3. The thicknesses were 4 nm and 3 nm for MoO3 and CuI respectively. It is shown that the ABL improves the cells performances. The best results are achieved with the couple MoO3/CuI through an increase of the open circuit voltage and short circuit current. The optical absorption, the surface roughness and the organic film conductivity depend on the ABL. The conductivity of the oligothiophene film is one order of magnitude higher when the ABL is a CuI film. The influence of the ABL can be explained partly by the fact that it raises the anode work function. Nevertheless, the study of the structures ITO/ABL/oligothiophene shows that each ABL exhibits specific advantages and disadvantages. Therefore the couple MoO3/CuI allows summing up the advantages of both ABLs, MoO3 allows a very good band matching and avoids too high leakage current, while CuI allows achieving high Jsc thanks to its effect on the TTB conductivity.

Type
Research Article
Copyright
© EDP Sciences, 2012

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Effect of the nature of the anode buffer layer – MoO3, CuI or MoO3/CuI – on the performances of organic solar cells based on oligothiophene thin films deposited by sublimation
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Effect of the nature of the anode buffer layer – MoO3, CuI or MoO3/CuI – on the performances of organic solar cells based on oligothiophene thin films deposited by sublimation
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Effect of the nature of the anode buffer layer – MoO3, CuI or MoO3/CuI – on the performances of organic solar cells based on oligothiophene thin films deposited by sublimation
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