scholarly journals Hybrid Optoelectronic and Photovoltaic Materials based on Silicon Nanocrystals and Conjugated Polymers

10.5772/15270 ◽  
2011 ◽  
Author(s):  
Vladimir Svrcek
Keyword(s):  
Conjugated Polymers ◽  
Silicon Nanocrystals ◽  
Photovoltaic Materials

Effect of fluorination and symmetry on the properties of polymeric photovoltaic materials based on an asymmetric building block

RSC Advances ◽  
2016 ◽  
Vol 6 (93) ◽  
pp. 90051-90060 ◽  
Author(s):  
Xiaochen Wang ◽  
Ailing Tang ◽  
Yu Chen ◽  
Asif Mahmood ◽  
Jianhui Hou ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Building Block ◽  
Energy Levels ◽  
Building Blocks ◽  
Asymmetric Building ◽  
Photovoltaic Materials

Introducing fluorine on benzothiadiazole unit significantly influenced the properties of DTPa and BTs based conjugated polymers by tuning the energy levels and symmetry of the building blocks.

Photovoltaic poly(rod-coil) polymers based on benzodithiophene-centred A–D–A type conjugated segments and dicarboxylate-linked alkyl non-conjugated segments

RSC Advances ◽  
2016 ◽  
Vol 6 (28) ◽  
pp. 23300-23309 ◽  
Author(s):  
Xuan Xiang ◽  
Wei Shao ◽  
Long Liang ◽  
Xue-Qiang Chen ◽  
Fu-Gang Zhao ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
New Class ◽  
Photovoltaic Materials ◽  
Molecular Compounds

Different from the well-studied photovoltaic conjugated polymers and small molecular compounds, poly(rod-coil) polymers are emerging as a new class of photovoltaic materials.

Design of asymmetric benzodithiophene based wide band-gap conjugated polymers toward efficient polymer solar cells promoted by a low boiling point additive

2018 ◽  
Vol 6 (11) ◽  
pp. 2806-2813 ◽  
Author(s):  
Yonghai Li ◽  
Linrui Duan ◽  
Deyu Liu ◽  
Weichao Chen ◽  
Xichang Bao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Conjugated Polymers ◽  
Band Gap ◽  
Boiling Point ◽  
Polymer Solar Cells ◽  
Wide Band ◽  
Wide Band Gap ◽  
Photovoltaic Materials

Here, we reported two conjugated photovoltaic materials based on asymmetric benzodithiophene units and presented a low boiling point additive to optimize devices.

Phosphorous and Boron Doped Colloidal Silicon Nanocrystals in Conjugated Co-polymers

2008 ◽  
Vol 1102 ◽  
Author(s):  
Vladimir Svrcek ◽  
Hiroyuki Fujiwara ◽  
Michio Kondo
Keyword(s):  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Silicon Nanocrystals ◽  
Organic Solar Cell ◽  
Electrochemical Etching ◽  
Solar Cell Efficiency ◽  
Cell Efficiency ◽  
Boron Doped ◽  
Environmental Friendly ◽  
Photoconductivity Response

AbstractOne-way to improve organic solar cell efficiency is blending conjugated polymer with a second nanocomposite. We report on blending of freestanding boron- and phosphorous-doped environmental friendly silicon nanocrystals (Si-ncs) with two conjugated polymers i.e. (poly(3-hexylthiophene) (P3HT) and poly[methoxy-ethylexyloxy-phenylenevinilene] (MEH PPV)). The electrochemical etching and pulverization of doped porous silicon films are used for fabrication of photesensitive Si-ncs/polymers blends. Processing of Si-ncs dispersed in polymers allows simple tuning of the Si-ncs concentrations in the blends. The blends with high Si-ncs concentrations are prepared and opto-electric properties are compared and discussed. Both types of polymers containing doped Si-ncs showed a photoconductivity response under illumination AM1.5 at ambient temperature and atmosphere.

