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Design length scales for carbon nanotube photoabsorber based photovoltaic materials and devices
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10.1063/1.4805597
/content/aip/journal/jap/113/20/10.1063/1.4805597
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/20/10.1063/1.4805597

Figures

Image of FIG. 1.
FIG. 1.

Optical absorption spectrum of (a) poly(9,9-dioctylfluorene, 2,7-diyl) (PFO) wrapped highly mono-dispersed (7, 5) film (red solid) and simulated/fit optical absorption spectrum of pure (7, 5) film (blue dash) and (b) Bundles of highly mono-dispersed (6, 5) nanotubes (red solid) and simulated optical absorption spectrum of pure (6, 5) film (blue dash).

Image of FIG. 2.
FIG. 2.

AM1.5G solar spectrum (black solid); optical transitions at energies (red circles); (blue triangles), and (green squares).

Image of FIG. 3.
FIG. 3.

Schematic illustrating hexagonally packed nanotube fiber morphology and possible intra- and inter-nanotube routes for exciton migration.

Image of FIG. 4.
FIG. 4.

AM1.5G solar spectrum (grey solid) and optimized natural absorption spectrum with mixture of chiralities in strongly coupled film (red solid) and polymer wrapped nanotubes film (blue dash). Mixture of chiralities are (5, 4) 7.8%, (6, 4) 15.6%, (6, 5) 4.7%, (7, 2) 18.7%, (7, 3) 5.7%, (8, 1) 24.9%, (8, 3) 6.4%, (9, 1) 8.4%, and (11, 0) 7.8%.

Image of FIG. 5.
FIG. 5.

Spatial distribution of 1000 excitons in (a) x-direction (within the cross-section of the fiber) and strong coupling, (b) z-direction (along the length of the fiber) and strong coupling, (c) x-direction and moderate coupling, and (d) z-direction and moderate coupling, at 10 fs (black up triangles), 100 fs (red down triangles), 1 ps (blue diamonds), and 10 ps (green left triangles). (e) Kurtosis as a function of time in strong (black squares) and moderate coupling (red circles). (f) Kurtosis as a function of relative concentration of the (7, 5) and the (9, 7) nanotubes after 10 ps.

Image of FIG. 6.
FIG. 6.

Evolution of exciton population in mixtures of (7, 5) (black solid), (7, 6) (red dash), (8, 6) (green dot), (8, 7) (blue dash dot), and (9, 7) (wine short dot) chiralities at a ratio of 0.16: 0.22: 0.29: 0.25: 0.08, respectively, as a function of time following photoexcitation of a (7, 5) nanotube in (a) strong and (b) moderate coupling.

Image of FIG. 7.
FIG. 7.

Photoluminescence spectra of isolated and coupled nanotubes. Isolated nanotubes in solution (blue dot) and embedded in poly(methyl methacrylate) (PMMA) at a 1000:1 ratio of PMMA:nanotubes by weight (red solid). Coupled nanotubes at a 1:1 ratio of PFO:nanotubes by weight (black dash). Excitation at 658 nm (corresponding to the of the (7, 5) and (7, 6) nanotubes). Isolated and coupled nanotube spectra normalized at 1050 and 1330 nm, respectively.

Image of FIG. 8.
FIG. 8.

Effects of polydispersity. (a) Radial exciton diffusion length as a function of the relative concentration of the (7, 5) and the (9, 7) nanotubes in strong coupling after 10 ps. (b) Evolution of exciton population with a ratio of 92%:8% of (7, 5) (blue dash) to (9, 7) (red solid).

Image of FIG. 9.
FIG. 9.

The characteristic radial distance across which an exciton migrates in a fiber of strong coupled (7, 5) semiconducting nanotubes until that exciton is quenched by a spurious metallic nanotube, as a function of the relative abundance of metallic nanotubes.

Image of FIG. 10.
FIG. 10.

The characteristic radial distance across which an exciton migrates in a fiber of (7, 5) semiconducting nanotubes until that exciton is quenched by a defect, as a function of defect concentration in strong (black squares) and moderate (red triangles) coupling.

Image of FIG. 11.
FIG. 11.

Schematic illustrating nanotube fiber morphology in a bilayered nanotube/acceptor heterojunction. , , and denote the characteristic out-of-plane component of the orientation of a fiber, the fiber diameter, and the thickness of the nanotube layer, respectively.

Tables

Generic image for table
Table I.

Radial exciton diffusion length () and thin film absorption length ( ) in nm as a function of chiral composition (%), assuming 100% semiconducting purity,  = 500 nm, and strong coupling.

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/content/aip/journal/jap/113/20/10.1063/1.4805597
2013-05-28
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Design length scales for carbon nanotube photoabsorber based photovoltaic materials and devices
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/20/10.1063/1.4805597
10.1063/1.4805597
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