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Improved performance of organic solar cells by growth optimization of MoO 3 /CuI double‐anode buffer
Author(s) -
Cattin L.,
Bernède J. C.,
Lare Y.,
DabosSeig S.,
Stephant N.,
Morsli M.,
Zamora P. P.,
Diaz F. R.,
del Valle M. A.
Publication year - 2013
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201228665
Subject(s) - materials science , absorbance , organic solar cell , substrate (aquarium) , molecule , layer (electronics) , anode , buffer (optical fiber) , chemical engineering , chemistry , nanotechnology , electrode , organic chemistry , polymer , telecommunications , oceanography , chromatography , computer science , engineering , composite material , geology
Abstract We investigated the effect of a CuI anode buffer layer (ABL) on the molecular orientation of the copper phthalocyanine (CuPc) in organic photovoltaic cells (OPV cells), and we compare it to the effect of MoO 3 buffer layer. While, in the presence of CuI, the CuPc molecules lie down parallel to the substrate, they stand up perpendicular in the case of MoO 3 . We show that the optical absorption, the morphology, and the J – V characteristics of the OPV cells depends strongly on the orientation of the CuPc molecules. The improvement of the OPV cells performance is related to the property modifications induced by the change in molecule orientation. We show that the improvement of the OPV cell performance through the templating effect of CuI depends strongly on the deposition rate of the CuI, because the CuI thin‐film morphology depends on this deposition rate. In this context, we show that the use of a double‐ABL MoO 3 /CuI leads to a significant improvement of the cell performance. These results are discussed on the basis of the dual function of MoO 3 and CuI. While both of them reduce the hole‐injection barrier, CuI improves the CuPc film absorbance through specific molecular order and MoO 3 prevents the OPV cells from leakage‐path formation.