Monolayer passivation of the transparent electrode in organic solar cells

Johnev, B.; Vogel, M.; Fostiropoulos, K.; Mertesacker, B.; Rusu, M.; Lux‐Steiner, M.; Weidinger, A.

doi:10.1016/j.tsf.2005.04.058

Cited by 40 publications

(18 citation statements)

References 24 publications

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“…(iii) Lastly interfaces are known to limit OSCs lifetimes [17][18][19]. In particular, recently published results have shown that the PEDOT-PSS layer is susceptible to induce the degradation of the active layer [17].…”

Section: Introductionmentioning

confidence: 99%

Morphology and photochemical stability of P3HT:PCBM active layers of organic solar cells

Dupuis

Tournebize

Bussière

et al. 2011

Eur. Phys. J. Appl. Phys.

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We report on the effects of continuous UV-visible light illumination at 60°C in the absence of oxygen on P3HT:PCBM blend films commonly used active layer of bulk heterojunction solar cells. A full description of the behavior of P3HT:PCBM blend films either unconfined or confined by an Al cathode and a PEDOT:PSS layer during annealing treatment and irradiation is provided. We also focused on the impact of the P3HT-type on the photostability. It was shown that the microstructure of P3HT dramatically influenced the photodegradation process of P3HT thin films deposited on inert substrate. The rate of photodegradation process was decreased when P3HT was blended with PCBM. It was shown that the photostability of the 2 active layer was not influenced by a PEDOT-PSS sub-layer. Solar cells were then fabricated from high-regioregular P3HT. Many large PCBM crystals were observed in P3HT:PCBM blend films and it was shown that the top surface of the active layer in contact with the Al cathode was nearly entirely composed of P3HT. Both results account for the low performances of the devices. Finally, photo-ageing experiments provoked a rapid failure of the Al cathodes which was tentatively attributed to an increase of internal strain within the devices.

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Section: Introductionmentioning

confidence: 99%

Morphology and photochemical stability of P3HT:PCBM active layers of organic solar cells

Dupuis

Tournebize

Bussière

et al. 2011

Eur. Phys. J. Appl. Phys.

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“…In particular, the importance of the electronic transition between organic films and inorganic electrodes has been pointed out in numerous publications. [1][2][3][4] One solution has been to insert a so-called exciton blocking layer between electron transport layer and emissive layer in the case of organic light emitting device 5 or between electrode and acceptor materials in the case of organic photovoltaic cells. 6 It is the aim of this work to shed some light on the function of a bathocuproine ͑BCP͒ exciton blocking layer in organic photovoltaic cells.…”

mentioning

confidence: 99%

“…Prior to deposition of the active layer, ITO substrates were coated with a thin layer of poly͑ethylene dioxythiophene͒ doped with polystyrene sulfonic acid ͑PEDOT:PSS͒ or treated with phosphoric acid as described in a previous publication. 4 The Al back electrode was equally deposited in situ by thermal evaporation. Film thicknesses were monitored by means of quartz crystal microbalances.…”

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confidence: 99%

On the function of a bathocuproine buffer layer in organic photovoltaic cells

Vogel¹,

Doka²,

Breyer³

et al. 2006

Applied Physics Letters

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182

120

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The role of bathocuproine ͑BCP͒ buffer layer inserted between active layer and Al contact in photovoltaic cells based on phthalocyanine ͑Pc͒ and C 60 was investigated. Photoluminescence ͑PL͒ experiments show exciton quenching at the C 60 -Al interface to be strongly reduced by inserting BCP. Current-voltage characteristics of photovoltaic cells with planar geometry front electrode/ Pc/ C 60 / BCP/ Al show that BCP dramatically improves electron transport out of the C 60 film into the Al electrode. The tenfold increase in power conversion efficiency ͑͒ with BCP can mostly be attributed to the latter effect. BCP does not improve in photovoltaic cells with blend film geometry front electrode/Pc: C 60 / Al.

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“…This buffer layer is very efficient since it allows achieving good adjustment of the work function, passivation of surface defects and it smoothes the ITO surface. However, PEDOT:PSS is problematic since it degrades under UV illumination, it introduces water into the active layer and it is slightly acidic [ 6]. Oxidation of ITO surface by O 2 plasma or UV ozone treatment can increase its work function , ITO , up to nearly = 5 eV [7].…”

Section: Introductionmentioning

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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Monolayer passivation of the transparent electrode in organic solar cells

Cited by 40 publications

References 24 publications

Morphology and photochemical stability of P3HT:PCBM active layers of organic solar cells

Morphology and photochemical stability of P3HT:PCBM active layers of organic solar cells

On the function of a bathocuproine buffer layer in organic photovoltaic cells

About the transparent electrode of the organic photovoltaic cells

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