Electronic structure studies of conducting polymers by electron energy-loss spectroscopy

1996 ◽  
Vol 54 ◽  
pp. 160-161
Author(s):  
J. Fink
Keyword(s):  
Electronic Structure ◽  
Conducting Polymers ◽  
Conjugated Polymers ◽  
Electron Acceptors ◽  
Electron Donors ◽  
Light Emitting ◽  
One Dimensional ◽  
New Class ◽  
Electrical Conductivities ◽  
Electron Energy Loss

Conducting polymers comprises a new class of materials achieving electrical conductivities which rival those of the best metals. The parent compounds (conjugated polymers) are quasi-one-dimensional semiconductors. These polymers can be doped by electron acceptors or electron donors. The prototype of these materials is polyacetylene (PA). There are various other conjugated polymers such as polyparaphenylene, polyphenylenevinylene, polypoyrrole or polythiophene. The doped systems, i.e. the conducting polymers, have intersting potential technological applications such as replacement of conventional metals in electronic shielding and antistatic equipment, rechargable batteries, and flexible light emitting diodes.Although these systems have been investigated almost 20 years, the electronic structure of the doped metallic systems is not clear and even the reason for the gap in undoped semiconducting systems is under discussion.

Photoluminescence behavior of silicon nanocrystals: Role of surface chemistry and size

2008 ◽  
Author(s):  
Anoop Gupta ◽  
Folarin Erogbogbo ◽  
Mark T. Swihart ◽  
Hartmut Wiggers
Keyword(s):  
Surface Chemistry ◽  
Silicon Nanocrystals ◽  
Photoluminescence Behavior

Pump-Probe Measurements Using Silicon Nanocrystal Waveguides

2003 ◽  
Vol 770 ◽  
Author(s):  
Nathanael Smith ◽  
Max J. Lederer ◽  
Marek Samoc ◽  
Barry Luther-Davies ◽  
Robert G. Elliman
Keyword(s):  
Probe Beam ◽  
Time Resolution ◽  
Pump Beam ◽  
Silicon Nanocrystals ◽  
Continuous Wave ◽  
Optical Gain ◽  
Optical Pump ◽  
Time Resolved ◽  
Pump Probe ◽  
Probe Measurements

AbstractOptical pump-probe measurements were performed on planar slab waveguides containing silicon nanocrystals in an attempt to measure optical gain from photo-excited silicon nanocrystals. Two experiments were performed, one with a continuous-wave probe beam and a pulsed pump beam, giving a time resolution of approximately 25 ns, and the other with a pulsed pump and probe beam, giving a time resolution of approximately 10 ps. In both cases the intensity of the probe beam was found to be attenuated by the pump beam, with the attenuation increasing monotonically with increasing pump power. Time-resolved measurements using the first experimental arrangement showed that the probe signal recovered its initial intensity on a time scale of 45-70 μs, a value comparable to the exciton lifetime in Si nanocrystals. These data are shown to be consistent with an induced absorption process such as confined carrier absorption. No evidence for optical gain was observed.

Oriented Luminescent Nanostructures From Single Molecules Of Conjugated Polymers

2003 ◽  
Vol 771 ◽  
Author(s):  
Adosh Mehta ◽  
Pradeep Kumar ◽  
Jie Zheng ◽  
Robert M. Dickson ◽  
Bobby Sumpter ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Polarization Anisotropy ◽  
Emission Pattern ◽  
Spectral Signatures ◽  
Dipole Emission ◽  
Ink Jet ◽  
Molecular Scale ◽  
Jet Printing ◽  
Photochemical Stability ◽  
Printing Techniques

AbstractDipole emission pattern imaging experiments on single chains of common conjugated polymers (solubilized poly phenylene vinylenes) isolated by ink-jet printing techniques have revealed surprising uniformity in transition moment orientation perpendicular to the support substrate. In addition to uniform orientation, these species show a number of striking differences in photochemical stability, polarization anisotropy,[1] and spectral signatures[2] with respect to similar (well-studied) molecules dispersed in dilute thin-films. Combined with molecular mechanics simulation, these results point to a structural picture of a folded macromolecule as a highly ordered cylindrical nanostructure whose long-axis (approximately collinear with the conjugation axis) is oriented, by an electrostatic interaction, perpendicular to the coverglass substrate. These results suggest a number of important applications in nanoscale photonics and molecular-scale optoelectronics.

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