Towards optimization of device performance in conjugated polymer photovoltaics: Charge generation, transfer and transport in poly(p-phenylene-vinylene) polymer heterojunctions

Chasteen, Stephanie V.; Sholin, Veronica; Carter, Sue A.; Rumbles, Garry

doi:10.1016/j.solmat.2008.01.014

Cited by 29 publications

(20 citation statements)

References 55 publications

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“…1 shows the FT-IR spectra for the prepared PT/Ag nanocomposite and pure polythiophene PT. The characteristic peaks for PT at 1210, 1040, 790, 710 and 620 cm -1 which are assigned to C-H bending, C-H in-plane deformation, C-H out of plane deformation, C-S bending and C-S-C ring deformation [18,35,36] respectively are shown in fig. 1.…”

Section: Source Meter Smu Instrumentmentioning

confidence: 99%

Highly dendritic polythiophene/silver (PT/Ag) nanocomposite for solar energy applications

Zahran

Mossad

Elhalawany³

2019

Egypt. J. Chem.

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P OLYTHIOPHENE/SILVER (PT/Ag) nanocomposite has been synthesized and characterized.Morphological studies have been made to elucidate the structure of the formed nanocomposite. The morphological studies revealed that the formed nancomposite is highly dendritic forming tree like structure. A bulk heterojunction solar cell (BHJSC) has been built using the prepared nanocomposite as photo active layer. The solar cell parameters such as open circuit voltage Voc, short circuit current Isc and fill factor FF have been determined via current-voltage I-V characteristic. The maximum power conversion efficiency (PCE) obtained from I-V characteristic was 14.2 % which is much higher than that obtained from other commercial polythiophene based solar cells (SC). The enhanced PCE was attributed to the superior highly dendritic structure of the formed nanocomposite which provides charge transfer (CT) pathways and facilitates separation of the formed excitons into free electrons and holes. As far as we know none of these characteristics have been reached before in the open literature for PT based solar cells.

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Section: Source Meter Smu Instrumentmentioning

confidence: 99%

Highly dendritic polythiophene/silver (PT/Ag) nanocomposite for solar energy applications

Zahran

Mossad

Elhalawany³

2019

Egypt. J. Chem.

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“…[16][17][18][19] Similar utilization in synthetic MCMMs, if possible, can lead to novel mechanisms of solar energy conversion 20,21 and sensor development. Detailed spectroscopic studies of MCMM are needed to explore these possibilities.…”

Section: -15mentioning

confidence: 99%

Multistep Quantum Master Equation Theory for Response Functions in Four Wave Mixing Electronic Spectroscopy of Multichromophoric Macromolecules

Jang¹

2012

Bulletin of the Korean Chemical Society

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This work provides an alternative derivation of third order response functions in four wave mixing spectroscopy of multichromophoric macromolecular systems considering only single exciton states. For the case of harmonic oscillator bath linearly and diagonally coupled to exciton states, closed form expressions showing all the explicit time dependences are derived. These expressions can provide more solid physical basis for understanding 2-dimensional electronic spectroscopy signals. For more general cases of system-bath coupling, the quantum master equation (QME) approach is employed for the derivation of multistep time evolution equations for Green function-like operators. Solution of these equations is feasible at the level of 2nd order non-Markovian QME, and the new approach can account for inter-exciton coupling, dephasing, relaxation, and non-Markovian effects in a consistent manner. Key Words : Four wave mixing, Response function, Multichromophoric macromolecule IntroductionElectronic excitation is the outcome of correlated motion of electrons and is fundamentally quantum mechanical. When they are put together at nanometer length scale, each excitation loses its individuality and coherent superposition of those excitations, excitons, can be formed. This is possible even without physical contacts between chromophores because of long range characteristics of Coulomb interactions in particular. Thus, the energetics and the dynamics of delocalized excitons in so called multichromophoric macromolecule (MCMM) often result in optical properties that are distinctively different from those of individual chromophores. Well known examples of such MCMMs are photosynthetic light harvesting complexes, 1-4 conjugated polymers, 5-10 and dendrimers. 11-15Excitons in these MCMMs are tunable but fragile, which are being utilized positively for efficient and robust collection/ transfer of excitons in natural photosynthetic light harvesting complexes. [16][17][18][19] Similar utilization in synthetic MCMMs, if possible, can lead to novel mechanisms of solar energy conversion 20,21 and sensor development. Detailed spectroscopic studies of MCMM are needed to explore these possibilities.In general, spectroscopic study of MCMM is difficult because of broad range of dynamical time scales and the large number of structural/energetic degrees of freedom. In understanding how their optical properties reflect the molecular level structural and dynamical details, conventional linear spectroscopy is severely limited. Nonlinear spectroscopy of MCMM has an important role to play in this regard. [22][23][24][25] Indeed, recent progress in 2-dimensional electronic spectroscopy (2DES) [26][27][28][29] made it possible to identify quantum coherence lasting up to 500 fs in photosynthetic light harvesting complexes despite significant amount of disorder and fluctuations. Theoretical modelings of these 2DES signals have been made, 30-34 but clear understanding of the origins and effects of the coherent quantum beating is not available yet. This mo...

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“…On the other hand, several poly(p-phenylenevinylene)-, fluorene-, carbazole- and thiophene-based conjugated polymers (among others) have been employed as active layers in OPVs [ 20 , 21 , 22 ]. To date, polythiophene derivatives, including the regioregular poly(3-hexylthiophene) (P3HT), are among the most commonly employed electron donors in combination with the highly soluble fullerene molecules (PCBM) as electron acceptors for OPVs under the BHJ architecture; their use extends to thin film transistors, light emitting diodes, electrochromic windows and sensors [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Photophysical Study of Polymer-Based Solar Cells with an Organo-Boron Molecule in the Active Layer

et al. 2015

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Our group previously reported the synthesis of four polythiophene derivatives (P1–P4) used for solar cells. The cells were prepared under room conditions by spin coating, leading to low efficiencies. However, after the addition of 6-nitro-3-(E)-3-(4-dimethylaminophenyl)allylidene)-2,3-dihydrobenzo[d]-[1,3,2] oxazaborole (M1) to their active layers, the efficiencies of the cells showed approximately a two-fold improvement. In this paper, we study this enhancement mechanism by performing ultrafast transient absorption (TA) experiments on the active layer of the different cells. Our samples consisted of thin films of a mixture of PC61BM with the polythiophenes derivatives P1–P4. We prepared two versions of each sample, one including the molecule M1 and another without it. The TA data suggests that the efficiency improvement after addition of M1 is due not only to an extended absorption spectrum towards the infrared region causing a larger population of excitons but also to the possible creation of additional channels for transport of excitons and/or electrons to the PC61BM interface.

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Towards optimization of device performance in conjugated polymer photovoltaics: Charge generation, transfer and transport in poly(p-phenylene-vinylene) polymer heterojunctions

Cited by 29 publications

References 55 publications

Highly dendritic polythiophene/silver (PT/Ag) nanocomposite for solar energy applications

Highly dendritic polythiophene/silver (PT/Ag) nanocomposite for solar energy applications

Multistep Quantum Master Equation Theory for Response Functions in Four Wave Mixing Electronic Spectroscopy of Multichromophoric Macromolecules

Photophysical Study of Polymer-Based Solar Cells with an Organo-Boron Molecule in the Active Layer

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