Influence of the exciton blocking layer on the stability of layered organic solar cells

Lare, Yendoubé; Kouskoussa, B.; Benchouk, K.; Djobo, S. Ouro; Cattin, Linda; Morsli, M.; Díaz, F. R.; Gacitúa, Manuel; Abachi, T.; Valle, M. A. del; Armijo, Francisco; East, Gastón A.; Bernède, J.C.

doi:10.1016/j.jpcs.2010.11.006

Cited by 38 publications

(12 citation statements)

References 35 publications

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“…It is known that S-shaped J-V characteristics are typical for the formation of a reverse diode at the contact electrode/organic material [17,18]. This effect means that in the present structures, band bending occurs not only at the CuPc/C 60 interface but also at the C 60 /cathode interface ( Figure 5).…”

Section: Resultsmentioning

confidence: 61%

Improvement in the Lifetime of Planar Organic Photovoltaic Cells through the Introduction of MoO3 into Their Cathode Buffer Layers

2014

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Recently, MoO 3 , which is typically used as an anode buffer layer in organic photovoltaic cells (OPVCs), has also been used as a cathode buffer layer (CBL). Here, we check its efficiency as a CBL using a planar heterojunction based on the CuPc/C 60 couple. The CBL is a bi-layer tris-(8-hydroxyquinoline) aluminum (Alq 3 )/MoO 3 . We show that the OPVC with MoO 3 in its CBL almost immediately exhibits lower efficiency than those using Alq 3 alone. Nevertheless, the OPVCs increase their efficiency during the first five to six days of air exposure. We explain this evolution of the efficiency of the OPVCs over time through the variation in the MoO 3 work function due to air contamination. By comparison to a classical OPVC using a CBL containing only Alq 3 , if it is found that the initial efficiency of the latter is higher, this result is no longer the same after one week of exposure to ambient air. Indeed, this result is due to the fact that the lifetime of the cells is significantly increased by the presence of MoO 3 in the CBL.

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Section: Resultsmentioning

confidence: 61%

Improvement in the Lifetime of Planar Organic Photovoltaic Cells through the Introduction of MoO3 into Their Cathode Buffer Layers

2014

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“…For small molecule organic solar cells the influence of various exciton blocking layers on the stability have been investigated. [185] It was found that Alq 3 was superior to In 2 S 3 , (Z)-5-(4-chlorobenzylidene)-3-(2-ethoxyphenyl)-2-thioxothiazolidin-4-one (CBBTZ) or bathocuproine (BCP). Lo et al found that doping the Alq 3 buffer layer with metallic magnesium enhanced the stability even better than for Alq 3 alone.…”

Section: Effect Of the Atmospherementioning

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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“…As an EA, we used fullerene (C 60 ). As a cathode buffer layer or exciton blocking layer (EBL), we used a Tris‐(8‐hydroxyquinoline) Aluminum (Alq 3 ) layer . We used an aluminum layer as a cathode.…”

Section: Methodsmentioning

confidence: 99%

The Influence of Deposition Rates on Properties of AlPcCl Thin Films and on the Performance of Planar Organic Solar Cells

Mohammed-Krarroubik

Morsli

Khelil

et al. 2017

Physica Status Solidi (a)

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The performance of organic photovoltaic cells depends on different properties of the organic materials, such as carrier mobility, band structure, morphology, and crystallinity. For AlPcCl, it is shown that these properties are dependent on the layer deposition rates. As the deposition rate increases, the surface roughness of AlPcCl layers decreases. In contrast, the crystallinity of the layers increases as the deposition rate decreases, thereby increasing the hole mobility value. These effects are opposed: the former effect allows higher open circuit voltages to be obtained as the deposition rate increases, whereas the latter increases the short circuit current as the deposition rate decreases. Therefore, there is a trade‐off between open and short circuit current values, and it is necessary to find the best deposition rate for AlPcCl. Here, it is shown that the highest mobility carriers in layers deposited slowly allow the use of thicker AlPcCl layers, which permits acceptable open circuit voltage values and optimum photovoltaic cell efficiencies to be obtained. This results in an optimum efficiency value of 3.97% for a 26‐nm‐thick AlPcCl film that is deposited at 0.02–0.03 nm s−1.

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Influence of the exciton blocking layer on the stability of layered organic solar cells

Cited by 38 publications

References 35 publications

Improvement in the Lifetime of Planar Organic Photovoltaic Cells through the Introduction of MoO3 into Their Cathode Buffer Layers

Improvement in the Lifetime of Planar Organic Photovoltaic Cells through the Introduction of MoO3 into Their Cathode Buffer Layers

Stability of Polymer Solar Cells

The Influence of Deposition Rates on Properties of AlPcCl Thin Films and on the Performance of Planar Organic Solar Cells

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