Organic Thin Film Photovoltaic Devices from Discotic Materials

Schmidt‐Mende, Lukas; Watson, Mark M.; Müllen, Kläus; Friend, Richard H.

doi:10.1080/15421400390213203

Cited by 48 publications

(28 citation statements)

References 22 publications

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“…The UV/Vis spectrum of the series of 2,11-and 2,5-substituted FHBC-DOT compounds in dichloromethane solution (10 À5 m) are shown in Figure 2a and b. In both series of compounds in moving from zero thiophene units to three-thiophene dendron (3T) substituents, no redshift was observed either for the maximum absorption wavelength or the onset absorption wavelength.…”

Section: Resultsmentioning

confidence: 93%

“…[8] There have only been limited reports on the use of HBCs in organic solar cells. [9][10][11][12] Recently, we reported the synthesis and optoelectronic properties of highly-soluble easily-functionalised HBC building blocks carrying conjugated substituents. [13] The primary challenge in the synthesis of these systems is the incorporation of conjugated substituents and alkyl groups for solubility.…”

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confidence: 99%

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Fluorenyl Hexa‐peri‐hexabenzocoronene‐Dendritic Oligothiophene Hybrid Materials: Synthesis, Photophysical Properties, Self‐Association Behaviour and Device Performance

Wong

Pisula

et al. 2011

Chemistry A European J

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Apart from molecular properties, intermolecular forces play a vital role in defining the performance of organic electronic devices. This is particularly relevant in bulk heterojunction (BHJ) solar cells in which the arrangement of electron-donor and -acceptor materials into distinct crystalline phases of ideal size and distribution can lead to better power conversion efficiencies. In this study, a series of fluorenyl hexa-peri-hexabenzocoronenes (FHBC) decorated with thiophene dendrons (DOT) of variable size was obtained by using a convergent synthetic approach. With such variety of molecular sizes and shapes in hand, the objective of this study is to highlight the relationships between molecular properties, bulk properties and device performance. Correlations between π-π stacking ability and dendrimer generation were established from self-organisation studies in solution and solid state. The synergistic combination of molecular organisation at the nanoscale and photophysical characteristics derived from the FHBC and DOT moieties leads to a notable improvement of the photovoltaic performance.

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Section: Resultsmentioning

confidence: 93%

mentioning

confidence: 99%

Fluorenyl Hexa‐peri‐hexabenzocoronene‐Dendritic Oligothiophene Hybrid Materials: Synthesis, Photophysical Properties, Self‐Association Behaviour and Device Performance

Wong

Pisula

et al. 2011

Chemistry A European J

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“…Later, they tried several other HBC-based DLCs (Figure 4) to prepare PV solar cells. 80,81 However, none of these devices could cross the PCE of the above-mentioned first device. PCE of some of the HBC-based DLCs used in PV solar cells are presented in Table 1.…”

Section: Hexabenzocoronene Dlcs In Pvsmentioning

confidence: 99%

“…82 Replacing the perylene dye 2a by other perylene dyes such as 2b-2d ( Figure 5) also did not improve the efficiency. 81,82 Jung et al 83 added a photoconducting carbazole-based polymer in the HBC/perylene solar cell to improve its efficiency. It was observed that the PCE of the device is dependent on the morphology of film.…”

Section: Hexabenzocoronene Dlcs In Pvsmentioning

confidence: 99%

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Liquid crystals in photovoltaics: a new generation of organic photovoltaics

Kumar

2016

Polym J

148

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This article presents an overview of the developments in the field of organic photovoltaics (PVs) with liquid crystals (LCs). A brief introduction to the PV and LC fields is given first, followed by application of various LCs in organic PVs. Details of LCs used in bilayer solar cells, bulk heterojunction solar cells and dye-sensitized solar cells have been given. All the liquid crystalline materials used in PVs are structured and the efficiency of solar cells is tabulated. Finally, an outlook into the future of this newly emerging, fascinating and exciting field of self-organizing supramolecular LC PV research is provided. Polymer Journal (2017) 49, 85-111; doi:10.1038/pj.2016.109; published online 9 November 2016 INTRODUCTIONFor the sustainable growth of the global economy, availability of cheap energy is essential. Our energy demand is increasing continuously to improve our lifestyle. At present, fossil energy sources are the primary sources for most of the world's current energy requirements and only a little is provided by hydropower, nuclear energy and biomass. The exponential growth of carbon dioxide level in the atmosphere owing to the burning of fossil fuels is leading to the threat of a universal climate change. Moreover, there will be limited availability of conventional energy sources in the long term. Future energy demand cannot be met with conventional sources of energy. Nuclear energy sources are one of the promising energy sources, but owing to their associated hazardousness and cost effectiveness, these energy sources does not appear to be socially acceptable universally. Moreover, nuclear fuel is also limited to tackle gigantic demand of energy. Despite several efforts, the problem of energy provision around the world remains unsolved, and there is a great need of finding alternative clean energy sources. To solve the energy crisis of the globe, exploitation of solar energy is undoubtedly the best answer. It is the most abundant inexhaustible source of regenerative energy. It is known since the evolution of life on the Earth that Mother Nature generates chemical energy from solar energy via photosynthesis. The supply of energy by Sun on Earth in an hour is more than that we use in a year. Therefore, only a fraction of solar energy is required to overcome our all energy requirements, if it can be converted to electric energy efficiently. The device that is developed to convert solar energy into electrical energy is known as photovoltaic (PV) solar cell.During the past 60 years, PV energy has been used as a promising candidate for energy devices because it is abundant, inexhaustible, cheap, straight to production ability and pollution-free that does not raise the green-house gases. The PV effect involves the generation of a photocurrent and photovoltage on absorption of light photons in a semiconductor. The three-step process, which is an

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Covalent Capture of Self‐Assembled Soft Materials

Gong

2012

Supramolecular Chemistry

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This chapter describes the covalent capture of soft materials with examples from covalently captured liquid crystals as well as gels of small molecules and polymers. The interplay of self‐assembly and the incorporation of various covalent bonds, including irreversible and covalent reversible bonds, are discussed. The development of basic, tunable association units allowing the systematic control of molecular assembly and covalent capture is speculated.

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Organic Thin Film Photovoltaic Devices from Discotic Materials

Abstract: Since the {irst demonstration of organic photo voltaic devices much progress has been made. Organic solar cells reach now power conversion efficiencies of up to

Cited by 48 publications

References 22 publications

Fluorenyl Hexa‐peri‐hexabenzocoronene‐Dendritic Oligothiophene Hybrid Materials: Synthesis, Photophysical Properties, Self‐Association Behaviour and Device Performance

Fluorenyl Hexa‐peri‐hexabenzocoronene‐Dendritic Oligothiophene Hybrid Materials: Synthesis, Photophysical Properties, Self‐Association Behaviour and Device Performance

Liquid crystals in photovoltaics: a new generation of organic photovoltaics

Covalent Capture of Self‐Assembled Soft Materials

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