Bernede, J. .-C., Nguyen, D. .-T., Cattin, L., Morsli, M., Kanth, S. R. B. & Patil, S. (2011) About the transparent electrode of the organic photovoltaic cells. Eur. Phys. J.-Appl. Phys, 56 34102.
Added by: Laurent Cournède (2016-03-10 21:32:19)
|Type de référence: Article
Numéro d'identification (ISBN etc.): 1286-0042
Clé BibTeX: Bernede2011
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Mots-clés: buffer layer, indium tin oxide, Interface, low driving voltage, open-circuit voltage, passivation, performance, recombination, solar-cells, work function
Créateurs: Bernede, Cattin, Kanth, Morsli, Nguyen, Patil
Collection: Eur. Phys. J.-Appl. Phys
Consultations : 8/426
Indice de consultation : 1%
Indice de popularité : 0.25%
Electrodes and the nature of their contact with organic materials play a crucial role in the realization of efficient optoelectronic components. Whether the injection (organic light-emitting diodes - OLEDs) or collection (organic photovoltaic cells - OPV cells) of carriers, contacts must be as efficient as possible. To do this, it is customary to refer to electrode surface treatment and/or using a buffer layer all things to optimize the contact. Efficiency of organic photovoltaic cells based on organic electron donor/organic electron acceptor junctions can be strongly improved when the transparent conductive anode is coated with a buffer layer (ABL). We show that an ultra-thin gold (0.5 nm) or a thin molybdenum oxide (3-5 nm) can be used as efficient ABL. However, the effects of these ABL depend on the highest occupied molecular orbital (HOMO) of different electron donors of the OPV cells. The results indicate that, in the case of metal ABL, a good matching between the work function of the anode and the highest occupied molecular orbital of the donor material is the major factor limiting the hole transfer efficiency. Indeed, gold is efficient as ABL only when the HOMO of the organic donor is close to its work function Phi(Au). MoO3 has a wider field of application as ABL than gold. The role of the oxide is not so clearly understood than that of Au, different models proposed to interpret the experimental results are discussed.
Added by: Laurent Cournède