Dipole induced anomalous S-shape I-V curves in polymer solar cells

Kumar, Ankit; Sista, Srinivas; Yang, Yang

doi:10.1063/1.3117513

Cited by 232 publications

(173 citation statements)

References 28 publications

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“…The result of the study was to show that a Df across the interface caused a degradation of the device efficiency and formation of an "S-shaped" current density-voltage (J-V) curve. 19,20 The Df is compensated by charge transfer across the interface, creating a second diode in the opposite direction to the intended device. 20 When a forward bias is applied sufficient to overcome the Df, normal diode behavior resumes.…”

Section: Numerous Organicmentioning

confidence: 99%

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Mixed interlayers at the interface between PEDOT:PSS and conjugated polymers provide charge transport control

et al. 2015

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Poly(3,4-ethylenedioxythiophene)-poly(styrenesulphonate) (PEDOT:PSS) is the most used organic hole injecting or hole transporting material. The hole carrying matrix PEDOT is highly doped by the acidic dopant PSS. When coated onto a substrate, PEDOT:PSS makes a highly uniform conductive layer and a thin (<5 nm) overlayer of PSS covers the air interface. Semiconducting polymer layers for organic photovoltaics or light emitting diodes are coated on top. In this article, we demonstrate that the PSS layer will mix with almost all conjugated polymers upon thermal annealing. Depending on the Fermi energy of the polymer an electrochemical reaction can take place, p-type doping the polymer at the interface between the PEDOT:PSS and the semiconducting polymer. We use chemical and spectroscopic analysis to characterize the polymer/PSS interlayer. We show that the stable and insoluble interlayer has a great effect on the charge injection and extraction from the interface. Finally we demonstrate and electronically model organic photovoltaic devices that are fabricated using these mixed interlayers.

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Section: Numerous Organicmentioning

confidence: 99%

“…19,20 The Df is compensated by charge transfer across the interface, creating a second diode in the opposite direction to the intended device. 20 When a forward bias is applied sufficient to overcome the Df, normal diode behavior resumes.…”

Section: Numerous Organicmentioning

confidence: 99%

Mixed interlayers at the interface between PEDOT:PSS and conjugated polymers provide charge transport control

et al. 2015

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“…Indeed, the latter would lead to PCBM accumulation near the device anode and thereby introduce a hole collection barrier and/or interfacial dipoles. [44] The barrier amplitude would depend on the PCBM volume fraction and vary with light intensity (through photo-inducted appearance of negatively charged fullerenes). Almost absent during the ICPE measurements (low intensity light), the barrier is expected to inhibit device operation under AM1.5 illumination (high intensity light).…”

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confidence: 99%

A New Supramolecular Route for Using Rod‐Coil Block Copolymers in Photovoltaic Applications

et al. 2010

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International audienceA new polymer blend formed by poly(3-hexylthiophene)-poly(4-vinylpyridine) (P3HT-P4VP) block copolymers and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is reported. The P4VP and PCBM are mixed together by weak supramolecular interactions, and the resulting materials exhibit microphase separated morphologies of electron-donor and electron-acceptor rich domains. The properties of the blend, used in photovoltaic devices as active layers, are also discussed

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“…During the fabrication of so many devices we found 507 three issues that were likely to reduce device quality (without changing substrates 508 or metal type): 509 1. Occasionally, there is a PEDOT:PSS batch supplied that produces exclusively 510 S-shaped J/V curves with low FF [119,120] This problem could only be solved 511 by ordering new PEDOT:PSS and is attributed to slight changes in the doping 512 level of the PEDOT:PSS itself. 513 2.…”

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confidence: 99%

P3HT-Based Solar Cells: Structural Properties and Photovoltaic Performance

Moulé

Neher

Turner

2014

P3HT Revisited – From Molecular Scale to Solar Cell Devices

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Each year we are bombarded with B.Sc. and Ph.D. applications from 8 students that want to improve the world. They have learned that their future depends 9 on changing the type of fuel we use and that solar energy is our future. The hope and 10 energy of these young people will transform future energy technologies, but it will 11 not happen quickly. Organic photovoltaic devices are easy to draw AU1, but the mate-12 rials, processing steps, and ways of measuring the properties of the materials are 13 very complicated. It is not trivial to make a systematic measurement that will 14 change the way other research groups think or practice. In approaching this chapter, 15 we thought about what a new researcher would need to know about organic 16 photovoltaic devices and materials in order to have a good start in the subject. [1][2][3][4]. Similar 43 to the gold rush in the 1800s and the oil boom in the 1900s, intellectual property on 44 new technologies is now the boom industry for innovative people to become rich 45 and influential fast. In the twenty-first century, scientists and engineers are the 46 pioneers and our ideas are the prize. One of the most alluring energy technologies of 47 the past decade has been organic photovoltaics (OPV). This technology is alluring 48 because it could potentially reduce the cost of producing photovoltaic 49 (PV) modules and thereby make solar energy cost-competitive with fossil fuels. 50 As can be seen in Fig. 1, the allure of OPV brought thousands of scientists and 51 engineers into this new field, generating an exponential increase in scientific 52 knowledge (as measured by the number of scientific AU4 articles) in this area. The 53 sharp focus on OPV technology has led to an explosion of interest in enabling 54 technologies such as polymer synthesis, polymer physics, microstructural measure-55 ment techniques, multiscale modeling, photophysics, organic electronics, organic-56 inorganic hybrid materials, etc. All of this intense focus into one research area has 57 also created intense competition between research groups. With so many new 58 scientific articles published yearly, it is impossible to read them all, and repeat or 59 redundant articles have become unfortunately and unavoidably common. Even 60 review articles and books about OPV have proliferated, making production of an 61 original perspective difficult and a complete literature review impractical. We 62 apologize in advance if any important work is not cited here. 63Under this backdrop, we have decided to produce an article that is designed to be 64 helpful to students and postdocs who are entering this field. Rather than focusing on 65 the efficiency of devices or the morphology of materials (subjects that are covered 66 very well elsewhere), we instead focus some attention on how to approach OPV 67 research from a more practical (laboratory-based) perspective. Section 1 introduces A.J. Moulé et al. 68OPV devices, modules, and scale-up. Section 2 discusses fabrication of poly-3- Device Characterist...

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Dipole induced anomalous S-shape I-V curves in polymer solar cells

Cited by 232 publications

References 28 publications

Mixed interlayers at the interface between PEDOT:PSS and conjugated polymers provide charge transport control

Mixed interlayers at the interface between PEDOT:PSS and conjugated polymers provide charge transport control

A New Supramolecular Route for Using Rod‐Coil Block Copolymers in Photovoltaic Applications

P3HT-Based Solar Cells: Structural Properties and Photovoltaic Performance

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