Improvements of fill factor in solar cells based on blends of polyfluorene copolymers as electron donors

Gadisa, Abay; Zhang, Fengling; Sharma, Deepak; Svensson, Mattias; Andersson, Mats R.; Inganäs, Olle

doi:10.1016/j.tsf.2006.08.043

Cited by 40 publications

(28 citation statements)

References 30 publications

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“…Charge transport has previously been shown to have a large influence on device performance, and in particular the fill factor (FF) of a current density-voltage (J-V) curve. [24,25] The fill factor limits the maximum power that can be achieved from a device and is optimized by high charge mobility and efficient collection of free charge carriers at the electrodes. [24] The J-V characteristics of P3HT:PCBM devices made from P3HT-13 to P3HT-121 (active layer thicknesses $170nm) were measured under simulated solar irradiation (Air Mass 1.5, 50 mW cm À2 ).…”

Section: Resultsmentioning

confidence: 99%

“…[24,25] The fill factor limits the maximum power that can be achieved from a device and is optimized by high charge mobility and efficient collection of free charge carriers at the electrodes. [24] The J-V characteristics of P3HT:PCBM devices made from P3HT-13 to P3HT-121 (active layer thicknesses $170nm) were measured under simulated solar irradiation (Air Mass 1.5, 50 mW cm À2 ). The photovoltaic performance characteristics for sets of similar devices as a function of polymer MW are displayed in Figure …”

Section: Resultsmentioning

confidence: 99%

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The Effect of Poly(3‐hexylthiophene) Molecular Weight on Charge Transport and the Performance of Polymer:Fullerene Solar Cells

Ballantyne

Chen

Dane

et al. 2008

Adv Funct Materials

258

277

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The time‐of‐flight method has been used to study the effect of P3HT molecular weight (Mn = 13–121 kDa) on charge mobility in pristine and PCBM blend films using highly regioregular P3HT. Hole mobility was observed to remain constant at 10−4 cm2V−1s−1 as molecular weight was increased from 13–18 kDa, but then decreased by one order of magnitude as molecular weight was further increased from 34–121 kDa. The decrease in charge mobility observed in blend films is accompanied by a change in surface morphology, and leads to a decrease in the performance of photovoltaic devices made from these blend films.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The Effect of Poly(3‐hexylthiophene) Molecular Weight on Charge Transport and the Performance of Polymer:Fullerene Solar Cells

Ballantyne

Chen

Dane

et al. 2008

Adv Funct Materials

258

277

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“…This particular relation has been widely used for a description of transport properties of various materials, we mention here just some recent references. [12][13][14][15][16][17][18] In some papers a comparative analysis of the data using both the GDM and DG model was carried out and it was found that the DG model provides more coherent description of charge transport. 12,16,17 Still, a proper experimental test of the DG model is far from completed.…”

Section: -11mentioning

confidence: 99%

Charge carrier transport in molecularly doped polycarbonate as a test case for the dipolar glass model

Новиков

Tyutnev

2013

The Journal of Chemical Physics

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We present the results of Monte-Carlo simulations of the charge carrier transport in a disordered molecular system containing spatial and energetic disorders using the dipolar glass model. Model parameters of the material were chosen to fit a typical polar organic photoconductor polycarbonate doped with 30% of aromatic hydrazone, whose transport properties are well documented in literature. Simulated carrier mobility demonstrates a usual Poole-Frenkel field dependence and its slope is very close to the experimental value without using any adjustable parameter. At room temperature transients are universal with respect to the electric field and transport layer thickness. At the same time, carrier mobility does not depend on the layer thickness and transients develop a well-defined plateau where the current does not depend on time, thus demonstrating a non-dispersive transport regime. Tails of the transients decay as power law with the exponent close to -2. This particular feature indicates that transients are close to the boundary between dispersive and non-dispersive transport regimes. Shapes of the simulated transients are in very good agreement with the experimental ones. In summary, we provide a first verification of a self-consistency of the dipolar glass transport model, where major transport parameters, extracted from the experimental transport data, are then used in the transport simulation, and the resulting mobility field dependence and transients are in very good agreement with the initial experimental data.

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“…These attempts include different side chains, [69] solvent mixtures [72] and ternary blends of two PFTBTs combined with PCBM. [73] . In another approach to improve the morphology of the PFTBT/PCBM blend, PFTBT analogues were synthesised with high molecular weights (M w ¼ 120 kg Á mol À1 ).…”

Section: Parameters Determining the Morphology Formation Of The Photomentioning

confidence: 99%

On the Importance of Morphology Control in Polymer Solar Cells

Bavel

Veenstra

Loos

2010

Macromol. Rapid Commun.

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Nanostructured polymer-based solar cells (PSCs) have emerged as a promising low-cost alternative to conventional inorganic photovoltaic devices and are now a subject of intensive research both in academia and industry. For PSCs to become practical efficient devices, several issues should still be addressed, including further understanding of their operation and stability, which in turn are largely determined by the morphological organisation in the photoactive layer. The latter is typically a few hundred nanometres thick film and is a blend composed of two materials: the bulk heterojunction consisting of the electron donor and the electron acceptor. The main requirements for the morphology of efficient photoactive layers are nanoscale phase segregation for a high donor/acceptor interface area and hence efficient exciton dissociation, short and continuous percolation pathways of both components leading through the layer thickness to the corresponding electrodes for efficient charge transport and collection, and high crystallinity of both donor and acceptor materials for high charge mobility. In this paper, we review recent progress of our understanding on how the efficiency of a bulk heterojunction PSC largely depends on the local nanoscale volume organisation of the photoactive layer.

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Improvements of fill factor in solar cells based on blends of polyfluorene copolymers as electron donors

Cited by 40 publications

References 30 publications

The Effect of Poly(3‐hexylthiophene) Molecular Weight on Charge Transport and the Performance of Polymer:Fullerene Solar Cells

The Effect of Poly(3‐hexylthiophene) Molecular Weight on Charge Transport and the Performance of Polymer:Fullerene Solar Cells

Charge carrier transport in molecularly doped polycarbonate as a test case for the dipolar glass model

On the Importance of Morphology Control in Polymer Solar Cells

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