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Extension of the spectral responsivity of the photocurrent in solution-processed small molecule composite via a charge transfer excitation
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FIG. 1.

Normalized steady-state absorption (a) and photoconductive responsivity and (b) spectra of the DPA:Rubrene, DPA:PCBM, Rubrene:PCBM, and DPA:Rubrene: PCBM composite films.

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FIG. 2.

PIA spectrum of a Rubrene:PCBM composite film using (a) above bandgap (400 nm) and (b) below bandgap (800 nm) excitation.

Image of FIG. 3.

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FIG. 3.

PIA decay dynamics of a Rubrene:PCBM composite film excited at 400 nm and 800 nm probed at 860 nm. The solid line represents the bi-exponential fit to the experimental data.

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/content/aip/journal/apl/99/16/10.1063/1.3655681
2011-10-20
2014-04-19

Abstract

Incorporating [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) in solution-processed composites comprising the two small molecular semiconductors 9,10-Diphenylanthracene (DPA) and 5,6,11,12-tetraphenylnaphthacene (Rubrene) extends significantly the onset wavelength of the steady-state photoconductivity from 610 nm in the pristine DPA:Rubrene composite to 900 nm in the DPA:Rubrene:PCBM composite. The experimental data indicate carrier generation in the near IRspectral region arising from inter-molecular charge transfer (IMCT) excitation that potentially could be useful for extending solar radiation light harvesting. Pump/probe photoinduced absorption (PIA) measurements indicate instantaneous carrier generation at sub-band-gap photon energies, confirming the viability of IMCT excitations as the underlying carrier generation mechanism at the near IRspectral region.

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Scitation: Extension of the spectral responsivity of the photocurrent in solution-processed small molecule composite via a charge transfer excitation
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/16/10.1063/1.3655681
10.1063/1.3655681
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