The effect of a MoOx hole-extracting layer on the performance of organic photovoltaic cells based on small molecule planar heterojunctions

Hancox, Ian; Sullivan, Paul; Chauhan, Kamlesh V.; Beaumont, Nicola L.; Rochford, Luke A.; Hatton, Ross A.; Jones, T. S.

doi:10.1016/j.orgel.2010.09.014

Cited by 94 publications

(81 citation statements)

References 28 publications

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“…[193] Hancox et al have found a similar enhanced lifetime of small molecule solar cells with a MoO x hole-extraction layer. [194] Chromium oxide-chromium nitride films prepared by sputtering have been used by Qin et al as another alternative to PEDOT:PSS. [195] Lloyd et al studied inverted geometry devices with and without a PEDOT:PSS hole transport layer and found a great difference in degradation was seen in the solar cell parameters (V oc , I sc , FF and PCE).…”

Section: The Hole Transport Layermentioning

confidence: 99%

Stability of Polymer Solar Cells

et al. 2011

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Organic photovoltaics (OPVs) evolve in an exponential manner in the two key areas of efficiency and stability. The power conversion efficiency (PCE) has in the last decade been increased by almost a factor of ten approaching 10%. A main concern has been the stability that was previously measured in minutes, but can now, in favorable circumstances, exceed many thousands of hours. This astonishing achievement is the subject of this article, which reviews the developments in stability/degradation of OPVs in the last five years. This progress has been gained by several developments, such as inverted device structures of the bulk heterojunction geometry device, which allows for more stable metal electrodes, the choice of more photostable active materials, the introduction of interfacial layers, and roll-to-roll fabrication, which promises fast and cheap production methods while creating its own challenges in terms of stability.

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Section: The Hole Transport Layermentioning

confidence: 99%

Stability of Polymer Solar Cells

et al. 2011

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“…charge transport applications. 45,54 See supplementary material for additional information on XPS data analysis and XRR measurements. …”

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confidence: 99%

Processing and charge state engineering of MoOx

et al. 2017

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The effects of wet chemical processing employed in device fabrication standards are studied on molybdenum oxide (MoOx) ultra-thin films. We have combined x-ray photoelectron spectroscopy (XPS), angle resolved XPS and x-ray reflectivity to gain insight into the changes in composition, structure and electronic states upon treatment of films with different initial stoichiometry prepared by reactive sputtering. Our results show significant reduction effects associated with the development of gap states in MoOx, as well as changes in the composition and structure of the films, systematically correlated with the initial oxidation state of Mo.

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“…On the contrary, Zhang et col. [32] show that the contamination of the surface of MoO 3 , not only decreases IP, EA and MoO3 , but also its efficiency as buffer layer in OPV cells plug. Others hole paths have been proposed introducing gap states in the MoO 3 [33]. Indeed as said above the evaporated films are not stoichiometrics but oxygen deficient, which can induce band gap state formation.…”

Section: Discussionmentioning

confidence: 99%

About the transparent electrode of the organic photovoltaic cells

Bérnède

Nguyen

Cattin

et al. 2011

Eur. Phys. J. Appl. Phys.

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Abstract. 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 emittin g diodesOLEDs) 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 contac t. 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 clos e to its work function Au . MoO 3 has a wider field of application as ABL than gold , The role of the oxide is not so clearly understand than that of Au , different models proposed to interpret the experimental results are discussed.

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The effect of a MoOx hole-extracting layer on the performance of organic photovoltaic cells based on small molecule planar heterojunctions

Cited by 94 publications

References 28 publications

Stability of Polymer Solar Cells

Stability of Polymer Solar Cells

Processing and charge state engineering of MoOx

About the transparent electrode of the organic photovoltaic cells

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