On the influence of the exciton-blocking layer on the organic multilayer cells properties

Yapi, Ahoua; Toumi, L.; Lare, Yendoubé; Soto, G.; Cattin, Linda; Toubal, Khaled; Djafri, Ayada; Morsli, M.; Khelil, A.; Valle, M. A. del; Bérnède, J.C.

doi:10.1051/epjap/2010062

Cited by 15 publications

(18 citation statements)

References 17 publications

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“…First, we have probed bathocuproine (BCP) at the BHJ/cathode interface for the interfacial engineering of our polymer PV cells, since the BCP has been extensively studied for its exciton blocking nature in order to 30202-p2 J.K. Baral et al: Improved polymer solar cell performance by engineering of cathode interface improve the performance of the small molecule PV cells [10,[17][18][19][20]22]. The control device without any interfacial layer showed fill factor (FF) and power conversion efficiency (PCE) of 53% and ∼0.83% respectively.…”

Section: Resultsmentioning

confidence: 99%

Improved polymer solar cell performance by engineering of cathode interface

Baral

Izquierdo

Packirisamy

et al. 2011

Eur. Phys. J. Appl. Phys.

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Abstract. By engineering the interface between the intermediate photoactive layer and the cathode aluminum (Al) electrode, through the introduction of ultra-thin layers of various materials, in a standard bulk heterojunction (BHJ) polymer solar cell (PSC) fabricated of regioregular poly(3-hexylthiophene) (rr-P3HT) and phenyl-C 61-butyric acid methyl ester (PCBM), the power conversion efficiency (PCE) has been effectively improved. The devices fabricated using individual single interlayer of bathocuproine (BCP), lithium fluoride (LiF) and Buckminster fullerene C60 have shown optimal efficiencies of ∼2.40%, ∼3.21% and ∼1.92% respectively. Further improvement of the photovoltaic efficiency was achieved by introducing a composite bilayer made of LiF in combination with BCP as well as with C60 at the BHJ/cathode interface. The best results were obtained by interposing a 9 nm of C60 interlayer in combination with a 0.9 nm thick LiF layer, with the PCE of the PV cells being effectively increased up to 3.94% which represents an improvement of 23% as compared to the standard device with LiF interlayer alone. The photocurrent density (J sc) versus voltage (V ) characteristic curves shows that the increase of the efficiency is essentially due to an increase in Jsc. Moreover, all the sets of devices fabricated using various interlayers over a certain range of thickness exhibit an optimum PCE that is inversely proportional to the series resistance of the PV cells. We presume that interposing a C60/LiF layer at the interface could repair the poor contact at the electron acceptor/cathode interface and improve the charge career extraction from the BHJ.

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Section: Resultsmentioning

confidence: 99%

Improved polymer solar cell performance by engineering of cathode interface

Baral

Izquierdo

Packirisamy

et al. 2011

Eur. Phys. J. Appl. Phys.

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“…In the case of conventional CBL, Alq 3 protects C 60 from damage incurred during aluminum deposition onto the organic material. Earlier studies show that there is actually some cathode metal diffusion into the organic under layer [12]. However, if the CBL should be thick enough to protect the electron accepting layer, it should also not block all charge carriers.…”

Section: Introductionmentioning

confidence: 99%

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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“…Since ITO covered the whole glass substrates, some ITO must be removed to obtain the under electrode. After masking a broad band of 25 mm by 20 mm, the ITO was etched by using Zn powder + HCl as etchant [8,9]. After scrubbing with soap, the ITO coated substrates were rinsed in running deionised water.…”

Section: Methodsmentioning

confidence: 99%

“…In the case of inverted OPVCs (IOPVCs) it was shown that the use of a MoO 3 layer thick of 6 nm allows obtaining efficient hole collection whatever is the metal of the anode [8,9]. The main aim of the present work being the study of the interface cathode/EA, we have used this classical MoO 3 /anode hole collecting structure, with Al metal electrode.…”

Section: Introductionmentioning

confidence: 99%

Improved electron collection in fullerene via caesium iodide or carbonate by means of annealing in inverted organic solar cells

et al. 2014

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Inverted organic photovoltaic cells (IOPVCs), based on the planar heterojunction C60/CuPc, were grown using MoO3 as anode buffer layer and CsI or Cs2CO3 as cathode buffer layer (CBL), the cathode being an ITO coated glass. Work functions, Φ f , of treated cathode were estimated using the cyclic voltammetry method. It is shown that Φ f of ITO covered with a Cs compounds is decreased. This decrease is amplified by the annealing. It is shown that the thermal deposition under vacuum of the CBL induces a partial decomposition of the caesium compounds. In parallel, the formation of a compound with the In of ITO is put in evidence. This reaction is amplified by annealing, which allows obtaining IOPVCs with improved efficiency. The optimum annealing conditions is 150• C for 5 min.

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On the influence of the exciton-blocking layer on the organic multilayer cells properties

Cited by 15 publications

References 17 publications

Improved polymer solar cell performance by engineering of cathode interface

Improved polymer solar cell performance by engineering of cathode interface

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

Improved electron collection in fullerene via caesium iodide or carbonate by means of annealing in inverted organic solar cells

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