Novel thiophene derivative hybrid composite solar cells

Swathi, S.; Ranjith, Kugalur Shanmugam; Kumar, Prajwal; Ramamurthy, Praveen C.

doi:10.1016/j.solmat.2011.09.021

Cited by 18 publications

(10 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent developments in organic electronics [1][2][3][4] indicate a broad scope for research to develop highly flexible, moisture-and oxygen-impermeable barrier materials. 5,6 Barrier materials have been extensively used in food and pharmaceutical packaging industries.…”

Section: Introductionmentioning

confidence: 99%

Flexible poly(vinyl alcohol-co-ethylene)/modified MMT moisture barrier composite for encapsulating organic devices

2013

Self Cite

View full text Add to dashboard Cite

Flexible, nano-composite moisture barrier films of poly(vinyl alcohol-co-ethylene) with surface modified montmorillonite fabricated by solution casting were used to encapsulate organic devices. The composite films were characterized by FTIR, UV-visible spectroscopy and SEM imaging. Thermal and mechanical properties of the composite films were studied by DSC and UTM. Calcium degradation test was used to determine the transmission rate of water vapour through the composite films, which showed a gradual reduction from y0.1 g m 22 day 21 to 0.0001 g m 22 day 21 with increasing modified montmorillonite loading in the neat copolymer. The increase in moisture barrier performance is attributed to the decreased water vapour diffusivity due to matrix-filler interactions in the composite. The accelerated aging test was carried out for non-encapsulated and encapsulated devices to evaluate the efficiency of the encapsulants.The encapsulated devices exhibited longer lifetimes indicating the efficacy of the encapsulant.

show abstract

Section: Introductionmentioning

confidence: 99%

Flexible poly(vinyl alcohol-co-ethylene)/modified MMT moisture barrier composite for encapsulating organic devices

2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…28 Additionally, DTCPA has shown promising results both as donor and acceptor for applications in organic photovoltaics. [29][30][31][32] The electrosprayed DTCPA exhibited various morphologies such as spike-sphere and only spikes when dissolved in various solvents, 33 and also exhibited barbed-wire nanofiber morphology when blended with poly(ethylene oxide). 34 DTCPA was also explored by thermally evaporating it at various deposition rates, thereby tuning the diode characteristics.…”

Section: Introductionmentioning

confidence: 99%

Structure and Morphology-Dependent Electrical Characteristics of Conjugated Organic Crystals Acquired by Various Growth Methods

Swathi

Ranjith

Khanum

et al. 2021

J. Electron. Mater.

Self Cite

View full text Add to dashboard Cite

Here, the effect of the organic conjugated small molecule crystal growth process on the evolution of the crystal morphology and consequent charge transport properties are studied. Evaluations are carried out on a donor-acceptor-donor structured organic small molecule, 7,9-di(thiophen-2-yl)-8Hcyclopenta[a]acenaphthylen-8-one) (DTCPA), which crystallizes in a monoclinic structure. Recrystallization of the DTCPA molecule is carried out by employing four growth methods via solvent evaporation through both concentrated and dilute solutions using a polar solvent, N-methyl-2-pyrrolidone. The four growth methods are slow evaporation of solvent from a dilute solution (SED) and a concentrated solution, quenching the hot concentrated solution, and slow cooling of hot concentrated solution. The morphological and optical studies demonstrated recrystallized particle size varying from 0.01 mm to 10 mm. The structural analysis revealed crystallite size from 30 nm to 160 nm. Current-voltage characterization and conductivity measurements indicate that these structural and morphological variations are critical factors in influencing and determining the electronic charge transport properties. The SED method results in relatively larger crystallites size and percent crystallinity, which leads to higher conductivity. Overall, by utilizing various growth methods for DTCPA, change in particle size, crystallite size, percent crystallinity, and optical absorption is assessed, which in turn affects the electrical properties.

show abstract

“…25 Other studies showed the effect of solvent evaporation on morphology, 26,15 pore formation, 27 microspheres 28,29 and molecular stacking. 33 Furthermore, properties of a single crystal DTCPA was evaluated, where two orders of increase in conductivity along with charge density analysis was observed. The organic small molecule studied here is a thiophene derivative (7, 9-di (thiophen-2-yl)-8H-cyclopenta[a]acenaphthylen-8-one) (DTCPA) having donor-acceptor-donor (DAD) 4 moieties.…”

Section: Introductionmentioning

confidence: 99%

Design and morphology control of a thiophene derivative through electrospraying using various solvents

Khanum

Ramamurthy

2015

RSC Adv.

Self Cite

View full text Add to dashboard Cite

In the present work, electrospraying of an organic molecule is carried out using various solvents, obtaining fibril structures along with a range of distinct morphologies. Solvent characteristics play a major role in achieving the morphology of the organic material. A thiophene derivative (7, 9-di (thiophen-2-yl)-8H-cyclopenta[a]acenaphthylen-8-one) (DTCPA) of donor-acceptordonor (DAD) architecture is used to study this solvent effect. Seven solvents with decreasing vapour pressure are selected for experiments. Electrospraying is conducted at a solution concentration of 1.5 wt % and a constant applied voltage of 15 kV. Gradual transformation in morphology of the electrospun product from spikes-sphere to only spikes is observed. A mechanism describing this transformation is proposed based on the electron micrograph analysis and XRD analysis. These data indicate that the morphological change is due to the synergistic effect of both vapour pressure and dielectric constant of the solvents. Through a reasonable control over the crystallites size and morphology along with supporting transformation mechanism theory, this study elucidates electrospraying as a prospective method for designing the architectures in organic electronics.

show abstract

Novel thiophene derivative hybrid composite solar cells

Cited by 18 publications

References 23 publications

Flexible poly(vinyl alcohol-co-ethylene)/modified MMT moisture barrier composite for encapsulating organic devices

Flexible poly(vinyl alcohol-co-ethylene)/modified MMT moisture barrier composite for encapsulating organic devices

Structure and Morphology-Dependent Electrical Characteristics of Conjugated Organic Crystals Acquired by Various Growth Methods

Design and morphology control of a thiophene derivative through electrospraying using various solvents

Contact Info

Product

Resources

About