Mobility and photovoltaic performance studies on polymer blends: effects of side chains volume fraction

Adam, Getachew; Pivrikas, Almantas; Ramil, Alberto Montaigne; Tadesse, Sisay; Yohannes, Teketel; Sariciftci, Niyazi Serdar; Egbe, Daniel Ayuk Mbi

doi:10.1039/c0jm02668a

Cited by 41 publications

(25 citation statements)

References 76 publications

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“…Adam et al32 demonstrated that mixing of (poly{1,4‐ (2,5‐dioctyloxy)‐phenyleneethynylene‐2,5‐thiophenylenevinylene‐1,4‐[(5‐(2‐ethylhexyl)oxy)‐2‐methyloxy]phenylenevinylen (DO‐PThE1‐PPV2) and poly{1,4‐(5‐[(2‐ethylhexyl)‐oxy]‐2‐methoxy)‐phenyleneethynylene‐2,5‐thiophenylenevinylene‐1,4‐[(5‐(2‐ethylhexyl)oxy)‐2‐methyloxy] phenylenevinylene} (MEH‐PThE1‐PPV2), consisting of the same conjugated backbone but different types and volume fraction of alkoxy side chains on the phenylene ethynylene unit, blended in PCBM resulted in a slight improvement over the binary references. This improvement was attributed to an enhanced charge carrier mobility in the DO‐PThE1‐PPV2:MEH‐PThE1‐PPV2 mixture (μ DO : MEH h = 2.6 × 10 − 4 cm 2 /Vs) as compared to the individual polymers (μ DO : PThE 1 h = 1.8 × 10 − 5 cm 2 /Vs, μ MEH − PThE 1 h = 2 × 10 − 6 cm 2 /Vs).…”

Section: Review Of Experimental Resultsmentioning

confidence: 99%

Organic Ternary Solar Cells: A Review

et al. 2013

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Recently, researchers have paid a great deal of attention to the research and development of organic solar cells, leading to a breakthrough of over 10% power conversion efficiency. Though impressive, further development is required to ensure a bright industrial future for organic photovoltaics. Relatively narrow spectral overlap of organic polymer absorption bands within the solar spectrum is one of the major limitations of organic solar cells. Among different strategies that are in progress to tackle this restriction, the novel concept of ternary organic solar cells is a promising candidate to extend the absorption spectra of large bandgap polymers to the near IR region and to enhance light harvesting in single bulk-heterojunction solar cells. In this contribution, we review the recent developments in organic ternary solar cell research based on various types of sensitizers. In addition, the aspects of miscibility, morphology complexity, charge transfer dynamics as well as carrier transport in ternary organic composites are addressed.

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Section: Review Of Experimental Resultsmentioning

confidence: 99%

Organic Ternary Solar Cells: A Review

et al. 2013

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“…27,28 The experiment was designed in our lab using a nanosecond laser (OBB OL-401), a function generator and a digital oscilloscope integrated together, operated using a customized Lab-view program. 27,28 The experiment was designed in our lab using a nanosecond laser (OBB OL-401), a function generator and a digital oscilloscope integrated together, operated using a customized Lab-view program.…”

Section: Methodsmentioning

confidence: 99%

Improved performance by morphology control via fullerenes in PBDT-TBT-alkoBT based organic solar cells

et al. 2015

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In this work, we report improved performance by controlling morphology using different fullerene derivatives in poly{2-octyldodecyloxy-benzo[1,2-b;3,4-b]dithiophene-alt-5,6-bis(dodecyloxy)-4,7di(thieno[3,2-b]thiophen-2-yl)-benzo[c][1,2,5]thiadiazole} (PBDT-TBT-alkoBT) based organic solar cells.PC 60 BM and PC 70 BM fullerenes were used to investigate the characteristic changes in morphology and device performance. Fullerenes affect device efficiency by changing the active layer morphology.PC 70 BM with broader absorption than PC 60 BM resulted in reduced device performance which was elucidated by the intermixed granular morphology separating each larger grain in the PC 70 BM/polymer composite layer which created a higher density of traps. However after adding additive 1,8-diiodooctane (DIO), a fibrous morphology was observed due to the reduced solubility of the polymer and increased solubility of PC 70 BM in chloroform. The fibrous morphology improved charge transport leading to an increase in overall device performance. Atomic force microscopy (AFM), photo-induced charge extraction by linearly increasing voltage (photo-CELIV), and Kelvin probe force microscopy (KPFM) were used to investigate the nanoscale morphology of the active layer with different fullerene derivatives. For the PC 60 BM based active layer, AFM images revealed a dense fibrous morphology and more distinct fibrous morphology was observed by adding DIO. The PC 70 BM based active layer only exhibited an intermixed granular morphology instead of a fibrous morphology observed in the PC 60 BM based active layer. However, addition of DIO into the PC 70 BM based active layer led to fibrous morphology. When additive DIO was not used, a wider distribution of surface potential was observed for PC 70 BM than the PC 60 BM based active layer by KPFM measurements, indicating that polymer and fullerene domains are separated. When DIO was used, a narrower distribution of surface potential for both PC 70 BM and PC 60 BM based active layers was observed. Photo-CELIV experiments showed larger extracted charge carrier density and mobility in the PC 70 BM/DIO film. Fig. 1 (a) Molecular structure, (b) absorbance spectrum, and (c) cyclic voltammograms of PBDT-TBT-alkoBT thin films. J. Mater. Chem. A This journal is

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“…Compared with binary OSCs, ternary systems containing two donors and one acceptor (or one donor and two acceptors) can broaden the absorption range of active layers through complementary absorption of two donors, thereby providing a potentially effective route in achieving high short‐circuit current density ( J sc ) and thus high efficiency . On the other hand, comparing with tandem solar cell structures by using two binary layers, ternary system in one active layer can also exceed the performance of binary solar cells while maintaining simplicity of single active‐layer processing step.…”

Section: Summary Of Photovoltaic Parameters Of Solar Cells With Diffementioning

confidence: 99%

Synergistic Effect of Polymer and Small Molecules for High‐Performance Ternary Organic Solar Cells

et al. 2014

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Mobility and photovoltaic performance studies on polymer blends: effects of side chains volume fraction

Cited by 41 publications

References 76 publications

Organic Ternary Solar Cells: A Review

Organic Ternary Solar Cells: A Review

Improved performance by morphology control via fullerenes in PBDT-TBT-alkoBT based organic solar cells

Synergistic Effect of Polymer and Small Molecules for High‐Performance Ternary Organic Solar Cells

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