Electronic properties of interfaces between model organic semiconductors and metals

Knupfer, M.; Peisert, Heiko

doi:10.1002/pssa.200304332

Cited by 123 publications

(88 citation statements)

References 39 publications

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“…To select a proper material for an interlayer, which should lead to desired properties of organic system, we have to take into account work function of electrodes, electron affinity and ionization energy of organic materials. The fact that the interface dipole layers modify the height of barriers for electrons and holes can increase the complexity of the problem [14][15][16][17]. Gap states can participate in charge carrier transport through interlayer.…”

Section: Conclusion and Summarymentioning

confidence: 99%

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Modification of current-voltage characteristics of planar organic systems by nm-thick copper phthalocyanine or perylene dye interlayer

Signerski

Jarosz

2013

Open Physics

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Abstract:The effect of a nm-thick interlayer of copper phthalocyanine (CuPc) or perylene dye (MePTCDI) on currentvoltage characteristics of planar organic systems is discussed in this work. The MePTCDI layer in the ITO/MePTCDI/CuPc/Au system strongly reduces reverse dark current by blocking injection of holes from ITO into CuPc leading to high values of rectification ratio. The CuPc interlayer in the ITO/CuPc/MePTCDI/Ag system causes a strong reduction in electron injection from ITO and reverses a forward polarity. Modification of current-voltage characteristics of illuminated systems with an interlayer of MePTCDI or CuPc is associated with a strong photovoltaic effect. This results from efficient excition dissociation at the CuPc/MePTCDI interface. Saturation current, determined by this process of charge carrier photogeneration, can be observed at particular voltage polarity. PACS

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Section: Conclusion and Summarymentioning

confidence: 99%

“…We must, however, bear in mind that uncertainty of energy values (in particular levels transporting electrons) is ca 0.5 eV. Additionally, in real structures dipole layers and band bending can considerably modify the alignments of energy levels at interfaces [14][15][16][17]. MePTCDI (see absorption spectra in [7]).…”

Section: Introductionmentioning

confidence: 99%

Modification of current-voltage characteristics of planar organic systems by nm-thick copper phthalocyanine or perylene dye interlayer

Signerski

Jarosz

2013

Open Physics

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“…The interface phenomena are thus crucial towards the development, understanding and improvement of organic-based semiconductor electronic device [1][2][3][4][5][6][7][8][9][10][11][12][13][14] applications such as organic light emitting devices (OLEDs) [15][16][17][18], organic photovoltaic devices [19][20][21], organic thin film transistor devices [22][23][24][25][26][27] and organic spin electronic devices in which the transport and control of spin polarized information are represented [28][29][30]. The interface between the different materials that make them up determines the charge transport and charge injection efficiency, with implications for the performance of the devices.…”

Section: Introductionmentioning

confidence: 99%

Effect of Switching on Metal-Organic Interface Adhesion Relevant to Organic Electronic Devices

Babatope¹,

Akogwu²,

Adewoye³

et al. 2013

AMPC

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Considerable efforts are currently being devoted to investigation of metal-organic, organic-organic and organic-inorganic interfaces relevant to organic electronic devices such as organic light emitting diode (OLEDs), organic photovoltaic solar cells, organic field effect transistors (OFETs), organic spintronic devices and organic-based Write Once Read Many times (WORM) memory devices on both rigid and flexible substrates in laboratories around the world. The multilayer structure of these devices makes interfaces between dissimilar materials in contact and plays a prominent role in charge transport and injection efficiency which inevitably affect device performance. This paper presents results of an initial study on how switching between voltage thresholds and chemical surface treatment affects adhesion properties of a metal-organic (Au-PEDOT:PSS) contact interface in a WORM device. Contact and Tapping-mode Atomic Force Microscopy (AFM) gave surface topography, phase imaging and interface adhesion properties in addition to SEM/EDX imaging which showed that surface treatment, switching and surface roughness all appeared to be key factors in increasing interface adhesion with implications for increased device performance.

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“…The type of the interaction at the interface -physorption or chemisorption-can significantly affect the device performance. Charge transfer or chemical reaction was found for organic molecules in contact with several potential electrode materials 111 . XPS and UPS are often used to estimate the dipole potential and investigate the chemical behaviour at the interface.…”

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confidence: 99%

Organic Photovoltaic Cells: History, Principle and Techniques

Bérnède

2008

J. Chil. Chem. Soc.

147

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In this review we present an overview of the different organic solar cells families. After recalling shortly the specificities of organic materials, the band structure, the electronic properties and the charge separation process in organic materials are shortly described. Then the new organic solar cell concepts are presented. Plastic organic solar cells consist either of two organic layers or a homogeneous mixture of two organic materials. One of them -either an organic dye or a semiconducting polymer -donates the electrons. The other component serves as the electron acceptor. Principles of these multi-layers and bulk heterojunctions are presented and discussed. Then some typical examples are presented, showing the fast evolution of the cells performances. Finally, a specific attention is devoted to the interfaces electrodes/organics. Indeed recent results show that, at least in the case of multi-layers cells, the introduction of thin buffer layers at the interfaces cathode/organic acceptor and/or anode/organic donor, can strongly improve the efficiency of the organic solar cells. About the interface organic acceptor/cathode, we report the influence of an exciton-blocking layer and/or an Al 2 O 3 thin layer on the efficiency of CuPc/C 60 based photovoltaic cells. The presence, or not, of a thin Al 2 O 3 layer depends on the encapsulating process of the devices. In the case of glass/ITO/CuPc/C 60 /Al cells, the presence of an Al 2 O 3 thin layer at the interface "organic acceptor/aluminium" increases strongly the open circuit voltage of the cells but decreases slightly their short circuit current and fill factor. In the case of glass/ITO/CuPc/C 60 /Alq 3 /Al cells, the open circuit voltage is systematically higher than without Alq 3 . However, in that case, the presence of Al 2 O 3 does not improve significantly the cell performances. All these results are discussed in terms of series and shunt resistance values related to possible oxygen contamination and organic covalent action with the Al films. The effectiveness of these different phenomena depends on the presence, or not, of Alq 3 and/or Al 2 O 3 layers.About the interface anode/organic donor, it is shown that an ultra thin metallic film improves significantly the short circuit current and the cell performances. The anode in plastic solar cells, which is a transparent conductive oxide (TCO), is usually an indium tin oxide film (ITO). Indeed, when a ZnO anode is used, cells performances are far from those achieved with ITO. However, strong improvement of the cells efficiency is encountered when an ultra thin buffer layer is introduced between the ZnO and the organic film. The presence of this ultra thin buffer layer at the surface of the TCO allows decreasing the performance difference between the cells using ITO and those using ZnO. More generally such ultra thin buffer layer improves the solar cells performances.

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Electronic properties of interfaces between model organic semiconductors and metals

Cited by 123 publications

References 39 publications

Modification of current-voltage characteristics of planar organic systems by nm-thick copper phthalocyanine or perylene dye interlayer

Modification of current-voltage characteristics of planar organic systems by nm-thick copper phthalocyanine or perylene dye interlayer

Effect of Switching on Metal-Organic Interface Adhesion Relevant to Organic Electronic Devices

Organic Photovoltaic Cells: History, Principle and Techniques

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