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Thickness dependent absorption and polaron photogeneration in poly-(2-metoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene-vinylene)
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10.1063/1.4729770
/content/aip/journal/jap/111/12/10.1063/1.4729770
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/12/10.1063/1.4729770
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Absorption coefficient spectra versus MEH-PPV film thickness recorded by Ocean Optics USB2000 spectrometer. The thickness dependence of absorption coefficient at λ = 500 nm—Inset 1. The schematic layout of the ITO/PEDOT:PSS/MEH-PPV/Al photodetector on a glass substrate—Inset 2.

Image of FIG. 2.
FIG. 2.

Absorption coefficient spectra versus MEH-PPV film thickness recorded by Agilent 8453 UV-Visible spectrometer. The thickness dependence of absorption coefficient λ = 500 nm—Inset 1. Optical power spectrum of the monochromator—Inset 2.

Image of FIG. 3.
FIG. 3.

Measured (green solid circles) and simulated photocurrent density spectra (red solid triangles for BR model, variable α, red open triangles for BR model, constant α, blue solid squares for MR model, variable α and blue open squares for MR model, constant α) of the ITO/PEDOT:PSS/MEH-PPV/Al photodetector with 35 nm film thickness under (a) Vb  = −3 V and (b) Vb  = −7 V.

Image of FIG. 4.
FIG. 4.

Measured (green solid circles) and simulated photocurrent density spectra (red solid triangles for BR model, variable α, red open triangles for BR model, constant α, blue solid squares for MR model, variable α and blue open squares for MR model, constant α) of the ITO/PEDOT:PSS/MEH-PPV/Al photodetector with 100 nm film thickness, under (a) Vb  = −3 V and (b) Vb  = −7 V.

Image of FIG. 5.
FIG. 5.

Measured (green solid circles) and BR simulated photocurrent density spectra (red solid triangles for variable α and red open triangles for constant α) of the ITO/PEDOT:PSS/MEH-PPV/Al photodetector with 215 nm film thickness, under (a) Vb  = −3 V and (b) Vb  = −7 V.

Image of FIG. 6.
FIG. 6.

Measured (green solid circles) and simulated photocurrent density spectra (red solid triangles for BR model, variable α and blue solid squares for MR model, variable α) of the ITO/PEDOT:PSS/MEH-PPV/Al photodetector with 215 nm film thickness, under (a) Vb  = −3 V and (b) Vb  = −7 V.

Image of FIG. 7.
FIG. 7.

The polaron photogeneration quantum efficiency θp versus electric field E simulated by BR model and corresponding Poole-Frenkel (P-F) fits derived for ITO/PEDOT:PSS/MEH-PPV/Al devices for three different MEH-PPV film thicknesses.

Image of FIG. 8.
FIG. 8.

The Poole-Frenkel b parameter dependence on MEH-PPV film thickness d. Open squares represent the b values obtained for 35 nm, 100 nm, and 215 nm thick films. The first derivative of the b(d) function showing the pronounced b change with d for small film thicknesses—Inset.

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/content/aip/journal/jap/111/12/10.1063/1.4729770
2012-06-28
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thickness dependent absorption and polaron photogeneration in poly-(2-metoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene-vinylene)
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/12/10.1063/1.4729770
10.1063/1.4729770
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