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Determination of the interface -hole density in a blue-emitting organic semiconductor diode by electromodulated absorption spectroscopy
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10.1063/1.3467469
/content/aip/journal/apl/97/11/10.1063/1.3467469
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/11/10.1063/1.3467469
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic energy alignment at the PEDT:PSSH/TFB interface. (a) UPS results from the single heterojunction. (b) EA results from the completed device. One division corresponds to 1 eV.

Image of FIG. 2.
FIG. 2.

EA spectra of the ITO/PEDT:PSSM/TFB/Ca diodes. Negative reflectance corresponds to absorption in-phase with the excitation voltage on ITO: ; . Top panel: in-phase EA spectra for diode at 295 K for different biases. Also shown are the absorption spectrum of TFB (dashed line) and polaron absorption spectrum of chemically -doped TFB (black solid line) with , on arbitrary scales. Middle panel: in-phase EA spectra for diode at 30 K for different biases. Bottom panel: (solid lines) in-phase EA spectra for (bottom spectrum in left plot) and (top spectrum in left plot) diodes at 295 K for ; (dots) in-phase EA spectra for corresponding ITO/PEDT:PSSM/polystyrene/Ca metal–insulator–metal structures. The quadrature spectra are zero in all cases.

Image of FIG. 3.
FIG. 3.

Bias dependence of the interface charge density vs plots at 295 and 30 K.

Image of FIG. 4.
FIG. 4.

Variable temperature characteristics of diodes in the log-linear and log-log representation. has been subtracted from the voltage. (a) ITO/PEDT:PSSH/75 nm TFB/Ca. (b) ITO/PEDT:PSSH/75 nm . (c) ITO/PEDT:PSSM(Na,TMA)/75 nm . Data for (b) and (c) are replotted from Ref. 6.

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/content/aip/journal/apl/97/11/10.1063/1.3467469
2010-09-16
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Determination of the interface δ-hole density in a blue-emitting organic semiconductor diode by electromodulated absorption spectroscopy
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/11/10.1063/1.3467469
10.1063/1.3467469
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