Charge carrier mobility, photovoltaic, and electroluminescent properties of anthracene‐based conjugated polymers bearing randomly distributed side chains

Usluer, Özlem; Kästner, Christian; Abbas, Mamatimin; Ulbricht, Christoph; Cimrová, Věra; Wild, Andreas; Birckner, Eckhard; Tekin, Nalan; Sariciftci, Niyazi Serdar; Hoppe, Harald; Rathgeber, Silke; Egbe, Daniel Ayuk Mbi

doi:10.1002/pola.26133

Cited by 24 publications

(25 citation statements)

References 45 publications

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“…We chose 1 : 2 as the starting ratio, as it has been generally used in previous studies as the optimum ratio for the AnE-PVstat polymer. 5,9 We observed a much higher electron current compared to the hole current in OFET devices for this ratio. Thus, we nely tuned the polymer to PCBM ratio, in order to reach a similar current for electrons and holes.…”

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confidence: 69%

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Control of carrier mobilities for performance enhancement of anthracene-based polymer solar cells

et al. 2015

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High performance organic solar cells were realized using an anthracene-based polymer. Charge carrier mobilities of both electrons and holes in solvent annealed polymer and fullerene derivative mixtures were studied using organic field-effect transistors. Fine tuning of donor to acceptor ratios revealed optimum conditions for balanced mobilities, which led to a high power conversion efficiency (PCE) of 4.02% in the organic solar cells. A methanol wash approach further enhanced the PCE to 4.65%. This work demonstrates the importance of carrier transport control in optimizing the performance of polymer solar cells.Although polymer solar cells have a number of advantages over silicon based solar cells in terms of their low cost, light weight and exibility etc., one of the bottlenecks to their application is their relatively low power conversion efficiencies (PCEs). Recent advances in chemical and device engineering have pushed PCEs of polymer solar cells over 10%.1 However, for market applications, the PCE has to be further improved. The development of new materials and their integration into efficient device congurations have to be explored. One of the approaches is to fabricate tandem solar cells. Indeed, until now, the highest PCE reported for polymer solar cells was obtained using a tandem structure.2 In this conguration, two or more cells are stacked in series, thus the device open circuit voltage (V oc ) will be the sum of V oc achieved from each sub-cell. The absorption prole of the sub-cells should be complimentary in order to achieve the maximum possible short circuit current density (J sc ) from each sub-cell. Recently, identical active layers comprised of low band gap polymer were proposed with quite thin lms.3 However, for a large scale process at an industrial level thicker lms are preferred due to the requirements of homogeneity and robustness for high production yield. Therefore, both low and wider band gap polymers should be incorporated into tandem solar cells in each sub-cell, in this case, wider band gap polymers that yield high V oc are most useful. One such promising polymer is the anthracene-based PPV polymer. It has an optical band gap of about 2 eV, with a high oxidation potential, resulting in a generally high V oc in polymer solar cells when combined with [6,6]-phenyl-C 61 -butyric acid methyl ester (PCBM, classical). 4Several studies have been carried out to optimize device performance. Side chain variation has been shown to have a rather strong impact on the pi-pi stacking ability of the polymer backbone, and consequently on device performance. A PCE of 3.03% was achieved for the polymer with optimum side chain distribution, named AnE-PVstat.5 Fine tuning of macromolecular parameters such as molecular weight and polydispersity resulted in a PCE of 3.26%.6 Through the control of blend morphology, by solution concentration and PCBM weight fraction, a high PCE of 4.33% was recently achieved.7 Applying different fullerene derivatives as acceptors has been proposed, and signicant variat...

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“…A PCE of 3.03% was achieved for the polymer with optimum side chain distribution, named AnE-PVstat. 5 Fine tuning of macromolecular parameters such as molecular weight and polydispersity resulted in a PCE of 3.26%.…”

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Control of carrier mobilities for performance enhancement of anthracene-based polymer solar cells

et al. 2015

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“…The similarity of the EL and PL thin film spectra as well as their currentevoltage characteristics indicate that charge trapping does not play an important role in the EL process. The PCzE-PPV LED luminance efficiency of 2.6 cd A À1 , the power efficiency of 1.35 lm W À1 and the external quantum efficiency estimation of about 0.5% are much better than those of anthracenecontaining PPE-PPV LEDs with red-shifted EL (maxima at 600e620 nm) and belong to the higher ones of LEDs made of analogous PAE-PAVs and of other relatively efficient polymer LEDs of similar simple device configuration [5,14,22]. The obtained EL results on the non-optimized simple LEDs are interesting and promising for further polymer or device optimization.…”

Section: Electroluminescencementioning

confidence: 98%

“…PAnE-PPV with solely 2-ethylhexyl side chains exhibited a less tendency of aggregation due to bulky branched 2-ethylhexyls hindering intermolecular pep stacking [12,14].…”

Section: Thermal Propertiesmentioning

confidence: 99%

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New electroluminescent carbazole-containing conjugated polymer: Synthesis, photophysics, and electroluminescence

Cimrová

Ulbricht

Dzhabarov

et al. 2014

Polymer

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Effect of Side Chains on Charge Transport of Anthracene‐Based PPE–PPV Copolymers

Tinti

Sabir

Gazzano

et al. 2014

Macro Chemistry & Physics

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The variation of the drift mobility of positive and negative charge carriers in fi lms of anthracene-containing poly( p -phenylene-ethynylene)-alt-poly( p -phenylene-vinylene)s ( AnE-PVs ), differently substituted, is investigated as a function of the applied electric fi eld. Branched 2-ethylhexyl and linear alkoxy side chains of different lengths are considered, as well as well-defi ned and random distributions of lateral substituents. The same conditions are used both for the deposition of the polymer fi lms and for their characterization, which allows for the establishment of a clear relationship between the chemical structure and the charge carrier mobility. diodes (OLEDs) [ 5 ] are the key applications of conjugated polymers, and in general of π-conjugated organic materials. Charge transport properties constitute a major determining factor for the operation of these devices. High and balanced hole and electron mobilities are required for high performance in solar cells and the current fl owing between source and drain in an OFET is strictly related to charge carrier mobility ( μ ). Balanced charge transport is also required for high effi ciency of charge recombination in OLEDs. Given the strong impact of μ on the properties of any electronic device, the knowledge of how to tune the molecular structure of organic conjugated materials to achieve high mobility values is of prime importance, in addition to the other factors affecting the charge transport properties of organic fi lms (molecular packing, disorder, impurities, etc.).In this study, the drift mobility of positive and negative charge carriers in a series of six anthracene-containing poly( p -phenylene-ethynylene)-alt-poly( p -phenylenevinylene)s (AnE-PVs) is investigated and compared. AnE-PVs, with the anthracene unit between two triple bonds, are a relevant class of conjugated polymers, [ 6 ] exhibiting outstanding optoelectronic properties. Light-emitting diodes showing a turn-on voltages below 2 V [ 7 ] and solar cells exhibiting a state-of-art effi ciency of around 5%,

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Charge carrier mobility, photovoltaic, and electroluminescent properties of anthracene‐based conjugated polymers bearing randomly distributed side chains

Cited by 24 publications

References 45 publications

Control of carrier mobilities for performance enhancement of anthracene-based polymer solar cells

Control of carrier mobilities for performance enhancement of anthracene-based polymer solar cells

New electroluminescent carbazole-containing conjugated polymer: Synthesis, photophysics, and electroluminescence

Effect of Side Chains on Charge Transport of Anthracene‐Based PPE–PPV Copolymers

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