MoO3/CuI hybrid buffer layer for the optimization of organic solar cells based on a donoraacceptor triphenylamine

We investigate the effect of anode buffer layers (ABLs) on the performances of multi-layer heterojunction solar cells with thienylenevinyleneatriphenylamine with peripheral dicyanovinylene groups (TDCVaTPA) as donor material and fullerene C60 as acceptor. The deposition of a CuI layer between the IT...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2013-03, Vol.110, p.107-114
Main Authors: Bernede, Jean Christian, Cattin, Linda, Makha, Mohammed, Jeux, Victorien, Leriche, Philippe, Roncali, Jean, Froger, Vincent, Morsli, Mustapha, Addou, Mohammed
Format: Article
Language:English
Subjects:
Anodes
Buckminsterfullerene
Buffer layers
Current density
Fullerenes
Photovoltaic cells
Solar cells
Volatile organic compounds
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Summary:We investigate the effect of anode buffer layers (ABLs) on the performances of multi-layer heterojunction solar cells with thienylenevinyleneatriphenylamine with peripheral dicyanovinylene groups (TDCVaTPA) as donor material and fullerene C60 as acceptor. The deposition of a CuI layer between the ITO anode and the electron donor significantly improves the short-circuit current density (Jsc) and fill factor (FF) but reduces the open-circuit voltage (Voc). On the other hand, a MoO3 buffer layer increases the Voc but leads to limited Jsc and FF values, thus reducing power conversion efficiency (PCE). In this context, we show that the use of a hybrid anode buffer layer MoO3/CuI leads to a considerable improvement of the cells performances and a PCE of 2.50% has been achieved. These results are discussed on the basis of the dual function of MoO3 and CuI. While both of them reduce the hole injection barrier, CuI improves the conductivity of the organic film through an improvement of molecular order while MoO3 prevents leakage current through the diode. Finally the results of a cursory study of the ageing process provide further support to this interpretation of the effects of the various buffer layers.
ISSN:0927-0248